[apops] Cisco Security Advisory: Cisco IOS Software Crafted TCP Packet D

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software Crafted TCP Packet Denial of Service Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Mar 2010 12:00:00 -0400
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      Cisco Security Advisory: Cisco IOS Software Crafted TCP Packet Denial
      of Service Vulnerability
      
      Advisory ID: cisco-sa-20100324-tcp
      
      Revision 1.0
      
      For Public Release 2010 March 24 1600 UTC (GMT)
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS Software is affected by a denial of service vulnerability
      that may allow a remote unauthenticated attacker to cause an affected
      device to reload or hang. The vulnerability may be triggered by a TCP
      segment containing crafted TCP options that is received during the
      TCP session establishment phase. In addition to specific, crafted TCP
      options, the device must have a special configuration to be affected
      by this vulnerability.
      
      Cisco has released free software updates that address this
      vulnerability.
      
      This advisory is posted at:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100324-tcp.shtml
      
      Note: The March 24, 2010, Cisco IOS Software Security Advisory
      bundled publication includes seven Security Advisories. All the
      advisories address vulnerabilities in Cisco IOS Software. Each
      advisory lists the releases that correct the vulnerability or
      vulnerabilities detailed in the advisory. The table at the following
      URL lists releases that correct all Cisco IOS Software
      vulnerabilities that have been published on March 24, 2010, or
      earlier:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100324-bundle.shtml
      
      Individual publication links are in "Cisco Event Response: Semiannual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Vulnerable devices are running an affected version of Cisco IOS
      Software, and are configured for any of the following:
      
        * A specific TCP window size
        * TCP path MTU discovery (PMTUD)
        * Stateful Network Address Translation (SNAT) with TCP as the
          transport protocol
      
      Configurations Using a Specific TCP Window Size
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
      Devices configured to use a specific TCP receive window size for
      connections originating on the device are affected by this
      vulnerability. A device configured with a specific TCP receive window
      size has the following command in its configuration:
      
          ip tcp window-size <window size, from 0 to 1073741823>
      
      If the TCP window size has not been explicitly configured with the
      command "ip tcp window-size <window size, from 0 to 1073741823>" then
      the device is not affected by the vulnerability.
      
      Configurations Using Path MTU Discovery
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
      Devices configured to use PMTUD for TCP connections originating or
      terminating on the device are also affected by this vulnerability.
      Different Cisco IOS Software features may allow to enable or disable
      PMTUD on a per-feature basis. The following list contains features
      known to enable PMTUD for TCP connections:
      
        * TCP over IPv4: the "ip tcp path-mtu-discovery" command enables
          PMTUD for all new TCP over IPv4 connections from the device. This
          command is disabled by default.
        * TCP over IPv6: PMTUD is enabled by default for IPV6 and cannot be
          disabled.
        * Border Gateway Protocol (BGP): recent versions of Cisco IOS
          Software (Cisco IOS Release 12.2(33)SRA, 12.2(31)SB, 12.2(33)SXH,
          12.4(20)T and later releases) automatically enable PMTUD for all
          BGP neighbor sessions when BGP is configured. Refer to:
          
          http://www.cisco.com/en/US/docs/ios/12_2sr/12_2sra/feature/guide/srbgpmtu.html
          
          for details.
      
      Other features like generic routing encapsulation (GRE), IP-in-IP
      tunneling, and Layer 2 Tunneling Protocol (L2TP) also allow the use
      of PMTUD. However, these are not related to TCP services and
      therefore are not affected by this vulnerability.
      
      Configurations Using Stateful NAT with TCP as the Transport Protocol
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
      Devices configured to use SNAT are also affected by this
      vulnerability. A device configured to use SNAT with TCP as the
      transport protocol has the following commands in its configuration:
      
          ip nat Stateful id <stateful NAT ID number>
               redundancy <redundancy group name>
                   ...
                   protocol   tcp
          !
      
      Note that to be affected under an SNAT configuration scenario, the
      SNAT transport protocol must be TCP. Recent versions of Cisco IOS
      Software do not support the use of TCP as the SNAT transport protocol
      (they only support UDP), in which case the use of SNAT does not make
      a device vulnerable. SNAT is not enabled by default, and when SNAT is
      configured, the default transport protocol is TCP if the Cisco IOS
      Software release supports TCP as a transport protocol for SNAT.
      
      Determining The Cisco IOS Software Version
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      
      To determine the Cisco IOS Software release that is running on a
      Cisco product, administrators can log in to the device and issue the 
      "show version" command to display the system banner. The system banner
      confirms that the device is running Cisco IOS Software by displaying
      text similar to "Cisco Internetwork Operating System Software" or
      "Cisco IOS Software." The image name is displayed in parentheses,
      followed by "Version" and the Cisco IOS Software release name. Other
      Cisco devices do not have the "show version" command or may provide
      different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 12.3(26) with an installed image name of
      C2500-IS-L:
      
          Router#show version
          Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2008 by cisco Systems, Inc.
          Compiled Mon 17-Mar-08 14:39 by dchih
          
          <output truncated>
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 12.4(20)T with an installed image name of
      C1841-ADVENTERPRISEK9-M:
      
          Router#show version
          Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2008 by Cisco Systems, Inc.
          Compiled Thu 10-Jul-08 20:25 by prod_rel_team
          
          <output truncated>
      
      Additional information about Cisco IOS Software release naming
      conventions is available in "White Paper: Cisco IOS Reference Guide"
      at the following link:
      
      http://www.cisco.com/warp/public/620/1.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS XR Software is not affected.
      
      Cisco IOS XE Software is not affected.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      Cisco IOS Software is affected by a denial of service vulnerability
      that may allow a remote unauthenticated attacker to cause a device
      reload or hang.
      
      The vulnerability may only be triggered by a TCP segment received
      during the TCP session establishment phase. The received TCP segment
      must contain crafted, not malformed, TCP options. A TCP three-way
      handshake does not need to be completed to exploit the vulnerability.
      
      To be affected by this vulnerability, a device must be configured for
      any of the following:
      
        * A specific TCP receive window size
        * PMTUD
        * SNAT with TCP as the transport protocol
      
      Refer to the Affected Products section for additional details on
      these configurations.
      
      The vulnerability exists in the TCP options processing code of Cisco
      IOS Software. When the vulnerability is triggered, Cisco IOS Software
      enters an infinite loop that may cause the device to reload or hang.
      The following syslog messages may indicate that this vulnerability
      has been exploited:
      
          %SYS-3-CPUHOG: Task is running for (128004)msecs, more than (2000)msecs (23/1),process = IP Input.
          -Traceback= 0x41CA6AC4 0x41C83170 0x41A22704 0x41F249D4 0x41A24A34 0x41B24C58 
          %SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = IP Input.
      
      This vulnerability is addressed by Cisco bug ID CSCsz75186 and has been
      assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2010-0577.
      
      BGP Considerations
      ~~~~~~~~~~~~~~~~~~
      
      This vulnerability could be exploited through the BGP port (TCP port
      179) if all the following conditions are met:
      
        * The device is configured for one or more of the features that
          make a device affected, as explained above. Note that in recent
          versions of Cisco IOS Software, configuring BGP automatically
          enables PMTUD for all BGP neighbor sessions.
        * The source IP address of an attack packet is the IP address of a
          configured BGP peer.
        * If the BGP TTL Security Hack (BTSH)/Generalized TTL Security
          Mechanism (GTSM) is configured, the TTL of the received attack
          packet is within the allowed TTL range.
        * If the BGP peering session is protected by the TCP MD5 option,
          the attack packet has the correct MD5 hash.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has provided scores for the vulnerability in this advisory
      based on the Common Vulnerability Scoring System (CVSS). The CVSS
      scoring in this Security Advisory is done in accordance with CVSS
      version 2.0.
      
      CVSS is a standards-based scoring method that conveys vulnerability
      severity and helps determine urgency and priority of response.
      
      Cisco has provided a base and temporal score. Customers can then
      compute environmental scores to assist in determining the impact of
      the vulnerability in individual networks.
      
      Cisco has provided an FAQ to answer additional questions regarding
      CVSS at:
      
      http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
      
      Cisco has also provided a CVSS calculator to help compute the
      environmental impact for individual networks at:
      
      http://intellishield.cisco.com/security/alertmanager/cvss
      
      CSCsz75186 - TCP crash by watchdog timeout due to crafted TCP segment
      
      CVSS Base Score - 7.1
      
      Access Vector           - Network
      Access Complexity       - Medium
      Authentication          - None
      Confidentiality Impact  - None
      Integrity Impact        - None
      Availability Impact     - Complete
      
      CVSS Temporal Score - 5.9
      
      Exploitability          - Functional
      Remediation Level       - Official-Fix
      Report Confidence       - Confirmed
      
      Impact
      ======
      
      Successful exploitation of the vulnerability may cause the affected
      device to reload or hang. Repeated exploitation could result in a
      sustained denial of service condition. In the case of a hang, cycling
      power to the device may be required to put the device back in
      service.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, also consult
      http://www.cisco.com/go/psirt and any subsequent advisories to
      determine exposure and a complete upgrade solution.
      
      In all cases, customers should exercise caution to be certain the
      devices to be upgraded contain sufficient memory and that current
      hardware and software configurations will continue to be supported
      properly by the new release. If the information is not clear, contact
      the Cisco Technical Assistance Center (TAC) or your contracted
      maintenance provider for assistance.
      
      Each row of the Cisco IOS software table (below) names a Cisco IOS
      release train. If a given release train is vulnerable, then the
      earliest possible releases that contain the fix (along with the
      anticipated date of availability for each, if applicable) are listed
      in the "First Fixed Release for this Advisory" column of the table.
      The "First Fixed Release for all Advisories in 24 March 2010 Bundle
      Publication" column indicates the earliest possible releases which
      have fixes for all the published vulnerabilities in this Cisco IOS
      Security Advisory bundled publication. Cisco recommends upgrading to
      the latest available release where possible.
      
      +-------------------------------------------------------------------+
      |   Major    |             Availability of Repaired Releases        |
      |  Release   |                                                      |
      |------------+------------------------------------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 12.0-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |-------------------------------------------------------------------|
      | There are no affected 12.0 based releases                         |
      |-------------------------------------------------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 12.1-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |-------------------------------------------------------------------|
      | There are no affected 12.1 based releases                         |
      |-------------------------------------------------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 12.2-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |------------+---------------------------+--------------------------|
      | 12.2       | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2B      | fixed 12.4 release.       | any release in 15.0M or  |
      |            | Releases up to and        | a fixed 12.4 release.    |
      |            | including 12.2(4)B8 are   |                          |
      |            | not vulnerable.           |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2BC     | fixed 12.4 release.       | any release in 15.0M or  |
      |            | Releases up to and        | a fixed 12.4 release.    |
      |            | including 12.2(4)BC1b are |                          |
      |            | not vulnerable.           |                          |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2BW     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; first fixed   |                          |
      |            | in 12.4                   | Vulnerable; migrate to   |
      | 12.2BX     |                           | any release in 15.0M or  |
      |            | Releases up to and        | a fixed 12.4 release.    |
      |            | including 12.2(2)BX1 are  |                          |
      |            | not vulnerable.           |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2BY     | fixed 12.4                | any release in 15.0M or  |
      |            | release.Releases up to    | a fixed 12.4 release.    |
      |            | and including 12.2(2)BY3  |                          |
      |            | are not vulnerable.       |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2BZ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2CX     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2CY     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.2CZ     | Vulnerable; migrate to    | Vulnerable; migrate to   |
      |            | any release in 12.2S      | any release in 12.2SRE   |
      |------------+---------------------------+--------------------------|
      | 12.2DA     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2DD     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2DX     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.2EW     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2EWA    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases up to and       |
      |            |                           | including 12.2(37)EX are |
      |            |                           | not vulnerable.          |
      | 12.2EX     | Not Vulnerable            |                          |
      |            |                           | Releases 12.2(44)EX and  |
      |            |                           | later are not            |
      |            |                           | vulnerable; first fixed  |
      |            |                           | in 12.2SE                |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases prior to 12.2   |
      | 12.2EY     | Not Vulnerable            | (37)EY are vulnerable,   |
      |            |                           | release 12.2(37)EY and   |
      |            |                           | later are not vulnerable |
      |------------+---------------------------+--------------------------|
      | 12.2EZ     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2FX     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2FY     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2FZ     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2IRA    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SRC               |
      |------------+---------------------------+--------------------------|
      | 12.2IRB    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SRC               |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IRC    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IRD    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXA    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXB    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXC    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXD    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXE    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXF    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXG    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2IXH    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Releases up to and        | Releases up to and       |
      | 12.2JA     | including 12.2(4)JA1 are  | including 12.2(4)JA1 are |
      |            | not vulnerable.           | not vulnerable.          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2JK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.2MB     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; first fixed  |
      | 12.2MC     | any release in 15.0M or a | in 12.4                  |
      |            | fixed 12.4 release.       |                          |
      |------------+---------------------------+--------------------------|
      | 12.2MRA    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases prior to 12.2   |
      |            |                           | (30)S are vulnerable,    |
      | 12.2S      | Not Vulnerable            | release 12.2(30)S and    |
      |            |                           | later are not            |
      |            |                           | vulnerable;              |
      |------------+---------------------------+--------------------------|
      |            |                           | 12.2(33)SB8              |
      | 12.2SB     | Not Vulnerable            |                          |
      |            |                           | 12.2(31)SB18; Available  |
      |            |                           | on 24-MAR-10             |
      |------------+---------------------------+--------------------------|
      | 12.2SBC    | Not Vulnerable            | Vulnerable; migrate to   |
      |            |                           | any release in 12.2SRE   |
      |------------+---------------------------+--------------------------|
      | 12.2SCA    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SCB               |
      |------------+---------------------------+--------------------------|
      | 12.2SCB    | Not Vulnerable            | 12.2(33)SCB6             |
      |------------+---------------------------+--------------------------|
      | 12.2SCC    | Not Vulnerable            | 12.2(33)SCC1             |
      |------------+---------------------------+--------------------------|
      | 12.2SCD    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SE     | Not Vulnerable            | 12.2(50)SE4; Available   |
      |            |                           | on 25-MAR-10             |
      |------------+---------------------------+--------------------------|
      | 12.2SEA    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SEB    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SEC    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SED    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SE                |
      |------------+---------------------------+--------------------------|
      | 12.2SEE    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SE                |
      |------------+---------------------------+--------------------------|
      | 12.2SEF    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases prior to 12.2   |
      |            |                           | (25)SEG4 are vulnerable, |
      | 12.2SEG    | Not Vulnerable            | release 12.2(25)SEG4 and |
      |            |                           | later are not            |
      |            |                           | vulnerable; first fixed  |
      |            |                           | in 12.2SE                |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases up to 12.2(31)  |
      |            |                           | SG1 are not vulnerable;  |
      | 12.2SG     | Not Vulnerable            | releases 12.2(40)SG and  |
      |            |                           | later are not            |
      |            |                           | vulnerable.              |
      |------------+---------------------------+--------------------------|
      | 12.2SGA    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SL     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SM     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2SO     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2SQ     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2SRA    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SRD               |
      |------------+---------------------------+--------------------------|
      | 12.2SRB    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SRD               |
      |------------+---------------------------+--------------------------|
      | 12.2SRC    | Not Vulnerable            | 12.2(33)SRC5             |
      |------------+---------------------------+--------------------------|
      | 12.2SRD    | Not Vulnerable            | 12.2(33)SRD3             |
      |------------+---------------------------+--------------------------|
      | 12.2SRE    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      | 12.2STE    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2SU     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases up to and       |
      | 12.2SV     | Not Vulnerable            | including 12.2(18)SV2    |
      |            |                           | are not vulnerable.      |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2SVA    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2SVC    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2SVD    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2SVE    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases up to and       |
      |            |                           | including 12.2(25)SW3    |
      |            |                           | are not vulnerable.      |
      | 12.2SW     | Not Vulnerable            |                          |
      |            |                           | Releases 12.2(25)SW12    |
      |            |                           | and later are not        |
      |            |                           | vulnerable; first fixed  |
      |            |                           | in 15.0M                 |
      |------------+---------------------------+--------------------------|
      | 12.2SX     | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      | 12.2SXA    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      | 12.2SXB    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      | 12.2SXD    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      | 12.2SXE    | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      | 12.2SXF    | Not Vulnerable            | 12.2(18)SXF17a           |
      |------------+---------------------------+--------------------------|
      | 12.2SXH    | Not Vulnerable            | 12.2(33)SXH6             |
      |------------+---------------------------+--------------------------|
      |            |                           | 12.2(33)SXI2a            |
      | 12.2SXI    | Not Vulnerable            |                          |
      |            |                           | 12.2(33)SXI3             |
      |------------+---------------------------+--------------------------|
      | 12.2SY     | Not Vulnerable            | Vulnerable; migrate to   |
      |            |                           | any release in 12.2SRE   |
      |------------+---------------------------+--------------------------|
      | 12.2SZ     | Not Vulnerable            | Vulnerable; migrate to   |
      |            |                           | any release in 12.2SRE   |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2T      | fixed 12.4                | any release in 15.0M or  |
      |            | release.Releases up to    | a fixed 12.4 release.    |
      |            | and including 12.2(4)T7   |                          |
      |            | are not vulnerable.       |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2TPC    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XA     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XB     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XC     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XD     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.2XE     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XF     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XG     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XH     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XI     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2XJ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2XK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2XL     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2XM     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Releases prior to 12.2   |
      |            |                           | (33)XN1 are vulnerable,  |
      | 12.2XN     | Not Vulnerable            | release 12.2(33)XN1 and  |
      |            |                           | later are not            |
      |            |                           | vulnerable; first fixed  |
      |            |                           | in 12.2SRC               |
      |------------+---------------------------+--------------------------|
      | 12.2XNA    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XNB    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XNC    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XND    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XNE    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XNF    | Please see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software Availability     | Software Availability    |
      |------------+---------------------------+--------------------------|
      | 12.2XO     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XQ     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2XR     | fixed 12.4                | any release in 15.0M or  |
      |            | release.Releases up to    | a fixed 12.4 release.    |
      |            | and including 12.2(4)XR   |                          |
      |            | are not vulnerable.       |                          |
      |------------+---------------------------+--------------------------|
      | 12.2XS     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XT     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XU     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; migrate to   |
      | 12.2XV     | Not Vulnerable            | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2XW     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2YA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YB     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2YC     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YD     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2YE     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YF     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YG     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YH     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YJ     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2YK     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YL     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2YM     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YN     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2YO     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    |                          |
      |            | any release in 15.0M or a | Vulnerable; migrate to   |
      | 12.2YP     | fixed 12.4                | any release in 15.0M or  |
      |            | release.Releases up to    | a fixed 12.4 release.    |
      |            | and including 12.2(8)YP   |                          |
      |            | are not vulnerable.       |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YQ     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YR     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2YS     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YT     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YU     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YV     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YW     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2YX     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2YY     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2YZ     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2ZA     | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXF               |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZB     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZC     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZD     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2ZE     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2ZF     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2ZG     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.2ZH     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZJ     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZL     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.2ZP     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.2ZU     | Not Vulnerable            | Vulnerable; first fixed  |
      |            |                           | in 12.2SXH               |
      |------------+---------------------------+--------------------------|
      | 12.2ZX     | Not Vulnerable            | Vulnerable; migrate to   |
      |            |                           | any release in 12.2SRE   |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2ZY     | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.2ZYA    | Not Vulnerable            | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 12.3-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3       | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3B      | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.3BC     | Vulnerable; migrate to    | Vulnerable; first fixed  |
      |            | any release in 12.2SCB    | in 12.2SCB               |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3BW     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.3EU     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Releases prior to 12.3   |
      |            | support organization per  | (11)JA5 are vulnerable,  |
      | 12.3JA     | the instructions in       | release 12.3(11)JA5 and  |
      |            | Obtaining Fixed Software  | later are not vulnerable |
      |            | section of this advisory  |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Releases prior to 12.3   |
      |            | support organization per  | (8)JEA4 are vulnerable,  |
      | 12.3JEA    | the instructions in       | release 12.3(8)JEA4 and  |
      |            | Obtaining Fixed Software  | later are not vulnerable |
      |            | section of this advisory  |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Releases prior to 12.3   |
      |            | support organization per  | (8)JEB2 are vulnerable,  |
      | 12.3JEB    | the instructions in       | release 12.3(8)JEB2 and  |
      |            | Obtaining Fixed Software  | later are not vulnerable |
      |            | section of this advisory  |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3JEC    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3JED    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3JK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3JL     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3JX     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3T      | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3TPC    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.3VA     | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3XB     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XC     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XD     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; first fixed  |
      |            | Vulnerable; migrate to    | in 12.4                  |
      | 12.3XE     | any release in 15.0M or a |                          |
      |            | fixed 12.4 release.       | Vulnerable; migrate to   |
      |            |                           | any release in 15.0M or  |
      |            |                           | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3XF     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XG     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Note: Releases prior to   | Releases prior to 12.3   |
      |            | 12.3(7)XI11 are           | (7)XI11 are vulnerable,  |
      | 12.3XI     | vulnerable, release 12.3  | release 12.3(7)XI11 and  |
      |            | (7)XI11 and later are not | later are not vulnerable |
      |            | vulnerable;               |                          |
      |------------+---------------------------+--------------------------|
      | 12.3XJ     | Vulnerable; first fixed   | Vulnerable; first fixed  |
      |            | in 12.4XR                 | in 12.4XR                |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XL     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XQ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XR     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XS     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XU     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.3XW     | Vulnerable; first fixed   | Vulnerable; first fixed  |
      |            | in 12.4XR                 | in 12.4XR                |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XX     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XY     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3XZ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4 release.       | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YD     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.3YF     | Vulnerable; first fixed   | Vulnerable; first fixed  |
      |            | in 12.4XR                 | in 12.4XR                |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YG     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YH     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YI     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YJ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YM     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YQ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YS     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YT     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3YU     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.3YX     | Vulnerable; first fixed   | Vulnerable; first fixed  |
      |            | in 12.4XR                 | in 12.4XR                |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.3YZ     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.3ZA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 12.4-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |------------+---------------------------+--------------------------|
      |            | 12.4(25c)                 |                          |
      |            |                           | 12.4(25c)                |
      | 12.4       | 15.0(1)M1                 |                          |
      |            |                           | 15.0(1)M1                |
      |            | 15.0(1)M2 ; Available on  |                          |
      |            | 26-MAR-10                 |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4GC     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JA     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JDA    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JDC    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | 12.4(10b)JDD1             |                          |
      |            |                           |                          |
      |            | Vulnerable; Contact your  |                          |
      | 12.4JDD    | support organization per  | 12.4(10b)JDD1            |
      |            | the instructions in       |                          |
      |            | Obtaining Fixed Software  |                          |
      |            | section of this advisory  |                          |
      |------------+---------------------------+--------------------------|
      | 12.4JHA    | Not Vulnerable            | Not Vulnerable           |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JK     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JL     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Releases prior to 12.4   |
      |            | support organization per  | (3g)JMA2 are vulnerable, |
      | 12.4JMA    | the instructions in       | release 12.4(3g)JMA2 and |
      |            | Obtaining Fixed Software  | later are not vulnerable |
      |            | section of this advisory  |                          |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4JMB    | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      | 12.4JX     | Vulnerable; first fixed   | Vulnerable; first fixed  |
      |            | in 12.4JA                 | in 12.4JA                |
      |------------+---------------------------+--------------------------|
      |            | 12.4(11)MD10              |                          |
      | 12.4MD     |                           | 12.4(24)MD               |
      |            | 12.4(15)MD4 12.4(24)MD    |                          |
      |------------+---------------------------+--------------------------|
      | 12.4MDA    | 12.4(22)MDA2              | 12.4(22)MDA2             |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4MR     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4SW     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | 12.4(22)T3                | 12.4(15)T12              |
      |            |                           |                          |
      |            | 12.4(20)T4                | 12.4(20)T5               |
      | 12.4T      |                           |                          |
      |            | 12.4(15)T10               | 12.4(24)T3; Available on |
      |            |                           | 26-MAR-10                |
      |            | 12.4(24)T2                |                          |
      |            |                           | 12.4(22)T4               |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XB     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XC     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XD     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XE     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XF     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XG     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XJ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XK     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4XL     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XM     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4XN     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4XP     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XQ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      | 12.4XR     | 12.4(22)XR3               | 12.4(22)XR3              |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XT     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4XV     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XW     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XY     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4XZ     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; migrate to    | Vulnerable; migrate to   |
      | 12.4YA     | any release in 15.0M or a | any release in 15.0M or  |
      |            | fixed 12.4T release.      | a fixed 12.4 release.    |
      |------------+---------------------------+--------------------------|
      |            |                           | Vulnerable; Contact your |
      |            |                           | support organization per |
      | 12.4YB     | 12.4(22)YB5               | the instructions in      |
      |            |                           | Obtaining Fixed Software |
      |            |                           | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4YD     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |            | 12.4(22)YE2               | 12.4(22)YE2              |
      | 12.4YE     |                           |                          |
      |            | 12.4(24)YE                | 12.4(24)YE               |
      |------------+---------------------------+--------------------------|
      |            | Vulnerable; Contact your  | Vulnerable; Contact your |
      |            | support organization per  | support organization per |
      | 12.4YG     | the instructions in       | the instructions in      |
      |            | Obtaining Fixed Software  | Obtaining Fixed Software |
      |            | section of this advisory  | section of this advisory |
      |------------+---------------------------+--------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 15.0-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |-------------------------------------------------------------------|
      | There are no affected 15.0 based releases                         |
      |-------------------------------------------------------------------|
      |  Affected  |                           | First Fixed Release for  |
      | 15.1-Based |  First Fixed Release for  |   all Advisories in 24   |
      |  Releases  |       this Advisory       |    March 2010 Bundle     |
      |            |                           |       Publication        |
      |-------------------------------------------------------------------|
      | There are no affected 15.1 based releases                         |
      +-------------------------------------------------------------------+
      
      Cisco IOS-XE Software
      +--------------------
      
      +-------------------------------------------------------------------+
      |       IOS-XE Release       |         First Fixed Release          |
      |----------------------------+--------------------------------------|
      | 2.1.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.2.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.3.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.4.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.5.x                      | Not Vulnerable                       |
      |----------------------------+--------------------------------------|
      | 2.6.x                      | Not Vulnerable                       |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      There are no workarounds to mitigate this vulnerability other than
      disabling the specific features that make a device vulnerable, if
      feasible.
      
      Additionally, allowing only legitimate devices to connect to affected
      devices will help limit exposure to this vulnerability. Refer to the 
      Control Plane Policing and Configuring Infrastructure Access Lists
      (iACLs) subsections below for further details. Since a TCP three-way
      handshake is not required, to increase effectiveness, the mitigation
      must be coupled with anti-spoofing measures on the network edge.
      
      Specific mitigations for BGP are discussed below in the BGP
      Considerations subsection.
      
      Additional mitigations that can be deployed on Cisco devices within
      the network are available in the companion document "Cisco Applied
      Mitigation Bulletin: Identifying and Mitigating Exploitation of the
      Cisco IOS Software Crafted TCP Packet Denial of Service
      Vulnerability", which is available at the following location:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20100324-tcp.shtml
      
      Configurations Using a Specific TCP Window Size
      +----------------------------------------------
      
      Not setting a specific TCP receive window size can be accomplished by
      removing the "ip tcp window-size" command from the configuration.
      
      Configurations Using Path MTU Discovery
      +--------------------------------------
      
      PMTUD may be disabled in some of the Cisco IOS Software features that
      make use of PMTUD. The specific command to use to disable PMTUD
      varies depending on the specific feature:
      
        * TCP over IPv4: removing the "ip tcp path-mtu-discovery" command
          from the configuration will disable PMTUD for TCP over IPv4
          sessions that originate on the device.
        * TCP over IPv6: PMTUD is enabled by default for IPV6 and cannot be
          disabled.
        * BGP: if BGP is configured on a recent version of Cisco IOS
          Software that enables PMTUD for BGP sessions, PMTUD can be
          disabled for all BGP sessions with the "no bgp transport
          path-mtu-discovery" command in router configuration mode (Cisco
          IOS Release 12.2(33)SRA, 12.2(31)SB, 12.2(33)SXH, 12.4(20)T, and
          later releases).
      
      Configurations Using Stateful NAT with TCP as the Transport Protocol
      +-------------------------------------------------------------------
      
      SNAT can be disabled by removing the "ip nat Stateful id" command from
      the configuration.
      
      Control Plane Policing
      +---------------------
      
      For devices that need to offer TCP services, it is possible to use
      Control Plane Policing (CoPP) to block TCP traffic to the device from
      untrusted sources. Cisco IOS Releases 12.0S, 12.2SX, 12.2S, 12.3T,
      12.4, and 12.4T support the CoPP feature. CoPP may be configured on a
      device to protect the management and control planes to minimize the
      risk and effectiveness of direct infrastructure attacks by explicitly
      permitting only authorized traffic sent to infrastructure devices in
      accordance with existing security policies and configurations. The
      following example can be adapted to specific network configurations:
          
          !-- The 192.168.1.0/24 network and the 172.16.1.1 host are trusted.
          !-- Everything else is not trusted. The following access list is used
          !-- to determine what traffic needs to be dropped by a control plane
          !-- policy (the CoPP feature.) If the access list matches (permit)
          !-- then traffic will be dropped and if the access list does not
          !-- match (deny) then traffic will be processed by the router.
          !-- Note that TCP ports 22 and 23 are just examples; this configuration
          !-- needs to be expanded to include all used TCP ports.
          
          access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 22
          access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 23
          access-list 100 deny tcp host 172.16.1.1 any eq 22
          access-list 100 deny tcp host 172.16.1.1 any eq 23
          access-list 100 permit tcp any any
          
          !-- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4
          !-- traffic in accordance with existing security policies and
          !-- configurations for traffic that is authorized to be sent
          !-- to infrastructure devices.
          !-- Create a Class-Map for traffic to be policed by
          !-- the CoPP feature.
          
          class-map match-all drop-tcp-class
            match access-group 100
          
          !-- Create a Policy-Map that will be applied to the
          !-- Control-Plane of the device, and add the "drop-tcp-traffic"
          !-- class map.
          
          policy-map control-plane-policy
           class drop-tcp-class
            drop
          
          !-- Apply the Policy-Map to the Control-Plane of the
          !-- device.
          
          control-plane
           service-policy input control-plane-policy
      
      Warning: Because a TCP three-way handshake is not required to
      exploit this vulnerability, it is possible to easily spoof the IP
      address of the sender, which may defeat access control lists (ACLs)
      that permit communication to these ports from trusted IP addresses.
      
      In the above CoPP example, the access control entries (ACEs) that
      match the potential exploit packets with the "permit" action result
      in these packets being discarded by the policy-map "drop" function,
      while packets that match the "deny" action (not shown) are not
      affected by the policy-map drop function. Additional information on
      the configuration and use of the CoPP feature can be found at:
      
      http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html
      
      http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html
      
      Configuring Infrastructure Access Lists (iACLs)
      +----------------------------------------------
      
      Although it is often difficult to block traffic transiting your
      network, it is possible to identify traffic that should never be
      allowed to target your infrastructure devices and block that traffic
      at the border of your network. Infrastructure ACLs are considered a
      network security best practice and should be considered as a
      long-term addition to good network security as well as a workaround
      for this specific vulnerability. The white paper entitled "Protecting
      Your Core: Infrastructure Protection Access Control Lists" presents
      guidelines and recommended deployment techniques for infrastructure
      protection ACLs:
      
      http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801afc76.shtml
      
      BGP Considerations
      +-----------------
      
      BTSH/GTSM can help prevent exploitation of this vulnerability via the
      BGP port because packets coming from devices that do not pass the TTL
      check configured via BTSH are dropped before any TCP processing takes
      place. For information on BTSH refer to:
      
      http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/gt_btsh.html
      
      MD5 authentication for BGP peering sessions can also help prevent
      exploitation via the BGP port because the MD5 hash in an attack
      packet is checked before processing the crafted TCP option. For a
      detailed discussion on how to configure BGP, refer to the following
      document:
      
      http://www.cisco.com/en/US/docs/ios/12_0/np1/configuration/guide/1cbgp.html
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address these
      vulnerabilities. Prior to deploying software, customers should
      consult their maintenance provider or check the software for feature
      set compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature sets
      they have purchased. By installing, downloading, accessing or
      otherwise using such software upgrades, customers agree to be bound
      by the terms of Cisco's software license terms found at:
      
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
      
      or as otherwise set forth at Cisco.com Downloads at:
      
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml
      
      Do not contact psirt at cisco dot com or security-alert at cisco dot com for
      software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com.
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreements with third-party support organizations,
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of entitlement to
      a free upgrade. Free upgrades for non-contract customers must be
      requested through the TAC.
      
      Refer to:
      
      http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
      
      for additional TAC contact information, including localized telephone
      numbers, and instructions and e-mail addresses for use in various
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerability described in this advisory.
      
      This vulnerability was discovered during the resolution of customer
      service requests.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
      KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
      INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
      AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
      DOCUMENT AT ANY TIME.
      
      A stand-alone copy or Paraphrase of the text of this document that
      omits the distribution URL in the following section is an
      uncontrolled copy, and may lack important information or contain
      factual errors.
      
      Distribution
      ============
      
      This advisory is posted on Cisco's worldwide website at:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20100324-tcp.shtml
      
      In addition to worldwide web posting, a text version of this notice
      is clear-signed with the Cisco PSIRT PGP key and is posted to the
      following e-mail and Usenet news recipients.
      
        * cust-security-announce at cisco dot com
        * first-bulletins at lists dot first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot com
      
      Future updates of this advisory, if any, will be placed on Cisco's
      worldwide website, but may or may not be actively announced on
      mailing lists or newsgroups. Users concerned about this problem are
      encouraged to check the above URL for any updates.
      
      Revision History
      ================
      
      +-------------------------------------------------------------------+
      | Revision 1.0    | 2010-March-24    | Initial public release       |
      +-------------------------------------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and
      registering to receive security information from Cisco, is available
      on Cisco's worldwide website at:
      
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
      
      This includes instructions for press inquiries regarding Cisco security
      notices. All Cisco security advisories are available at:
      
      http://www.cisco.com/go/psirt
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