[apops] Cisco Security Advisory: Cisco IOS User Datagram Protocol Delive

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS User Datagram Protocol Delivery Issue For IPv4/IPv6 Dual-stack Routers
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 26 Mar 2008 17:00:00 +0100
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      Cisco Security Advisory: Cisco IOS User Datagram Protocol Delivery
                               Issue For IPv4/IPv6 Dual-stack Routers
      
      Advisory ID: cisco-sa-20080326-IPv4IPv6
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
      
      Revision 1.0
      
      For Public Release 2008 March 26 1600 UTC (GMT)
      
      Summary
      =======
      
      A device running Cisco IOS software that has Internet Protocol
      version 6 (IPv6) enabled may be subject to a denial of service (DoS)
      attack. For the device to be affected by this vulnerability the
      device also has to have certain Internet Protocol version 4 (IPv4)
      User Datagram Protocol (UDP) services enabled. To exploit this
      vulnerability an offending IPv6 packet must be targeted to the
      device. Packets that are routed throughout the router can not trigger
      this vulnerability. Successful exploitation will prevent the
      interface from receiving any additional traffic. The only exception
      is Resource Reservation Protocol (RSVP) service, which if exploited,
      will cause the device to crash. Only the interface on which the
      vulnerability was exploited will be affected.
      
      Cisco is providing fixed software to address this issue. There are
      workarounds available to mitigate the effects of the vulnerability.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
      
      Note: The March 26, 2008 publication includes five Security
      Advisories. The Advisories all affect Cisco's Internetwork Operating
      System (IOS). Each Advisory lists the releases that correct the
      vulnerability described in the Advisory, and the Advisories also
      detail the releases that correct the vulnerabilities in all five
      Advisories. Please reference the following software table to find a
      release which fixes all published Security Advisories as of March
      26th, 2008.
      
        * March 26th bundled IOS Advisory Table
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-bundle.shtml
      
      Individual publication links are listed below:
      
        * Cisco IOS Virtual Private Dial-up Network Denial of Service
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
      
        * Multiple DLSw Denial of Service Vulnerabilities in Cisco IOS
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
      
        * Cisco IOS User Datagram Protocol Delivery Issue For IPv4/IPv6
          Dual-stack Routers
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
      
        * Vulnerability in Cisco IOS with OSPF, MPLS VPN, and Supervisor
          32, Supervisor 720, or Route Switch Processor 720
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-queue.shtml
      
        * Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Only Cisco IOS software releases that have IPv6 enabled are affected
      by this vulnerability. In order to be vulnerable both support for
      IPv6 protocol and IPv4 UDP-based services must be enabled on the
      device. The IPv6 is not enabled by default in Cisco IOS software.
      
      To determine the software running on a Cisco IOS product, log in to
      the device and issue the show version command to display the system
      banner. Cisco IOS software will identify itself as "Internetwork
      Operating System Software" or simply "IOS." On the next line of
      output, the image name will be displayed between parentheses,
      followed by "Version" and the Cisco IOS software release name. Other
      Cisco devices will not have the show version command, or will give
      different output.
      
      The following example shows output from a device running a Cisco IOS
      image:
      
          Router>show version
          Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 12.4(15)T2, RELEASE SOFTWARE (fc7) 
          Technical Support: http://www.cisco.com/techsupport 
          Copyright (c) 1986-2008 by Cisco Systems, Inc. 
          Compiled Thu 17-Jan-08 23:12 by prod_rel_team
      
      Additional information about Cisco IOS software release naming is
      available at the following link:
      http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml.
      
      In order for an interface to be vulnerable two conditions must be
      satisfied:
      
       1. An interface must have IPv6 enabled.
       2. One or more of the following IPv4 UDP-based services must be
          enabled:
          TACACS - port 49
          Domain Name System (DNS) server - port 53
          Resource Reservation Protocol (RSVP) - port 1698
          Layer Two Forwarding (L2F)/Layer Two Tunnel Protocol (L2TP) -
          port 1701
          IP SLA Responder - port 1967
          Media Gateway Control Protocol (MGCP) - port 2427
          Session Initiation Protocol (SIP) - port 5060
      
      No other IPv4 UDP-based services are known to be affected.
      
      How To Verify If IPv6 Is Enabled
      +-------------------------------
      
      IPv6 protocol is enabled on an interface if either or both of the
      following configuration lines are present in the configuration:
      
          Router#show running-config
          interface FastEthernet0/1
           ipv6 address 2001:0DB8:C18:1::/64 eui-64
      
          Router#show running-config
          interface FastEthernet0/1
           ipv6 enabled
      
      If any of the interfaces contain either or both of the ipv6 lines
      then IPv6 is enabled on that particular interface.
      
      How To Verify If IPv4 UDP-based Services Are Enabled
      +---------------------------------------------------
      
      To determine whether device is affected or not, use the show ip
      sockets command to display all UDP ports device is listening to. In
      some newer IOS releases the command show ip sockets is obsoleted, and
      the alternate command show udp can be used instead. The output is
      identical to the show ip sockets command.
      
      The device is vulnerable if the Local Port column (fifth from the
      left) in the output of show ip sockets contains any of the port
      numbers listed in the example below.
      
          Router#show ip sockets
          Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
          17 192.168.100.1      49 192.168.100.2       49   0   0   11   0 
          17 0.0.0.0             0 192.168.100.2       53   0   0  211   0 
          17   --listen--          192.168.100.2     1698   0   0    1   0 
          17 192.168.100.1    1701 192.168.100.2     1701   1   0 1021   0
          17 0.0.0.0             0 192.168.100.2     1967   0   0  211   0 
          17 0.0.0.0             0  --any--          2427   0   0  211   0
          17 0.0.0.0             0  --any--          5060   0   0  211   0
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Any device running Cisco IOS without IPv6 enabled is not vulnerable.
      Cisco IOS XR and Cisco PIX/ASA are not affected.
      
      Details
      =======
      
      To exploit this vulnerability an offending IPv6 packet must be
      targeted to the device. Packets that are routed throughout the router
      can not trigger this vulnerability. Successful exploitation of the
      vulnerability may result in one of the following two conditions:
      
       1. The device will crash if RSVP service is configured on the
          interface.
       2. Any other affected IPv4 UDP-based service will prevent the
          interface from receiving additional traffic. Only the interface
          on which the vulnerability is exploited will be affected.
      
      This vulnerability is independent of the interface media type. A
      blocked interface will immediately stop receiving any subsequent
      packets destined to the device itself until it is unblocked. It is
      possible to unblock the interface using methods other than a device
      reload. These methods are described in the Workarounds section. All
      other interfaces are unaffected and will continue receiving and
      transmitting packets.
      
      Blocked interface may allow transit traffic to flow for a period of
      time. Transit traffic may continue to flow until either the
      respective routing entry or Address Resolution Protocol (ARP) entry
      expires, whichever event occurs first. Depending on the circumstances
      the transit traffic can stop flowing through the blocked interface
      within a few seconds or continue up to four hours (which is the ARP
      cache default lifetime). After that no further transit traffic will
      flow through the blocked interface.
      
      No other IPv4 UDP-based services are known to be affected by this
      vulnerability.
      
      This vulnerability is documented in Cisco Bug ID CSCse56501, and has
      been assigned the Common Vulnerabilities and Exposures (CVE) ID
      CVE-2008-1153.
      
      Identification Of Vulnerability Exploitation
      +-------------------------------------------
      
      The show interfaces command can be used to view the input queue size
      to identify a blocked input interface. A device under attack, but not
      yet blocked will show the Input queue size increasing without a
      subsequent decrease. If the current size (in this case, 76) is larger
      than the maximum size (75), the input queue is blocked. The value of
      75 is the default value and it can be changed using the interface
      command hold-queue X in .
      
          Router#show interfaces FastEthernet 0/1 | include queue
            Input queue: 76/75/0/0 (size/max/drops/flushes); Total output drops: 0
            Output queue: 0/40 (size/max)
      
      The example above shows that the interface FastEthernet0/1 is
      blocked.
      
      The show ip sockets command can be used to determine which protocol
      blocks the interface. If In column (sixth from the left) of the
      output contains any other number than zero (0) that is an indication
      that packets of that particular protocol are blocking, or starting to
      block, the interface. The following example shows DNS packets that
      are beginning to fill the input queue of the interface. The interface
      is not completely blocked because only 13 packets are in the input
      queue.
      
          Router#show ip sockets
          Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
          17 192.168.100.1      49 192.168.100.2       49   0   0   11   0 
          17 0.0.0.0             0 192.168.100.2       53  13   0  211   0 
          17   --listen--          192.168.100.2     1698   0   0    1   0 
          17 192.168.100.1    1701 192.168.100.2     1701   1   0 1021   0
          17 0.0.0.0             0 192.168.100.2     1967   0   0  211   0 
          17 0.0.0.0             0  --any--          2427   0   0  211   0
          17 0.0.0.0             0  --any--          5060   0   0  211   0
      
      The output of the show ip sockets command does not provide
      information on interfaces. It is possible that packets from multiple
      protocols may be blocking a single interface. The output of the
      command must be interpreted with the device's configuration to
      establish the affected port.
      
      Additional methods that can be used to detect blocked interfaces are
      described in "Cisco Applied Mitigation Bulletin: User Datagram
      Protocol Delivery Issue For IPv4/IPv6 Dual-Stack Routers" document
      available at 
      http://www.cisco.com/warp/public/707/cisco-amb-20080326-IPv4IPv6.shtml. 
      The method utilizes Embedded Event Manager (EEM) and Applets or an 
      EEM Script.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has provided scores for the vulnerabilities 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
      
      CSCse56501 - UDP delivery issue when IPv4 and IPv6 are bound to the
                   same socket
      
        CVSS Base Score - 7.8
      
        Access Vector            - Network
        Access Complexity        - Low
        Authentication           - None
        Confidentiality Impact   - None
        Integrity Impact         - None
        Availability Impact      - Complete
      
        CVSS Temporal Score - 6.4
      
        Exploitability           - Functional
        Remediation Level        - Official-Fix
        Report Confidence        - Confirmed
      
      Impact
      ======
      
      Successful exploitation of the vulnerability can result in one of the
      following two conditions:
      
       1. The device will crash if RSVP service is configured on the
          interface.
       2. Any other affected IPv4 UDP-based service will prevent the
          interface from receiving additional traffic. Only the interface
          on which the vulnerability is exploited will be affected.
      
      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" column of the table. The "Recommended
      Release" column indicates the releases which have fixes for all the
      published vulnerabilities at the time of this Advisory. A device
      running a release in the given train that is earlier than the release
      in a specific column (less than the First Fixed Release) is known to
      be vulnerable. Cisco recommends upgrading to a release equal to or
      later than the release in the "Recommended Releases" column of the
      table.
      
      +----------------------------------------+
      |   Major    | Availability of Repaired  |
      |  Release   |         Releases          |
      |------------+---------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.0-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |----------------------------------------|
      |    There are no affected 12.0 based    |
      |                releases                |
      |----------------------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.1-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.1       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1AZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1CX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1E      | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1GA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1GB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1T      | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XI     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XQ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XT     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XU     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XV     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1YA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YB     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YC     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YD     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(5)YE6  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1YE     | release     | 12.3(26)    |
      |            | 12.1(5)YE6  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YF     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1YG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YI     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1YJ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.2-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.2       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BC     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BW     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BY     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BZ     | first fixed |             |
      |            | in 12.3XI   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2CX     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2CY     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      | 12.2CZ     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2DD     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2DX     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)    |
      |            |             | EWA13       |
      |            | Vulnerable; |             |
      | 12.2EU     | first fixed | 12.2(31)    |
      |            | in 12.2SG   | SGA5        |
      |            |             |             |
      |            |             | 12.2(44)SG  |
      |------------+-------------+-------------|
      |            |             | 12.2(25)    |
      |            |             | EWA13       |
      |            | Vulnerable; |             |
      | 12.2EW     | first fixed | 12.2(31)    |
      |            | in 12.2SG   | SGA5        |
      |            |             |             |
      |            |             | 12.2(44)SG  |
      |------------+-------------+-------------|
      |            | 12.2(25)    |             |
      |            | EWA10       | 12.2(25)    |
      | 12.2EWA    |             | EWA13       |
      |            | 12.2(25)    |             |
      |            | EWA11       |             |
      |------------+-------------+-------------|
      |            | 12.2(35)EX1 |             |
      | 12.2EX     |             | 12.2(40)EX1 |
      |            | 12.2(37)EX  |             |
      |------------+-------------+-------------|
      | 12.2EY     | 12.2(37)EY  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2EZ     | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2FX     | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(25)    |
      | 12.2FY     | first fixed | SEG4        |
      |            | in 12.2SEG  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2FZ     | first fixed | 12.2(44)SE1 |
      |            | in 12.2SE   |             |
      |------------+-------------+-------------|
      | 12.2IXA    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXB    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXC    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXD    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2JA     | first fixed |             |
      |            | in 12.3JA   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2JK     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.2MB     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2MC     | 12.2(15)    | 12.4(18a)   |
      |            | MC2h        |             |
      |------------+-------------+-------------|
      |            | 12.2(14)S18 |             |
      |            |             |             |
      |            | 12.2(18)S13 |             |
      | 12.2S      |             | 12.2(25)S15 |
      |            | 12.2(20)S14 |             |
      |            |             |             |
      |            | 12.2(25)S13 |             |
      |------------+-------------+-------------|
      |            | 12.2(28)SB7 |             |
      |            |             |             |
      |            | 12.2(31)SB5 |             |
      | 12.2SB     |             | 12.2(28)    |
      |            | 12.2(33)SB; | SB12        |
      |            | Available   |             |
      |            | on          |             |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed |             |
      | 12.2SBC    | in 12.2SB;  | 12.2(28)    |
      |            | Available   | SB12        |
      |            | on          |             |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      | 12.2SCA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 12.2(35)SE4 |             |
      | 12.2SE     |             | 12.2(44)SE1 |
      |            | 12.2(37)SE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEA    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEB    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEC    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SED    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      | 12.2SEE    | 12.2(25)    |             |
      |            | SEE4        |             |
      |------------+-------------+-------------|
      | 12.2SEF    | 12.2(25)    | 12.2(44)SE1 |
      |            | SEF3        |             |
      |------------+-------------+-------------|
      | 12.2SEG    | 12.2(25)    | 12.2(25)    |
      |            | SEG3        | SEG4        |
      |------------+-------------+-------------|
      |            | 12.2(25)SG3 |             |
      |            |             |             |
      | 12.2SG     | 12.2(31)SG3 | 12.2(44)SG  |
      |            |             |             |
      |            | 12.2(37)SG  |             |
      |------------+-------------+-------------|
      |            | 12.2(31)    |             |
      |            | SGA2        |             |
      |            |             |             |
      |            | 12.2(31)    |             |
      |            | SGA3        | 12.2(31)    |
      | 12.2SGA    |             | SGA5        |
      |            | 12.2(31)    |             |
      |            | SGA6;       |             |
      |            | Available   |             |
      |            | on          |             |
      |            | 07-APR-2008 |             |
      |------------+-------------+-------------|
      | 12.2SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SM     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SO     | migrate to  | 12.2(29)SVD |
      |            | any release |             |
      |            | in 12.2SVA  |             |
      |------------+-------------+-------------|
      | 12.2SRA    | 12.2(33)    | 12.2(33)    |
      |            | SRA4        | SRA7        |
      |------------+-------------+-------------|
      |            |             | 12.2(33)    |
      |            | 12.2(33)    | SRB3;       |
      | 12.2SRB    | SRB1        | Available   |
      |            |             | on          |
      |            |             | 31-MAR-2008 |
      |------------+-------------+-------------|
      | 12.2SRC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SU     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2SV     | 12.2(29b)SV | 12.2(29b)SV |
      |------------+-------------+-------------|
      | 12.2SVA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SW     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SX     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXA    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXB    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXD    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXE    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | 12.2(18)    |             |
      |            | SXF10a      |             |
      |            |             |             |
      |            | 12.2(18)    |             |
      |            | SXF12a      | 12.2(18)    |
      | 12.2SXF    |             | SXF13       |
      |            | 12.2(18)    |             |
      |            | SXF13a      |             |
      |            |             |             |
      |            | 12.2(18)    |             |
      |            | SXF9        |             |
      |------------+-------------+-------------|
      | 12.2SXH    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SY     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2SZ     | first fixed | 12.2(28)    |
      |            | in 12.2S    | SB12        |
      |            |             |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2T      | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2TPC    | 12.2(8)     |             |
      |            | TPC10b      |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed |             |
      | 12.2UZ     | in 12.2SB;  | 12.2(28)    |
      |            | Available   | SB12        |
      |            | on          |             |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XB     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XC     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XD     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XE     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XF     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XG     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XI     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XJ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XK     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XL     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XM     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2XN     | 12.2(33)XN1 | 12.3(26)    |
      |------------+-------------+-------------|
      | 12.2XO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XQ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XR     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2XS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XT     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XU     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XV     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XW     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | 12.2(4)     |             |
      |            | YA13;       |             |
      | 12.2YA     | Available   | 12.3(26)    |
      |            | on          |             |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YB     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YC     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YD     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2YE     | first fixed | 12.2(28)    |
      |            | in 12.2S    | SB12        |
      |            |             |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YF     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YG     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YJ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YK     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YL     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YM     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YN     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2YO     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YP     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YQ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YR     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2YS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YT     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YU     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YV     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YW     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YX     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YY     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2YZ     | first fixed | 12.2(28)    |
      |            | in 12.2S    | SB12        |
      |            |             |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2ZA     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZB     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZC     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2ZD     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZE     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZF     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.2ZG     | first fixed |             |
      |            | in 12.3YG   | 12.4(18a)   |
      |------------+-------------+-------------|
      | 12.2ZH     | 12.2(13)ZH9 | 12.2(13)    |
      |            |             | ZH11        |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZJ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.2ZL     | first fixed |             |
      |            | in 12.4     | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZP     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZU     | migrate to  | 12.2(33)    |
      |            | any release | SXH2        |
      |            | in 12.2SXH  |             |
      |------------+-------------+-------------|
      | 12.2ZY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.3-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | 12.3(17c)   |             |
      |            |             |             |
      |            | 12.3(18a)   |             |
      | 12.3       |             | 12.3(26)    |
      |            | 12.3(19a)   |             |
      |            |             |             |
      |            | 12.3(23)    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | 12.3(17b)   |             |
      |            | BC8         |             |
      |            |             |             |
      | 12.3BC     | 12.3(21a)   | 12.3(23)BC1 |
      |            | BC2         |             |
      |            |             |             |
      |            | 12.3(23)BC  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3BW     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 12.3(11)JA4 |             |
      | 12.3JA     |             |             |
      |            | 12.3(7)JA5  |             |
      |------------+-------------+-------------|
      | 12.3JEA    | 12.3(8)JEA2 | 12.3(8)JEA4 |
      |------------+-------------+-------------|
      | 12.3JEB    | 12.3(8)JEB1 | 12.3(8)JEB2 |
      |------------+-------------+-------------|
      | 12.3JEC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 12.3(2)JK3  |             |
      | 12.3JK     |             | 12.3(8)JK1  |
      |            | 12.3(8)JK   |             |
      |------------+-------------+-------------|
      | 12.3JL     | 12.3(2)JL2  | 12.3(2)JL4  |
      |------------+-------------+-------------|
      | 12.3JX     | 12.3(7)JX9  | 12.3(7)JX10 |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3T      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3TPC    | 12.3(4)     |             |
      |            | TPC11b      |             |
      |------------+-------------+-------------|
      | 12.3VA     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            |             | 12.3(2)XA7; |
      | 12.3XA     | 12.3(2)XA6  | Available   |
      |            |             | on          |
      |            |             | 31-MAR-2008 |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XB     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.4(15)T4  |
      | 12.3XC     | 12.3(2)XC5  |             |
      |            |             | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XD     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | 12.3(2)XE6; | 12.4(15)T4  |
      | 12.3XE     | Available   |             |
      |            | on          | 12.4(18a)   |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XF     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.3XG     | first fixed |             |
      |            | in 12.3YG   | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XH     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3XI     | 12.3(7)XI10 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3XJ     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XK     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XQ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.3(7)XR8; |
      | 12.3XR     | 12.3(7)XR7  | Available   |
      |            |             | on          |
      |            |             | 31-MAR-2008 |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XS     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XU     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3XW     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XY     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.3YA     | first fixed |             |
      |            | in 12.4     | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YD     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3YF     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.3YG     | 12.3(8)YG6  | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YH     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YI     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YJ     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.3YK     | 12.3(11)YK3 | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.3YM     | 12.3(14)    | 12.3(14)    |
      |            | YM10        | YM12        |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YQ     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | 12.3(11)    |             |
      |            | YS3;        |             |
      | 12.3YS     | Available   | 12.4(15)T4  |
      |            | on          |             |
      |            | 31-MAR-2008 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YT     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YU     | first fixed |             |
      |            | in 12.4XB   |             |
      |------------+-------------+-------------|
      | 12.3YX     | 12.3(14)YX8 | 12.3(14)    |
      |            |             | YX11        |
      |------------+-------------+-------------|
      | 12.3YZ     | 12.3(11)YZ2 |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.4-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | 12.4(10c)   |             |
      |            |             |             |
      |            | 12.4(12)    |             |
      |            |             |             |
      |            | 12.4(17a)   |             |
      |            |             |             |
      | 12.4       | 12.4(3h)    | 12.4(18a)   |
      |            |             |             |
      |            | 12.4(5c)    |             |
      |            |             |             |
      |            | 12.4(7e)    |             |
      |            |             |             |
      |            | 12.4(8d)    |             |
      |------------+-------------+-------------|
      | 12.4JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4MD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4MR     | 12.4(12)MR  | 12.4(16)MR2 |
      |------------+-------------+-------------|
      | 12.4SW     | 12.4(11)SW3 | 12.4(15)SW  |
      |------------+-------------+-------------|
      |            | 12.4(11)T2  |             |
      |            |             |             |
      |            | 12.4(15)T   |             |
      |            |             |             |
      |            | 12.4(2)T6   |             |
      | 12.4T      |             | 12.4(15)T4  |
      |            | 12.4(4)T8   |             |
      |            |             |             |
      |            | 12.4(6)T8   |             |
      |            |             |             |
      |            | 12.4(9)T3   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XA     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XB     | 12.4(2)XB6  |             |
      |------------+-------------+-------------|
      | 12.4XC     | 12.4(4)XC7  |             |
      |------------+-------------+-------------|
      | 12.4XD     | 12.4(4)XD7  | 12.4(4)XD10 |
      |------------+-------------+-------------|
      | 12.4XE     | 12.4(6)XE2  | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.4XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XG     | 12.4(9)XG2  | 12.4(9)XG2  |
      |------------+-------------+-------------|
      | 12.4XJ     | 12.4(11)XJ4 | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.4XK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XT     | 12.4(6)XT1  | 12.4(6)XT2  |
      |------------+-------------+-------------|
      | 12.4XV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XY     | Not         |             |
      |            | Vulnerable  |             |
      +----------------------------------------+
      
      Workarounds
      ===========
      
      A blocked interface can be unblocked by disabling the UDP service
      whose packets are blocking the interface. This procedure can restore
      normal operation of the interface without rebooting the device. The
      procedure for disabling vulnerable services are described in the "If
      IPv4 UDP-based Services Are Not Required" section.
      
      The following workarounds are options that may be available depending
      on the Cisco IOS software running on the device and the operating
      environment. The workarounds depend on whether IPv6 or any of the
      affected UDP services are required for the normal operation.
      
      If IPv6 Protocol Is Not Required
      +-------------------------------
      
      Disable IPv6. To disable IPv6 use the following commands:
      
          Router(config)#interface FastEthernet0/0
          Router(config-if)#no ipv6 address
      
      or
      
          Router(config)#interface FastEthernet0/0
          Router(config-if)#no ipv6 enable
      
      If RSVP is the only affected service that is configured it is
      sufficient to disable IPv6 only on the interface where RSVP is
      configured. If any other affected UDP service is present on the
      device then IPv6 would have to be disabled from all interfaces.
      
      If IPv4 UDP-based Services Are Not Required
      +------------------------------------------
      
      Disable all affected IPv4 UDP-based services.
      
      Disabling TACACS
      +---------------
      
      To disable TACACS use the following commands:
      
          Router(config)#no tacacs-server host <IP-address>
      
      or
      
          Router(config)#no tacacs-server administration
      
      Disabling DNS
      +------------
      
      To disable DNS use the following command:
      
          Router(config)#no ip dns server
      
      Disabling RSVP
      +-------------
      
      To disable RSVP use the following commands:
      
          Router(config)#interface <Interface>
          Router(config)#no ip rsvp bandwidth
      
      Disabling L2F/L2TP
      +-----------------
      
      To disable L2F/L2TP use the following commands:
      
          Router(config)#clear vpdn tunnel l2tp all
          Router(config)#no vpdn-group <group-name>
          Router(config)#no vpdn enable
      
      Disabling IP SLA Responder
      +-------------------------
      
      To disable IP SLA Responder use the following command:
      
          Router(config)#no ip sla monitor responder
      
      Disabling MGCP
      +-------------
      
      To disable MGCP use the following command:
      
          Router(config)#no mgcp
      
      Disabling SIP
      +------------
      
      To disable SIP use the following commands:
      
          Router(config)#sip-ua
          Router(config-sip-ua)#no transport udp
          Router(config-sip-ua)#no transport tcp
      
      If IPv4 UDP-based Services Are Required
      +---------------------------------------
      
      By deploying IPv6 Access Control List (ACL) it is possible to prevent
      offending IPv6 packets reaching vulnerable UDP services. The ACL in
      the following example will block all IPv6 traffic from reaching
      vulnerable services.
      
          Router(config)#ipv6 access-list protect_IPv4_services
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq tacacs
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq domain
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq 1698
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq 1701
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq 1967
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq 2427
          Router(config-ipv6-acl)#deny udp any 2001:DB8:1:128::/64 eq 5060
          
          !-- Permit/deny all other Layer 3 and Layer 4 traffic in accordance        
          !-- with existing security policies and configurations                     
          !
          !-- Allow all other IPv6 traffic
          
          Router(config-ipv6-acl)#permit ipv6 any 2001:db8:1:128::/64
          
          !
          !
          
          Router(config)#interface FastEthernet0/1
          Router(config-if)#ipv6 traffic-filter protect_IPv4_services in
      
      Additional mitigation techniques that can be deployed on Cisco
      devices within the network are available in the Cisco Applied
      Mitigation Bulletin companion document for this advisory:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20080326-IPv4IPv6.shtml
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address this
      vulnerability. 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/products/prod_warranties_item09186a008088e31f.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/warp/public/687/Directory/DirTAC.shtml
      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 encountered in customer networks.
      
      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-20080326-IPv4IPv6.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-bulletin at 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 |             | Initial      |
      | 1.0      | 2008-Mar-26 | 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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