[apops] Cisco Security Advisory: Multiple DLSw Denial of Service Vulnera

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  • Subject: [apops] Cisco Security Advisory: Multiple DLSw Denial of Service Vulnerabilities in Cisco IOS
  • 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: Multiple DLSw Denial of Service
                               Vulnerabilities in Cisco IOS
      
      Advisory ID: cisco-sa-20080326-dlsw
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
      
      Revision 1.0
      
      For Public Release 2008 March 26 1600 UTC (GMT)
      
      Summary
      =======
      
      Cisco IOS contains multiple vulnerabilities in the Data-link
      Switching (DLSw) feature that may result in a reload or memory leaks
      when processing specially crafted UDP or IP Protocol 91 packets.
      
      Cisco has released free software updates that address these
      vulnerabilities. Workarounds are available to mitigate the effects of
      these vulnerabilities.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.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
      +------------------
      
      This security advisory applies to all Cisco products that run any
      version of affected Cisco IOS software configured for DLSw. Systems
      that contain the DLSw feature, but do not have it enabled, are not
      affected.
      
      Routers enabled for DLSw contain a line in the configuration defining
      a local DLSw peer. This configuration can be observed by issuing the
      command "show running-config". Systems configured for DLSw contain
      lines similar to the following:
      
          "dlsw local-peer"
      
      or
      
          "dlsw local-peer peer-id <IP address>"
      
      Any version of Cisco IOS prior to the versions which are listed in
      the Software Versions and Fixes section below is vulnerable.
      
      To determine the version of Cisco IOS software running on a Cisco
      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 IOS release name. Other Cisco devices
      will not have the "show version" command or will give different 
      output.
      
      The following example identifies a Cisco product running Cisco IOS
      Software Release 12.3(6) with an installed image name of C3640-IS-M:
      
          Cisco Internetwork Operating System Software
          IOS (tm) 3600 Software (C3640-IS-M), Version 12.3(6), RELEASE SOFTWARE (fc3)
      
      The next example shows a product running Cisco IOS Software Release
      12.3(11)T3 with an image name of C3845-ADVIPSERVICESK9-M:
      
          Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 12.3(11)T3, RELEASE SOFTWARE (fc4)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2005 by Cisco Systems, Inc.
      
      Additional information about Cisco IOS release naming can be found at
      http://www.cisco.com/warp/public/620/1.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS devices that are not configured for DLSw are not
      vulnerable.
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details
      =======
      
      Data-link switching (DLSw) provides a means of transporting IBM
      Systems Network Architecture (SNA) and network basic input/output
      system (NetBIOS) traffic over an IP network. Cisco implementation of
      DLSw also uses UDP port 2067 and IP Protocol 91 for Fast Sequenced
      Transport (FST).
      
      Multiple vulnerabilities exists in Cisco IOS when processing UDP and
      IP protocol 91 packets. These vulnerabilities do not affect TCP
      packet processing. A successful exploitation may result in a reload
      of the system or a memory leak on the device, leading to a denial of
      service (DoS) condition.
      
      Cisco IOS devices configured for DLSw with "dlsw local-peer"
      automatically listen for IP protocol 91 packets. A Cisco IOS device
      that is configured for DLSw with the "dlsw local-peer peer-id
      <IP-address>" command listen for IP protocol 91 packets and UDP port
      2067.
      
      Cisco IOS devices listen to IP protocol 91 packets when DLSw is
      configured. However, it is only used if DLSw is configured for Fast
      Sequenced Transport (FST). A DLSw FST peer configuration will contain
      the following line:
      
          "dlsw remote-peer 0 fst <ip-address>"
      
      It is possible to disable UDP processing in DLSw with the "dlsw
      udp-disable" command. However, disabling UDP only prevents the 
      sending of UDP packets, it does not prevent the device from receiving
      and processing incoming UDP packets.
      
      These vulnerabilities are documented in Cisco Bug ID CSCsk73104 
      and have been assigned Common Vulnerabilities and Exposures (CVE) ID
      CVE-2008-1152.
      
      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 
      
      CSCsk73104 - Handling of malformed packets by DLSW
      
        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 these vulnerabilities may result in the
      reload of the device or memory leaks, leading to a DoS condition.
      
      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  |             |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0       | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(8)DA3  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      |            | release     |             |
      | 12.0DA     | 12.0(8)DA3  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | migrate to  |             |
      |            | any release |             |
      |            | in 12.2DA   |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(7)DB   |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.0DB     | release     | 12.4(18a)   |
      |            | 12.0(7)DB   |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(7)DC   |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.0DC     | release     | 12.4(18a)   |
      |            | 12.0(7)DC   |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(17)S5  |             |
      |            | are         |             |
      | 12.0S      | vulnerable, | 12.0(32)S10 |
      |            | release     |             |
      |            | 12.0(17)S5  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.0SC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0ST     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0T      | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.0W      | Vulnerable; | 12.0(3c)W5  |
      |            | contact TAC | (8)         |
      |------------+-------------+-------------|
      | 12.0WC     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.0WT     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.0XB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(2)XC2  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.0XC     | release     | 12.3(26)    |
      |            | 12.0(2)XC2  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XD     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XE     | first fixed |             |
      |            | in 12.1E    |             |
      |------------+-------------+-------------|
      | 12.0XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XG     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(4)XI2  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.0XI     | release     | 12.3(26)    |
      |            | 12.0(4)XI2  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.0(4)XJ5  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.0XJ     | release     | 12.3(26)    |
      |            | 12.0(4)XJ5  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XK     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.0XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XN     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XQ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0XR     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.0XS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.1-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1       | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1AA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1AX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(22)AY1 |             |
      |            | are         |             |
      | 12.1AY     | vulnerable, | 12.1(22)    |
      |            | release     | EA11        |
      |            | 12.1(22)AY1 |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.1AZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1CX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(4)DB1  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1DB     | release     | 12.4(18a)   |
      |            | 12.1(4)DB1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(4)DC2  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1DC     | release     | 12.4(18a)   |
      |            | 12.1(4)DC2  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.1E      | 12.1(27b)E4 |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(11)EA1 |             |
      |            | are         |             |
      | 12.1EA     | vulnerable, | 12.1(22)    |
      |            | release     | EA11        |
      |            | 12.1(11)EA1 |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.1EB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1EC     | migrate to  | 12.3(23)BC1 |
      |            | any release |             |
      |            | in 12.2BC   |             |
      |------------+-------------+-------------|
      | 12.1EO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1EW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1EX     | first fixed |             |
      |            | in 12.1E    |             |
      |------------+-------------+-------------|
      | 12.1EY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1EZ     | first fixed |             |
      |            | in 12.1E    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1GA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1GB     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1T      | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XC     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XD     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XG     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XI     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XJ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XM     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1XO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XP     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XQ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XS     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(3)XT2  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1XT     | release     | 12.3(26)    |
      |            | 12.1(3)XT2  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1XU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(5)XV1  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1XV     | release     | 12.3(26)    |
      |            | 12.1(5)XV1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XW     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XX     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XY     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1XZ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YA     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YB     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1YC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.1YD     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.1(5)YE1  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.1YE     | release     | 12.3(26)    |
      |            | 12.1(5)YE1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.1YF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1YG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.1YH     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 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  |             |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2       | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2BC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BW     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BY     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2BZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 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     |             |
      |------------+-------------+-------------|
      | 12.2EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EWA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2EX     | migrate to  | 12.2(40)EX1 |
      |            | any release |             |
      |            | in 12.2SEA  |             |
      |------------+-------------+-------------|
      | 12.2EY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2EZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2IXA    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXB    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXC    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2IXD    | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      |            | migrate to  | IXF;        |
      | 12.2IXE    | any release | Available   |
      |            | in 12.2IXF  | on          |
      |            |             | 31-MAR-08   |
      |------------+-------------+-------------|
      | 12.2JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2JK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MC     | 12.2(15)    | 12.4(18a)   |
      |            | MC2h        |             |
      |------------+-------------+-------------|
      | 12.2S      | 12.2(25)S15 | 12.2(25)S15 |
      |------------+-------------+-------------|
      |            | 12.2(28)    |             |
      |            | SB10        |             |
      |            |             |             |
      |            | 12.2(31)SB9 | 12.2(28)    |
      | 12.2SB     |             | SB12        |
      |            | 12.2(33)SB; |             |
      |            | Available   |             |
      |            | on          |             |
      |            | 31-MAR-08   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.2SB   |             |
      |            |             |             |
      | 12.2SBC    | Vulnerable; | 12.2(28)    |
      |            | first fixed | SB12        |
      |            | in 12.2SB;  |             |
      |            | Available   |             |
      |            | on          |             |
      |            | 31-MAR-08   |             |
      |------------+-------------+-------------|
      | 12.2SCA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SED    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEF    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEG    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SG     | 12.2(44)SG  | 12.2(44)SG  |
      |------------+-------------+-------------|
      | 12.2SGA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SRA    | 12.2(33)    | 12.2(33)    |
      |            | SRA6        | SRA7        |
      |------------+-------------+-------------|
      |            | 12.2(33)    | 12.2(33)    |
      |            | SRB3;       | SRB3;       |
      | 12.2SRB    | Available   | Available   |
      |            | on          | on          |
      |            | 31-MAR-08   | 31-MAR-08   |
      |------------+-------------+-------------|
      | 12.2SRC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SU     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(29a)   |             |
      |            | SV1 are     |             |
      |            | vulnerable, |             |
      |            | release     |             |
      | 12.2SV     | 12.2(29a)   | 12.2(29b)SV |
      |            | SV1 and     |             |
      |            | later are   |             |
      |            | not         |             |
      |            | vulnerable; |             |
      |            | migrate to  |             |
      |            | any release |             |
      |            | in 12.2SVA  |             |
      |------------+-------------+-------------|
      | 12.2SVA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(25)    |             |
      |            | SW10 are    |             |
      |            | vulnerable, |             |
      | 12.2SW     | release     |             |
      |            | 12.2(25)    |             |
      |            | SW10 and    |             |
      |            | later are   |             |
      |            | not         |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      |            | 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)    |             |
      |            | SXF12       |             |
      |            |             |             |
      | 12.2SXF    | 12.2(18)    | 12.2(18)    |
      |            | SXF12a      | SXF13       |
      |            |             |             |
      |            | 12.2(18)    |             |
      |            | SXF13a      |             |
      |------------+-------------+-------------|
      | 12.2SXH    | 12.2(33)    |             |
      |            | SXH1        |             |
      |------------+-------------+-------------|
      |            | 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)     |             |
      |            | TPC10d      |             |
      |------------+-------------+-------------|
      | 12.2UZ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 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     |             |
      |------------+-------------+-------------|
      | 12.2XE     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2XF     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XG     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2XH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2XI     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 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     |             |
      |------------+-------------+-------------|
      | 12.2XR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 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     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(4)YA8  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.2YA     | release     | 12.3(26)    |
      |            | 12.2(4)YA8  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | 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     |             |
      |------------+-------------+-------------|
      | 12.2YG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(8)YJ1  |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.2YJ     | release     | 12.3(26)    |
      |            | 12.2(8)YJ1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2YK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 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  |             |
      |------------+-------------+-------------|
      | 12.2YP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YQ     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 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     |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(11)YV1 |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.2YV     | release     | 12.4(18a)   |
      |            | 12.2(11)YV1 |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | 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     |             |
      |------------+-------------+-------------|
      | 12.2ZC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 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     |             |
      |------------+-------------+-------------|
      | 12.2ZG     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.2(13)ZH6 |             |
      |            | are         |             |
      |            | vulnerable, |             |
      | 12.2ZH     | release     | 12.2(13)    |
      |            | 12.2(13)ZH6 | ZH11        |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |            | first fixed |             |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | 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)   |
      |------------+-------------+-------------|
      | 12.2ZP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(33)    |
      | 12.2ZU     | first fixed | SXH2        |
      |            | in 12.2SXH  |             |
      |------------+-------------+-------------|
      | 12.2ZY     | 12.2(18)ZY2 | 12.2(18)ZY2 |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.3-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.3       | 12.3(24)    | 12.3(26)    |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3BC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3BW     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.3(8)JK1  |             |
      |            | are         |             |
      | 12.3JK     | vulnerable, | 12.3(8)JK1  |
      |            | release     |             |
      |            | 12.3(8)JK1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.3JL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3T      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3TPC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3VA     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | 12.3(2)XA7; | 12.3(2)XA7; |
      | 12.3XA     | Available   | Available   |
      |            | on          | on          |
      |            | 31-MAR-08   | 31-MAR-08   |
      |------------+-------------+-------------|
      |            | 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-08   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XF     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed | 12.4(15)T4  |
      | 12.3XG     | in 12.3YG;  |             |
      |            | Available   | 12.4(18a)   |
      |            | on          |             |
      |            | 16-JUN-08   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XH     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | 12.3(7)     |             |
      |            | XI11;       |             |
      | 12.3XI     | Available   |             |
      |            | on          |             |
      |            | 18-SEP-08   |             |
      |------------+-------------+-------------|
      |            | 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; | 12.3(7)XR8; |
      | 12.3XR     | Available   | Available   |
      |            | on          | on          |
      |            | 31-MAR-08   | 31-MAR-08   |
      |------------+-------------+-------------|
      | 12.3XS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 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  |
      |------------+-------------+-------------|
      | 12.3XY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3YA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3YD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3YF     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | 12.3(8)YG7; |             |
      | 12.3YG     | Available   | 12.4(15)T4  |
      |            | on          |             |
      |            | 16-JUN-08   |             |
      |------------+-------------+-------------|
      |            | 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    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YK     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.3YM     | 12.3(14)    | 12.3(14)    |
      |            | YM12        | 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-08   |             |
      |------------+-------------+-------------|
      |            | 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)    | 12.3(14)    |
      |            | YX11        | YX11        |
      |------------+-------------+-------------|
      | 12.3YZ     | 12.3(11)YZ3 |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.4-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | 12.4(10c)   |             |
      |            |             |             |
      |            | 12.4(13e)   |             |
      |            |             |             |
      |            | 12.4(16b)   |             |
      | 12.4       |             | 12.4(18a)   |
      |            | 12.4(17)    |             |
      |            |             |             |
      |            | 12.4(3h)    |             |
      |            |             |             |
      |            | 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  |             |
      |------------+-------------+-------------|
      |            | 12.4(15)MD; |             |
      | 12.4MD     | Available   |             |
      |            | on          |             |
      |            | 09-MAY-08   |             |
      |------------+-------------+-------------|
      | 12.4MR     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4SW     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | 12.4(15)T2  |             |
      |            |             |             |
      | 12.4T      | 12.4(6)T10  | 12.4(15)T4  |
      |            |             |             |
      |            | 12.4(9)T7   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XA     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XB     | 12.4(2)XB6  |             |
      |------------+-------------+-------------|
      | 12.4XC     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.4XD     | 12.4(4)XD10 | 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  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XJ     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XK     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XL     | 12.4(15)XL2 |             |
      |------------+-------------+-------------|
      | 12.4XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XT     | 12.4(6)XT2  | 12.4(6)XT2  |
      |------------+-------------+-------------|
      | 12.4XV     | 12.4(11)XV  |             |
      |------------+-------------+-------------|
      | 12.4XW     | Vulnerable; | 12.4(11)XW6 |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.4XY     | Not         |             |
      |            | Vulnerable  |             |
      +----------------------------------------+
      
      A special patch for Cisco IOS Software Modularity is also available
      and can be downloaded from the Cisco IOS Software Modularity Patch
      Navigator at http://tools.cisco.com/swdf/ionpn/jsp/main.jsp.
      
      Workarounds
      ===========
      
      The workaround consists of filtering UDP packets to port 2067 and IP
      protocol 91 packets. Filters can be applied at network boundaries to
      filter all IP protocol 91 packets and UDP packets to port 2067 or can
      be applied on individual affected devices to permit such traffic only
      from trusted peer IP addresses. However, since both of the protocols
      are connectionless, it is possible for an attacker to spoof malformed
      packets from legitimate peer IP addresses.
      
      As soon as DLSw is configured, the Cisco IOS device begins listening
      on IP protocol 91. However, this protocol is only used if DLSw is
      configured for Fast Sequenced Transport (FST). A DLSw FST peer
      configuration will contain the following line:
      
          "dlsw remote-peer 0 fst <ip-address>"
      
      If FST is used, filtering IP protocol 91 will break the operation, so
      filters need to permit protocol 91 traffic from legitimate peer IP
      addresses.
      
      It is possible to disable UDP processing in DLSw with the "dlsw
      udp-disable" command. However, disabling UDP only prevents the sending
      of UDP packets, it does not prevent the receiving and processing of
      incoming UDP packets. To protect a vulnerable device from malicious
      packets via UDP port 2067, both of the following actions must be
      taken:
      
       1. Disable UDP outgoing packets with the "dlsw udp-disable" command,
          AND
       2. Filter UDP 2067 in the vulnerable device using infrastructure
          ACL.
      
      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-dlsw.shtml
      
      Using Control Plane Policing on Affected Devices
      +-----------------------------------------------
      
      Control Plane Policing (CoPP) can be used to block untrusted DLSw
      traffic to the device. Cisco IOS software 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, which uses 192.168.100.1
      to represent a trusted host, can be adapted to your network. If FST
      is not used, protocol 91 may be completely filtered. Additionally, if
      UDP is disabled with the "dlsw udp-disable" command, UDP port 2067 
      may also be completely filtered.
      
          
          !--- Deny DLSw traffic from trusted hosts to all IP addresses
          !--- configured on all interfaces of the affected device so that
          !--- it will be allowed by the CoPP feature
          
          access-list 111 deny udp host 192.168.100.1 any eq 2067
          access-list 111 deny 91 host 192.168.100.1 any
          
          !--- Permit all other DLSw traffic sent to all IP addresses
          !--- configured on all interfaces of the affected device so that it
          !--- will be policed and dropped by the CoPP feature
          
          access-list 111 permit udp any any eq 2067
          access-list 111 permit 91 any any 
          
          !--- Permit (Police or Drop)/Deny (Allow) all other Layer 3 and Layer 4
          !--- 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-DLSw-class
           match access-group 111
          
          !--- Create a Policy-Map that will be applied to the
          !--- Control-Plane of the device.
          
          policy-map drop-DLSw-traffic
           class drop-DLSw-class
            drop
          
          !--- Apply the Policy-Map to the Control-Plane of the
          !--- device
          
          control-plane
           service-policy input drop-DLSw-traffic
      
      In the above CoPP example, the access control entries (ACEs) which
      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. Please note that in the
      Cisco IOS 12.2S and 12.0S trains the policy-map syntax is different:
      
          policy-map drop-DLSw-traffic
           class drop-DLSw-class
            police 32000 1500 1500 conform-action drop exceed-action drop
      
      Additional information on the configuration and use of the CoPP
      feature is available at 
      http://www.cisco.com/en/US/products/ps6642/products_white_paper0900aecd804fa16a.shtml 
      and http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a008052446b.html.
      
      Using Infrastructure ACLs at Network Boundary
      +--------------------------------------------
      
      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. iACLs are 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 iACL example shown below should be included as
      part of the deployed infrastructure access-list that will protect all
      devices with IP addresses in the infrastructure IP address range. If
      FST is not used, protocol 91 may be completely filtered.
      Additionally, if UDP is disabled with the "dlsw udp-disable" command,
      UDP port 2067 may also be completely filtered.
      
          
          !--- Permit DLSw (UDP port 2067 and IP protocol 91) packets
          !--- from trusted hosts destined to infrastructure addresses.
          
          access-list 150 permit udp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 2067
          access-list 150 permit 91 TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK 
          
          !--- Deny DLSw (UDP port 2067 and IP protocol 91) packets from 
          !--- all other sources destined to infrastructure addresses.
          
          access-list 150 deny udp any INFRASTRUCTURE_ADDRESSES MASK eq 2067
          access-list 150 deny 91 any INFRASTRUCTURE_ADDRESSES MASK
          
          !--- Permit/deny all other Layer 3 and Layer 4 traffic in accordance
          !--- with existing security policies and configurations
          !--- Permit all other traffic to transit the device.
          
          access-list 150 permit ip any any
          interface serial 2/0
           ip access-group 150 in
      
      The white paper entitled "Protecting Your Core: Infrastructure
      Protection Access Control Lists" presents guidelines and recommended
      deployment techniques for infrastructure protection access lists.
      This white paper can be obtained at the following link:
      
      http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
      
      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/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.
      
      These vulnerabilities were found internally.
      
      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-dlsw.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-teams 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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