[apops] Cisco Security Advisory: Cisco IOS Software IPv6 over MPLS Vulne

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software IPv6 over MPLS Vulnerabilities
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Sep 2011 12:00:00 -0400
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      Cisco Security Advisory: Cisco IOS Software IPv6 over MPLS
      Vulnerabilities
      
      Advisory ID: cisco-sa-20110928-ipv6mpls
      
      Revision 1.0
      
      For Public Release 2011 September 28 1600 UTC (GMT)
      
      +---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS Software is affected by two vulnerabilities that cause a
      Cisco IOS device to reload when processing IP version 6 (IPv6)
      packets over a Multiprotocol Label Switching (MPLS) domain. These
      vulnerabilities are:
      
        * Crafted IPv6 Packet May Cause MPLS-Configured Device to Reload
        * ICMPv6 Packet May Cause MPLS-Configured Device to Reload
      
      Cisco has released free software updates that address these
      vulnerabilities.
      
      Workarounds that mitigate these vulnerabilities are available.
      
      This advisory is posted at
      http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipv6mpls.shtml.
      
      Note: The September 28, 2011, Cisco IOS Software Security Advisory
      bundled publication includes ten Cisco Security Advisories. Nine of the
      advisories address vulnerabilities in Cisco IOS Software, and one
      advisory addresses a vulnerability in Cisco Unified Communications
      Manager. Each advisory lists the Cisco IOS Software releases that
      correct the vulnerability or vulnerabilities detailed in the advisory as
      well as the Cisco IOS Software releases that correct all vulnerabilities
      in the September 2011 Bundled Publication.
      
      Individual publication links are in "Cisco Event Response: Semiannual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Cisco IOS Software or Cisco IOS XE Software devices (hereafter both
      referenced as Cisco IOS Software in this document) that are running
      vulnerable versions of Cisco IOS Software and configured for MPLS are
      affected by two vulnerabilities related to IPv6 traffic that
      traverses an MPLS domain. The two vulnerabilities are independent of
      each other.
      
      Note: IPv6 does not need to be configured on the affected devices
      themselves. The vulnerabilities do require the MPLS label switched
      packets to have specific IPv6 payloads to be exploited.
      
      To determine whether a device is configured for MPLS, log in to the
      device and issue the command-line interface (CLI) command "show mpls
      interface". If the IP state is "Yes", the device is vulnerable. The
      following example shows a device that has MPLS configured on
      interface Ethernet0/0:
      
          Router#show mpls interface
          Interface       IP           Tunnel  BGP  Static  Operational
          Ethernet0/0   Yes (ldp)    No      No   No       Yes
          Router#
      
      The following two examples show responses from a device with MPLS
      forwarding disabled. The first example shows a return of no
      interfaces:
      
          router#show mpls interface
          Interface              IP            Tunnel   BGP Static Operational
          routers#
      
      In the second example, the device provides a message indicating that
      MPLS forwarding is not configured:
      
          router#show mpls interface
          no MPLS apps enabled or MPLS not enabled on any interfaces
      
          router#
      
      To determine the Cisco IOS Software release that is running on a Cisco
      product, administrators can log in to the device and issue the "show
      version" command to display the system banner. The system banner
      confirms that the device is running Cisco IOS Software by displaying
      text similar to "Cisco Internetwork Operating System Software" or "Cisco
      IOS Software." The image name displays in parentheses, followed by
      "Version" and the Cisco IOS Software release name. Other Cisco devices
      do not have the "show version" command or may provide different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 15.0(1)M1 with an installed image name of
      C3900-UNIVERSALK9-M:
      
          Router> show version
          Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2009 by Cisco Systems, Inc.
          Compiled Wed 02-Dec-09 17:17 by prod_rel_team
      
      
          !--- output truncated
      
      
      Additional information about Cisco IOS Software
      release naming conventions is available in the white
      paper Cisco IOS and NX-OS Software Reference Guide at
      http://www.cisco.com/web/about/security/intelligence/ios-ref.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Devices that are not configured for MPLS are not vulnerable.
      
      The following products have been confirmed not to be affected by
      these vulnerabilities:
      
        * Cisco IOS XR Software
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details
      =======
      
      The packet handling nodes in an MPLS network are called provider
      routers (P routers) and provider edge routers (PE routers) and are
      configured with MPLS. Both P and PE routers are vulnerable to both
      the vulnerabilities disclosed in this advisory.
      
      In networks that have MPLS enabled and could carry MPLS label
      switched packets with IPv6 payloads, the device may crash when
      processing MPLS label switched packets with specific IPv6 payloads.
      Typical deployment scenarios that would be affected by either
      vulnerability would be Cisco IPv6 Provider Edge Router (6PE) or IPv6
      VPN Provider Edge Router (6VPE).
      
      Crafted IPv6 Packet May Cause MPLS-Configured Device to Reload
      +-------------------------------------------------------------
      
      A crafted IPv6 packet may cause the device to crash when the packet
      is processed by Cisco IOS Software because the MPLS TTL has expired.
      The crafted packet used to exploit this vulnerability would be
      silently discarded in Cisco IOS Software if received on an interface
      where the packet did not have an MPLS label.
      
      This vulnerability is documented in Cisco bug ID CSCto07919 and has been
      assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-3274.
      
      ICMPv6 Packet May Cause MPLS-Configured Device to Reload
      +-------------------------------------------------------------
      
      A valid ICMPv6 packet may cause the device to crash when the packet
      is processed by Cisco IOS Software because the MPLS TTL has expired.
      The packet used to exploit this vulnerability would not affect Cisco
      IOS Software if received on an interface where the packet did not
      have an MPLS label.
      
      This vulnerability is documented in Cisco bug ID CSCtj30155 and has been
      assigned CVE ID CVE-2011-3282.
      
      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
      
      
      * CSCto07919 ("Crafted IPv6 packet may cause MPLS configured device to
      reload")
      
      CVSS Base Score - 6.1
          Access Vector -            Adjacent Network
          Access Complexity -        Low
          Authentication -           None
          Confidentiality Impact -   None
          Integrity Impact -         None
          Availability Impact -      Complete
      
      CVSS Temporal Score - 5.0
          Exploitability -           Functional
          Remediation Level -        Official-Fix
          Report Confidence -        Confirmed
      
      
      * CSCtj30155 ("ICMPv6 packet may cause MPLS configured device to
      reload")
      
      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 cause the device
      to reload. Repeated exploitation could result in a sustained denial
      of service 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.
      
      Additionally, the Cisco IOS Software Checker is available on
      the Cisco Security Intelligence Operations (SIO) portal at
      http://tools.cisco.com/security/center/selectIOSVersion.x. It provides
      several features for checking which Security Advisories affect specified
      versions of Cisco IOS Software.
      
      Cisco IOS Software
      +-----------------
      
      Each row of the following Cisco IOS Software table corresponds to a
      Cisco IOS Software train. If a particular train is vulnerable, the
      earliest releases that contain the fix are listed in the First Fixed
      Release For This Advisory column. The First Fixed Release for All
      Advisories in the September 2011 Bundled Publication column lists the
      earliest possible releases that correct all the published
      vulnerabilities in the Cisco IOS Software Security Advisory bundled
      publication. Cisco recommends upgrading to the latest available
      release, where possible.
      
      +------------------------------------------------------------+
      |   Major    |         Availability of Repaired Releases     |
      |  Release   |                                               |
      |------------+-----------------------------------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 12.0-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------------------------------------------------------|
      | There are no affected 12.0-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 12.1-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------+-----------------------+-----------------------|
      | 12.1E      | Not vulnerable        | 12.2(18)SXF17b        |
      |------------+-----------------------+-----------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 12.2-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------+-----------------------+-----------------------|
      | 12.2       | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2B      | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2BC     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2BW     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2BX     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SB                |
      |------------+-----------------------+-----------------------|
      | 12.2BY     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2BZ     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2CX     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2CY     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2CZ     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SB                |
      |------------+-----------------------+-----------------------|
      | 12.2DA     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2DD     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2DX     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2EU     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases up to and    |
      | 12.2EW     | Not vulnerable        | including 12.2(20)EW4 |
      |            |                       | are not vulnerable.   |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2EWA    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2EX     | Not vulnerable        | 12.2(55)EX3           |
      |------------+-----------------------+-----------------------|
      | 12.2EY     | Not vulnerable        | 12.2(58)EY            |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; migrate   |
      | 12.2EZ     | Not vulnerable        | to any release in     |
      |            |                       | 15.0SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2FX     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2FY     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2EX                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2FZ     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; migrate   |
      | 12.2IRA    | Not vulnerable        | to any release in     |
      |            |                       | 12.2IRG               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; migrate   |
      | 12.2IRB    | Not vulnerable        | to any release in     |
      |            |                       | 12.2IRG               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; migrate   |
      | 12.2IRC    | Not vulnerable        | to any release in     |
      |            |                       | 12.2IRG               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IRD    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IRE    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; migrate   |
      | 12.2IRF    | Not vulnerable        | to any release in     |
      |            |                       | 12.2IRG               |
      |------------+-----------------------+-----------------------|
      | 12.2IRG    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXA    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXB    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXC    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXD    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXE    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXF    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXG    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2IXH    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2JA     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2JK     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2MB     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2MC     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2MRA    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SRD               |
      |------------+-----------------------+-----------------------|
      | 12.2MRB    | Not vulnerable        | 12.2(33)MRB5          |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases prior to     |
      |            |                       | 12.2(30)S are         |
      |            |                       | vulnerable; Releases  |
      | 12.2S      | Not vulnerable        | 12.2(30)S and later   |
      |            |                       | are not vulnerable.   |
      |            |                       | First fixed in        |
      |            |                       | Release 12.2SB        |
      |------------+-----------------------+-----------------------|
      |            |                       | 12.2(31)SB20          |
      | 12.2SB     | Not vulnerable        |                       |
      |            |                       | 12.2(33)SB10          |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SBC    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SB                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SCA    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SCC               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SCB    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SCC               |
      |------------+-----------------------+-----------------------|
      | 12.2SCC    | Not vulnerable        | 12.2(33)SCC7          |
      |------------+-----------------------+-----------------------|
      | 12.2SCD    | Not vulnerable        | 12.2(33)SCD6          |
      |------------+-----------------------+-----------------------|
      |            |                       | 12.2(33)SCE1          |
      | 12.2SCE    | Not vulnerable        |                       |
      |            |                       | 12.2(33)SCE2          |
      |------------+-----------------------+-----------------------|
      | 12.2SCF    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | 12.2(55)SE3           |
      | 12.2SE     | Not vulnerable        |                       |
      |            |                       | 12.2(58)SE            |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SEA    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SEB    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SEC    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SED    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SEE    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SEF    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SE                |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases prior to     |
      |            |                       | 12.2(25)SEG4 are      |
      |            |                       | vulnerable; Releases  |
      | 12.2SEG    | Not vulnerable        | 12.2(25)SEG4 and      |
      |            |                       | later are not         |
      |            |                       | vulnerable. First     |
      |            |                       | fixed in Release      |
      |            |                       | 12.2EX                |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases prior to     |
      |            |                       | 12.2(53)SG4 are       |
      | 12.2SG     | Not vulnerable        | vulnerable; Releases  |
      |            |                       | 12.2(53)SG4 and later |
      |            |                       | are not vulnerable.   |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2SGA    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2SL     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2SM     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2SO     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SQ     | Not vulnerable        | 12.2(50)SQ3           |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SRA    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SRD               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SRB    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SRD               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SRC    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SRD               |
      |------------+-----------------------+-----------------------|
      | 12.2SRD    | Not vulnerable        | 12.2(33)SRD6          |
      |------------+-----------------------+-----------------------|
      | 12.2SRE    | 12.2(33)SRE4          | 12.2(33)SRE4          |
      |------------+-----------------------+-----------------------|
      | 12.2STE    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SU     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases prior to     |
      |            |                       | 12.2(29a)SV are       |
      |            |                       | vulnerable; Releases  |
      | 12.2SV     | Not vulnerable        | 12.2(29a)SV and later |
      |            |                       | are not vulnerable.   |
      |            |                       | Migrate to any        |
      |            |                       | release in 12.2SVD    |
      |------------+-----------------------+-----------------------|
      | 12.2SVA    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SVC    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SVD    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SVE    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2SW     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SX     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SXA    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SXB    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SXD    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SXE    | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      | 12.2SXF    | Not vulnerable        | 12.2(18)SXF17b        |
      |------------+-----------------------+-----------------------|
      | 12.2SXH    | Not vulnerable        | 12.2(33)SXH8a         |
      |------------+-----------------------+-----------------------|
      | 12.2SXI    | Not vulnerable        | 12.2(33)SXI6          |
      |------------+-----------------------+-----------------------|
      | 12.2SXJ    | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2SY     | Not vulnerable        | 12.2(50)SY            |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2SZ     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SB                |
      |------------+-----------------------+-----------------------|
      | 12.2T      | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2TPC    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2XA     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XB     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2XC     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XD     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XE     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XF     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XG     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XH     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XI     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XJ     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XK     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XL     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XM     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XN     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XNA    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      | 12.2XNB    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      | 12.2XNC    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      | 12.2XND    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      | 12.2XNE    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      | 12.2XNF    | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      |            |                       | Releases prior to     |
      |            |                       | 12.2(54)XO are        |
      | 12.2XO     | Not vulnerable        | vulnerable; Releases  |
      |            |                       | 12.2(54)XO and later  |
      |            |                       | are not vulnerable.   |
      |------------+-----------------------+-----------------------|
      | 12.2XQ     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XR     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XS     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XT     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XU     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XV     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2XW     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2YA     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2YB     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2YC     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2YD     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2YE     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YF     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YG     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YH     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YJ     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2YK     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YL     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2YM     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YN     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2YO     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2YP     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YQ     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YR     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YS     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YT     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YU     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YV     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YW     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YX     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YY     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2YZ     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2ZA     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXF               |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2ZB     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2ZC     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2ZD     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2ZE     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2ZF     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2ZG     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 12.2ZH     | Not vulnerable        | Vulnerable; first     |
      |            |                       | fixed in Release 12.4 |
      |------------+-----------------------+-----------------------|
      | 12.2ZJ     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2ZL     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 12.2ZP     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; first     |
      | 12.2ZU     | Not vulnerable        | fixed in Release      |
      |            |                       | 12.2SXH               |
      |------------+-----------------------+-----------------------|
      | 12.2ZX     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2ZY     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 12.2ZYA    | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 12.3-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------------------------------------------------------|
      | There are no affected 12.3-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 12.4-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------------------------------------------------------|
      | There are no affected 12.4-based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 15.0-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------+-----------------------+-----------------------|
      | 15.0M      | 15.0(1)M7             | 15.0(1)M7             |
      |------------+-----------------------+-----------------------|
      |            | Vulnerable; contact   | Vulnerable; contact   |
      |            | your support          | your support          |
      |            | organization per the  | organization per the  |
      | 15.0MR     | instructions in the   | instructions in the   |
      |            | Obtaining Fixed       | Obtaining Fixed       |
      |            | Software section of   | Software section of   |
      |            | this advisory.        | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            | Vulnerable; contact   | Vulnerable; contact   |
      |            | your support          | your support          |
      |            | organization per the  | organization per the  |
      | 15.0MRA    | instructions in the   | instructions in the   |
      |            | Obtaining Fixed       | Obtaining Fixed       |
      |            | Software section of   | Software section of   |
      |            | this advisory.        | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 15.0S      | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 15.0SA     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 15.0SE     | Not vulnerable        | Not vulnerable        |
      |------------+-----------------------+-----------------------|
      | 15.0SG     | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      |            | Vulnerable; first     | Vulnerable; first     |
      | 15.0XA     | fixed in Release      | fixed in Release      |
      |            | 15.1T                 | 15.1T                 |
      |------------+-----------------------+-----------------------|
      | 15.0XO     | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 15.1-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 15.1EY     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      |            | Vulnerable; first     | Vulnerable; first     |
      | 15.1GC     | fixed in Release      | fixed in Release      |
      |            | 15.1T                 | 15.1T                 |
      |------------+-----------------------+-----------------------|
      | 15.1M      | 15.1(4)M1             | 15.1(4)M2; Available  |
      |            |                       | on 30-SEP-11          |
      |------------+-----------------------+-----------------------|
      |            |                       | Vulnerable; contact   |
      |            |                       | your support          |
      |            |                       | organization per the  |
      | 15.1MR     | Not vulnerable        | instructions in the   |
      |            |                       | Obtaining Fixed       |
      |            |                       | Software section of   |
      |            |                       | this advisory.        |
      |------------+-----------------------+-----------------------|
      | 15.1S      | See Cisco IOS-XE      | See Cisco IOS-XE      |
      |            | Software Availability | Software Availability |
      |------------+-----------------------+-----------------------|
      |            | 15.1(1)T4; Available  |                       |
      |            | on 09-DEC-11          | 15.1(2)T4             |
      | 15.1T      |                       |                       |
      |            | 15.1(2)T4             | 15.1(1)T4 on          |
      |            |                       | 8-Dec-2011            |
      |            | 15.1(3)T2             |                       |
      |------------+-----------------------+-----------------------|
      |            | Vulnerable; first     | Vulnerable; first     |
      | 15.1XB     | fixed in Release      | fixed in Release      |
      |            | 15.1T                 | 15.1T                 |
      |------------+-----------------------+-----------------------|
      |  Affected  |                       |  First Fixed Release  |
      | 15.2-Based |  First Fixed Release  | for All Advisories in |
      |  Releases  |   For This Advisory   |  the September 2011   |
      |            |                       |  Bundled Publication  |
      |------------------------------------------------------------|
      | There are no affected 15.2-based releases                  |
      +------------------------------------------------------------+
      
      Cisco IOS XE Software
      +--------------------
      
      Cisco IOS XE Software is affected by the vulnerability disclosed in
      this document.
      
      +------------------------------------------------------------+
      |  Cisco   |  First Fixed   |  First Fixed Release for All   |
      |  IOS XE  |  Release For   |  Advisories in the September   |
      | Release  | This Advisory  |    2011 Bundled Publication    |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.1.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.2.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.3.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.4.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.5.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 2.6.x    | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      | 3.1.xS   | 3.1.4S         | Vulnerable; migrate to 3.3.2S  |
      |          |                | or later                       |
      |----------+----------------+--------------------------------|
      | 3.1.xSG  | Not vulnerable | Vulnerable; migrate to 3.2.0SG |
      |          |                | or later                       |
      |----------+----------------+--------------------------------|
      |          | Vulnerable;    |                                |
      | 3.2.xS   | migrate to     | Vulnerable; migrate to 3.3.2S  |
      |          | 3.3.2S or      | or later                       |
      |          | later          |                                |
      |----------+----------------+--------------------------------|
      | 3.2.xSG  | Not vulnerable | Not vulnerable                 |
      |----------+----------------+--------------------------------|
      | 3.3.xS   | 3.3.2S         | 3.3.2S                         |
      |----------+----------------+--------------------------------|
      | 3.4.xS   | Not vulnerable | Not vulnerable                 |
      +------------------------------------------------------------+
      
      For mapping of Cisco IOS XE to Cisco IOS releases, please refer to
      the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and
      Cisco IOS XE 3SG Release Notes.
      
      Cisco IOS XR Software
      +--------------------
      
      Cisco IOS XR Software is not affected by the vulnerability disclosed
      in this document.
      
      Cisco IOS XR Software is not affected by any of the vulnerabilities
      in the September 2011 bundled publication.
      
      Workarounds
      ===========
      
      For both vulnerabilities the following workaround applies:
      
      Disabling MPLS TTL Propagation
      +-----------------------------
      
      Disabling MPLS TTL propagation will prevent exploitation of these
      vulnerabilities. MPLS TTL propagation will have to be disabled on all
      PE routers in the MPLS domain. To disable MPLS TTL propagation, enter
      the global configuration command "no mpls ip propagate-ttl". If only "no
      mpls ip propagate-ttl forward" is configured, the vulnerabilities could
      still be exploited from within the MPLS domain.
      
      For more information about the MPLS TTL propagation command, refer to
      the configuration guide at:
      
      http://www.cisco.com/en/US/docs/ios/mpls/command/reference/mp_m1.html#wp1013846
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address these
      vulnerabilities. Prior to deploying software, customers should
      consult their maintenance provider or check the software for feature
      set compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature
      sets they have purchased. By installing, downloading, accessing
      or otherwise using such software upgrades, customers agree to be
      bound by the terms of Cisco's software license terms found at
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
      or as otherwise set forth at Cisco.com Downloads at
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
      
      Do not contact psirt at cisco dot com or security-alert at cisco dot com for
      software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com.
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreements with third-party support organizations,
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of entitlement to
      a free upgrade. Free upgrades for non-contract customers must be
      requested through the TAC.
      
      Refer to http://www.cisco.com/en/US/support/
      tsd_cisco_worldwide_contacts.html for additional TAC contact
      information, including localized telephone numbers, and instructions
      and e-mail addresses for use in various languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerabilities described in this advisory.
      
      These vulnerabilities were discovered when handling customer support
      calls.
      
      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-20110928-ipv6mpls.shtml
      
      In addition to worldwide web posting, a text version of this notice
      is clear-signed with the Cisco PSIRT PGP key and is posted to the
      following e-mail and Usenet news recipients.
      
        * cust-security-announce at cisco dot com
        * first-bulletins at lists dot first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot com
      
      Future updates of this advisory, if any, will be placed on Cisco's
      worldwide website, but may or may not be actively announced on
      mailing lists or newsgroups. Users concerned about this problem are
      encouraged to check the above URL for any updates.
      
      Revision History
      ================
      
      +------------------------------------------------------------+
      | Revision 1.0 | 2011-September-28 | Initial public release  |
      +------------------------------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities
      in Cisco products, obtaining assistance with security
      incidents, and registering to receive security information
      from Cisco, is available on Cisco's worldwide website at
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
      This includes instructions for press inquiries regarding
      Cisco security notices. All Cisco security advisories are available at
      http://www.cisco.com/go/psirt.
      
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      Copyright 2010-2011 Cisco Systems, Inc. All rights reserved.
      +--------------------------------------------------------------------
      
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