[apops] Cisco Security Advisory: Cisco IOS MPLS VPN May Leak Information

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS MPLS VPN May Leak Information
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Sep 2008 17:50:00 +0200
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      Cisco Security Advisory: Cisco IOS MPLS VPN May Leak Information
      
      Advisory ID: cisco-sa-20080924-vpn
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
      
      Revision 1.0
      
      For Public Release 2008 September 24 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Devices running Cisco IOS versions 12.0S, 12.2, 12.3 or 12.4 and
      configured for Multiprotocol Label Switching (MPLS) Virtual Private
      Networks (VPNs) or VPN Routing and Forwarding Lite (VRF Lite) and
      using Border Gateway Protocol (BGP) between Customer Edge (CE) and
      Provider Edge (PE) devices may permit information to propagate
      between VPNs.
      
      Workarounds are available to help mitigate this vulnerability.
      
      This issue is triggered by a logic error when processing extended
      communities on the PE device.
      
      This issue cannot be deterministically exploited by an attacker.
      
      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-20080924-vpn.shtml
      
      NOTE: The September 24, 2008 IOS Advisory bundled publication
      includes twelve Security Advisories. Eleven of the advisories address
      vulnerabilities in Cisco's IOS software, and one advisory addresses
      vulnerabilities in Cisco Unified Communications Manager. Each
      Advisory lists the releases that correct the vulnerability described
      in the Advisory. Please reference the following software table to
      find a release that fixes all published IOS software Advisories as of
      September 24th, 2008:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml
      
      Individual publication links are listed below:
      
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml
      
      Affected Products
      =================
      
      Products running Cisco IOS versions 12.0S, 12.2, 12.3 or 12.4 and
      configured for MPLS VPNs or VRF Lite are potentially affected.
      
      Cisco IOS releases based on 12.1 are not affected.
      
      Vulnerable Products
      +------------------
      
      Cisco IOS devices are vulnerable if they are configured for MPLS VPN
      or VRF Lite and have a BGP session between the CE and PE devices, and
      process extended communities. If a device is configured for MPLS VPN
      or VRF Lite the command address-family ipv4 vrf <vrf-name> or
      address-family ipv6 vrf <vrf-name> will be present in the device
      configuration.
      
      The following shows a command executed on a device configured for
      MPLS VPN:
      
          router#show running-config | include address-family [ipv4|ipv6]
      
          address-family ipv4 vrf <vrf-name>
      
      The following shows a PE device configured for an IPv4 BGP session
      between the PE and the CE:
      
          router bgp <Local AS>
           address-family ipv4 vrf one
           neighbor <neighbor IP> remote-as < Remote AS>
           neighbor <neighbor IP> activate
      
      To determine the 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 that is running
      Cisco IOS release 12.4(11)T2:
      
          Router#show version
          Cisco IOS Software, 7200 Software (C7200-ADVSECURITYK9-M), Version 12.4(11)T2, RELEASE SOFTWARE (fc4)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2007 by Cisco Systems, Inc.
          Compiled Tue 01-May-07 04:19 by prod_rel_team
      
          <output truncated>
      
      Additional information on the Cisco IOS release naming conventions
      can be found on the document entitled "White Paper: Cisco IOS
      Reference Guide", which is available at 
      http://www.cisco.com/warp/public/620/1.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco products not configured for MPLS VPNs or VRF Lite are
      unaffected by this vulnerability.
      
      Cisco products that do not run IOS are unaffected by this
      vulnerability.
      
      Cisco IOS-XR is not affected.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      MPLS VPNs allow for the creation of 'virtual networks' that customers
      can use to segregate traffic into multiple, isolated VPNs. Traffic
      within each MPLS VPN is kept separate from the others, thereby
      maintaining a virtual private network.
      
      More information on MPLS and MPLS VPNs is available at the following
      link:
      
      http://www.cisco.com/en/US/products/ps6557/products_ios_technology_home.html
      
      A bug exists when processing extended communities with MPLS VPNs. If
      extended communities are used, MPLS VPN may incorrectly use a
      corrupted route target (RT) to forward traffic. If this occurs,
      traffic can leak from one MPLS VPN to another.
      
      This vulnerability exists whenever an affected PE device has a BGP
      session running in the MPLS VPN Virtual Routing and Forwarding (VRF).
      The following two examples of this scenario are the most common:
      
      1) MPLS VPN configuration with BGP running inside the VRF between the
      PE and CE devices.
      
      2) MPLS Inter-AS option A with BGP running between the Autonomous
      System Border Routers (ASBR).
      
      The mitigation in the Workarounds section filters extended
      communities on a PE device, preventing them from being received by
      devices configured for MPLS VPN.
      
      This vulnerability was introduced with Cisco bug ID CSCee83237. Cisco
      IOS images that do not include CSCee83237 are not vulnerable to this
      issue.
      
      It is important to note that this condition cannot be triggered by an
      attacker and that the condition does not provide ways to determine
      the flow of traffic between VPNs.
      
      This vulnerability is documented in the Cisco Bug ID CSCec12299 
      and has been assigned Common Vulnerabilities and Exposures (CVE) ID
      CVE-2008-3803.
      
      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 
      
      
      CVSS Base Score - 5.1
      
              Access Vector          - Network
              Access Complexity      - High
              Authentication         - None
              Confidentiality Impact - Partial
              Integrity Impact       - Partial
              Availability Impact    - Partial
      
      CVSS Temporal Score - 4.2
      
              Exploitability          - Functional
              Remediation Level       - Official-Fix
              Report Confidence       - Confirmed
      
      
      Impact
      ======
      
      This vulnerability may cause traffic to be improperly routed between
      MPLS VPNs, which may lead to a breach of confidentiality.
      
      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 Releases          |
      |   Release    |                                                    |
      |--------------+----------------------------------------------------|
      |   Affected   |                                  |   Recommended   |
      |  12.0-Based  |       First Fixed Release        |     Release     |
      |   Releases   |                                  |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0         | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0DA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0DB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0DC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              | 12.0(30)S5                       |                 |
      |              |                                  | 12.0(32)S11     |
      | 12.0S        | 12.0(31)S3                       |                 |
      |              |                                  | 12.0(33)S1      |
      |              | 12.0(32)S                        |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0SC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0SL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0SP       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0ST       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.0(32)S11     |
      | 12.0SX       | Vulnerable; first fixed in 12.0S |                 |
      |              |                                  | 12.0(33)S1      |
      |--------------+----------------------------------+-----------------|
      | 12.0SY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.0(32)S11     |
      | 12.0SZ       | 12.0(30)SZ4                      |                 |
      |              |                                  | 12.0(33)S1      |
      |--------------+----------------------------------+-----------------|
      | 12.0T        | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0W        | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0WC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0WT       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XE       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XH       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XI       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XJ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XM       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XN       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XQ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XS       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XT       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.0XV       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |   Affected   |                                  |   Recommended   |
      |  12.1-Based  |       First Fixed Release        |     Release     |
      |   Releases   |                                  |                 |
      |-------------------------------------------------------------------|
      | There are no affected 12.1 based releases                         |
      |-------------------------------------------------------------------|
      |   Affected   |                                  |   Recommended   |
      |  12.2-Based  |       First Fixed Release        |     Release     |
      |   Releases   |                                  |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2         | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2B        | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2BC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2BW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2BX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2BY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2BZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2CX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2CY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2CZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2DA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2DD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2DX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2EW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2EWA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2EX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2EY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2EZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2FX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2FY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2FZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IRB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXA      | Vulnerable; migrate to any       | 12.2(18)IXG     |
      |              | release in 12.2IXD               |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXB      | Vulnerable; migrate to any       | 12.2(18)IXG     |
      |              | release in 12.2IXD               |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXC      | Vulnerable; migrate to any       | 12.2(18)IXG     |
      |              | release in 12.2IXD               |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXD      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXE      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXF      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2IXG      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2JA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2JK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2MB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2MC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              | 12.2(30)S and later are          | 12.2(33)SB2;    |
      | 12.2S        | vulnerable. 12.2(25)S and before | Available on    |
      |              | are not vulnerable               | 26-SEP-08       |
      |--------------+----------------------------------+-----------------|
      |              | 12.2(28)SB5                      |                 |
      |              |                                  | 12.2(33)SB2;    |
      | 12.2SB       | 12.2(31)SB2                      | Available on    |
      |              |                                  | 26-SEP-08       |
      |              | 12.2(31)SB3x                     |                 |
      |--------------+----------------------------------+-----------------|
      |              | Vulnerable; first fixed in       | 12.2(33)SB2;    |
      | 12.2SBC      | 12.2SB                           | Available on    |
      |              |                                  | 26-SEP-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(37)SG                       | 12.2(46)SG1     |
      |--------------+----------------------------------+-----------------|
      | 12.2SGA      | 12.2(31)SGA8                     | 12.2(31)SGA8    |
      |--------------+----------------------------------+-----------------|
      | 12.2SL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SM       | 12.2(29)SM2                      | 12.2(29)SM4     |
      |--------------+----------------------------------+-----------------|
      | 12.2SO       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SRA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SRB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SRC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SV       | 12.2(29b)SV1                     |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SVA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SVC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SVD      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SXA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SXB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SXD      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SXE      | Vulnerable; first fixed in       | 12.2(18)SXF15   |
      |              | 12.2SXF                          |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SXF      | 12.2(18)SXF3                     | 12.2(18)SXF15   |
      |--------------+----------------------------------+-----------------|
      | 12.2SXH      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2SZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2T        | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2TPC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XE       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XH       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XI       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XJ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XM       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XN       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XNA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XNB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XO       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XQ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XS       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XT       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XV       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2XW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YE       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YH       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YJ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YM       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YN       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YO       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YP       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YQ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YS       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YT       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YV       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2YZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZE       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZH       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZJ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZP       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              | Vulnerable; first fixed in       | 12.2(33)SB2;    |
      | 12.2ZX       | 12.2SB                           | Available on    |
      |              |                                  | 26-SEP-08       |
      |--------------+----------------------------------+-----------------|
      | 12.2ZY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.2ZYA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |   Affected   |                                  |   Recommended   |
      |  12.3-Based  |       First Fixed Release        |     Release     |
      |   Releases   |                                  |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3         | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3B        | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3BC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3BW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3EU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JEA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JEB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JEC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3JX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.4(15)T7      |
      | 12.3T        | Vulnerable; first fixed in 12.4  |                 |
      |              |                                  | 12.4(18c)       |
      |--------------+----------------------------------+-----------------|
      | 12.3TPC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3VA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XB       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XC       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XE       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XI       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XJ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.4(15)T7      |
      | 12.3XL       | Vulnerable; first fixed in 12.4  |                 |
      |              |                                  | 12.4(18c)       |
      |--------------+----------------------------------+-----------------|
      | 12.3XQ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XS       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XU       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3XZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3YA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3YD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              | Vulnerable; first fixed in       | 12.3(14)YX13    |
      | 12.3YF       | 12.3YX                           |                 |
      |              |                                  | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.3YG       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3YH       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3YI       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3YJ       | Vulnerable; first fixed in 12.4T | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.3YK       | 12.3(11)YK3                      | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.3(14)YM13;   |
      | 12.3YM       | 12.3(14)YM10                     | Available on    |
      |              |                                  | 30-SEP-08       |
      |--------------+----------------------------------+-----------------|
      | 12.3YQ       | Vulnerable; first fixed in 12.4T | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.3YS       | 12.3(11)YS2                      | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.3YT       | Vulnerable; first fixed in 12.4T | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.4(2)XB10     |
      |              | Vulnerable; first fixed in       |                 |
      | 12.3YU       | 12.4XB                           | 12.4(9)XG3      |
      |              |                                  |                 |
      |              |                                  | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.3YX       | 12.3(14)YX7                      | 12.3(14)YX13    |
      |--------------+----------------------------------+-----------------|
      | 12.3YZ       | 12.3(11)YZ2                      |                 |
      |--------------+----------------------------------+-----------------|
      | 12.3ZA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |   Affected   |                                  |   Recommended   |
      |  12.4-Based  |       First Fixed Release        |     Release     |
      |   Releases   |                                  |                 |
      |--------------+----------------------------------+-----------------|
      |              | 12.4(10c)                        |                 |
      |              |                                  |                 |
      |              | 12.4(12a)                        |                 |
      |              |                                  |                 |
      |              | 12.4(13)                         |                 |
      |              |                                  |                 |
      | 12.4         | 12.4(3h)                         | 12.4(18c)       |
      |              |                                  |                 |
      |              | 12.4(5c)                         |                 |
      |              |                                  |                 |
      |              | 12.4(7e)                         |                 |
      |              |                                  |                 |
      |              | 12.4(8d)                         |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JA       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JK       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JMA      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JMB      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JMC      | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4JX       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4MD       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4MR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.4(15)SW2;    |
      | 12.4SW       | 12.4(11)SW1                      | Available on    |
      |              |                                  | 28-SEP-08       |
      |--------------+----------------------------------+-----------------|
      |              | 12.4(11)T2                       |                 |
      |              |                                  |                 |
      |              | 12.4(15)T                        |                 |
      |              |                                  |                 |
      |              | 12.4(2)T6                        |                 |
      | 12.4T        |                                  | 12.4(15)T7      |
      |              | 12.4(4)T8                        |                 |
      |              |                                  |                 |
      |              | 12.4(6)T7                        |                 |
      |              |                                  |                 |
      |              | 12.4(9)T3                        |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XA       | Vulnerable; first fixed in 12.4T | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.4XB       | 12.4(2)XB6                       | 12.4(2)XB10     |
      |--------------+----------------------------------+-----------------|
      | 12.4XC       | 12.4(4)XC7                       | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      |              |                                  | 12.4(4)XD11;    |
      | 12.4XD       | 12.4(4)XD7                       | Available on    |
      |              |                                  | 26-SEP-08       |
      |--------------+----------------------------------+-----------------|
      | 12.4XE       | 12.4(6)XE3                       | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.4XF       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XG       | 12.4(9)XG2                       | 12.4(9)XG3      |
      |--------------+----------------------------------+-----------------|
      | 12.4XJ       | 12.4(11)XJ2                      | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.4XK       | Vulnerable; first fixed in 12.4T | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.4XL       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XM       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XN       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XP       | Vulnerable; contact TAC          |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XQ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XR       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XT       | 12.4(6)XT1                       | 12.4(15)T7      |
      |--------------+----------------------------------+-----------------|
      | 12.4XV       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XW       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XY       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4XZ       | Not Vulnerable                   |                 |
      |--------------+----------------------------------+-----------------|
      | 12.4YA       | Not Vulnerable                   |                 |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      Customers running versions of Cisco IOS that support filtering of
      extended communities can prevent the corruption of the route target
      (RT) by applying a BGP route-map that removes RT entries on inbound
      BGP sessions.
      
      The following configuration example applied in the ipv4 address
      family of a PE device removes extended communities from the CE
      router:
      
          router bgp <Local AS>
           address-family ipv4 vrf one
           neighbor <neighbor IP>
           remote-as <Remote AS>
           neighbor <neighbor IP>
           activate neighbor <neighbor IP>
           route-map FILTER in exit-address-family
           !
          ip extcommunity-list 100 permit _RT.*_
          !
          !
          route-map FILTER permit 10
           set extcomm-list 100 delete
          !
      
      The following configuration example applied in the ipv6 address
      family of a PE device removes extended communities from the CE
      router:
      
          router bgp <Local AS>
           address-family ipv6 vrf one
           neighbor <neighbor IP>
           remote-as <Remote AS>
           neighbor <neighbor IP>
           activate neighbor <neighbor IP>
           route-map FILTER in exit-address-family
          !
          ip extcommunity-list 100 permit _RT.*_
          !
          !
          route-map FILTER permit 10
           set extcomm-list 100 delete
          !
      
      Note: The capability of filtering extended communities is only
      available in certain 12.0S and 12.2S based Cisco IOS releases.
      
      BGP session between the PE and the CE needs to cleared to make this
      configuration change effective.
      
      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.
      
      This vulnerability was reported to Cisco by a customer.
      
      This vulnerability cannot be deterministically triggered by an
      attacker.
      
      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-20080924-vpn.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 |             | Initial      |
      | 1.0      | 2008-Sep-24 | 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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