[apops] Cisco Security Advisory: Cisco IOS MPLS Forwarding Infrastructur

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS MPLS Forwarding Infrastructure Denial of Service Vulnerability
  • 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 Forwarding Infrastructure
      Denial of Service Vulnerability
      
      Advisory ID: cisco-sa-20080924-mfi
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
      
      Revision 1.0
      
      For Public Release 2008 September 24 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS Software Multi Protocol Label Switching (MPLS) Forwarding
      Infrastructure (MFI) is vulnerable to a Denial of Service (DoS)
      attack from specially crafted packets. Only the MFI is affected by
      this vulnerability. Older Label Forwarding Information Base (LFIB)
      implementation, which is replaced by MFI, is not affected.
      
      Cisco has released free software updates that address this
      vulnerability.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.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-vpn.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
      =================
      
      Devices that run Cisco IOS software (including those that support
      Cisco IOS Software Modularity) and support MFI are affected if they
      are configured for MPLS.
      
      Vulnerable Products
      +------------------
      
      A device that runs Cisco IOS software and supports MFI will have
      mfi_ios in the output of the show subsys command. The following
      example shows output from a device that supports MFI:
      
          Router#show subsys name mfi_ios
                       Class         Version
          mfi_ios      Protocol    1.000.001
          Router#
      
      The following example shows output from a device that is configured
      for MPLS:
      
          Router#show mpls interface
          Interface      IP           Tunnel  BGP Static Operational
          Ethernet0/0    Yes (ldp)    No      No  No     Yes
          Router#
      
      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
      +--------------------------------
      
      Devices running Cisco IOS software versions that do not include MFI
      are not vulnerable.
      
      Devices that are not configured for MPLS are not vulnerable.
      
      Devices that are running Cisco IOS XR software are not vulnerable.
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details 
      =======
      
      In newer versions of Cisco IOS software, a new packet forwarding
      infrastructure was introduced to improve scalability and performance.
      This forwarding infrastructure, called MFI, is transparent to the
      user. MFI manages MPLS data structures used for forwarding and
      replaces the older implementation, Label Forwarding Information Base
      (LFIB). Cisco IOS MFI implementation is vulnerable to a DoS attack
      from specially crafted packets that are handled in the software path,
      including transit packets that are handled in the software path. Such
      packets can be sent from the local segment to the interfaces that are
      configured for MPLS or via tunnel interfaces that are configured for
      MPLS. To target a remote system in an MPLS network, an attacker needs
      to have access to the MPLS network through an MPLS-enabled interface.
      MPLS packets are dropped on interfaces that are not configured for
      MPLS.
      
      Devices that support MFI will have mfi_ios in the output of the show
      subsys command. Interfaces that are enabled for MPLS can be seen by
      the show mpls interface command.
      
      More information on MFI can be found at the following link:
      
      http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_lsc_removed.html
      
      This vulnerability is documented in the Cisco Bug ID CSCsk93241 
      and has been assigned Common Vulnerabilities and Exposures (CVE) 
      ID CVE-2008-3804.
      
      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
      
      CSCsk93241 - Chunk memory corruption on LFDp Input Proc
      
      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 this vulnerability may result in the
      reload of the device, leading to a DoS condition.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, also consult 
      http://www.cisco.com/go/psirt and any subsequent advisories to
      determine exposure and a complete upgrade solution.
      
      In all cases, customers should exercise caution to be certain the
      devices to be upgraded contain sufficient memory and that current
      hardware and software configurations will continue to be supported
      properly by the new release. If the information is not clear, contact
      the Cisco Technical Assistance Center (TAC) or your contracted
      maintenance provider for assistance.
      
      Each row of the Cisco IOS software table (below) names a Cisco IOS
      release train. If a given release train is vulnerable, then the
      earliest possible releases that contain the fix (along with the
      anticipated date of availability for each, if applicable) are listed
      in the "First Fixed Release" column of the table. The "Recommended
      Release" column indicates the releases which have fixes for all the
      published vulnerabilities at the time of this Advisory. A device
      running a release in the given train that is earlier than the release
      in a specific column (less than the First Fixed Release) is known to
      be vulnerable. Cisco recommends upgrading to a release equal to or
      later than the release in the "Recommended Releases" column of the
      table.
      
      +-------------------------------------------------------------------+
      |   Major    |          Availability of Repaired Releases           |
      |  Release   |                                                      |
      |------------+------------------------------------------------------|
      |  Affected  |                                      |  Recommended  |
      | 12.0-Based |         First Fixed Release          |    Release    |
      |  Releases  |                                      |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.0 based releases                         |
      |-------------------------------------------------------------------|
      |  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     | 12.2(44)EY; Available on 16-DEC-08   |               |
      |------------+--------------------------------------+---------------|
      | 12.2EZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2FX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2FY     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2FZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2IRB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2IXA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2IXB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2IXC    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      |            | Releases prior to 12.2(22)S are not  |               |
      |            | vulnerable.                          |               |
      |            |                                      | 12.2(33)SB2;  |
      | 12.2S      | Release 12.2(22)S and later and      | Available on  |
      |            | prior to 12.2(30)S are vulnerable,   | 26-SEP-08     |
      |            |                                      |               |
      |            | release 12.2(30)S and later are not  |               |
      |            | vulnerable                           |               |
      |------------+--------------------------------------+---------------|
      |            | 12.2(31)SB12                         | 12.2(33)SB2;  |
      | 12.2SB     |                                      | Available on  |
      |            | 12.2(33)SB                           | 26-SEP-08     |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.2(33)SB2;  |
      | 12.2SBC    | Vulnerable; first fixed in 12.2SB    | Available on  |
      |            |                                      | 26-SEP-08     |
      |------------+--------------------------------------+---------------|
      | 12.2SCA    | 12.2(33)SCA1                         | 12.2(33)SCA1  |
      |------------+--------------------------------------+---------------|
      |            | 12.2(44)SE3; Available on 30-SEP-08  |               |
      | 12.2SE     |                                      | 12.2(46)SE    |
      |            | 12.2(46)SE                           |               |
      |------------+--------------------------------------+---------------|
      | 12.2SEA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SEB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SEC    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SED    | Vulnerable; first fixed in 12.2SE    | 12.2(46)SE    |
      |------------+--------------------------------------+---------------|
      | 12.2SEE    | Vulnerable; first fixed in 12.2SE    | 12.2(46)SE    |
      |------------+--------------------------------------+---------------|
      | 12.2SEF    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            | Note: Releases prior to 12.2(25)SEG4 |               |
      | 12.2SEG    | are vulnerable, release 12.2(25)SEG4 | 12.2(25)SEG6  |
      |            | and later are not vulnerable;        |               |
      |------------+--------------------------------------+---------------|
      | 12.2SG     | 12.2(50)SG; Available on 24-NOV-08   | 12.2(46)SG1   |
      |------------+--------------------------------------+---------------|
      | 12.2SGA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SM     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SO     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.2(33)SRB4  |
      | 12.2SRA    | Vulnerable; first fixed in 12.2SRB   |               |
      |            |                                      | 12.2(33)SRC2  |
      |------------+--------------------------------------+---------------|
      | 12.2SRB    | 12.2(33)SRB4                         | 12.2(33)SRB4  |
      |------------+--------------------------------------+---------------|
      | 12.2SRC    | 12.2(33)SRC1                         | 12.2(33)SRC2  |
      |------------+--------------------------------------+---------------|
      | 12.2SU     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SV     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.2SVA    | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.2SVC    | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.2SVD    | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      |            | Note: Releases prior to 12.2(25)SW4  |               |
      | 12.2SW     | are vulnerable, release 12.2(25)SW4  | 12.2(25)SW12  |
      |            | and later are not vulnerable;        |               |
      |------------+--------------------------------------+---------------|
      | 12.2SX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXD    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXE    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXF    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.2SXH    | 12.2(33)SXH3                         | 12.2(33)SXH3  |
      |------------+--------------------------------------+---------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.2(33)SB2;  |
      |            |                                      | Available on  |
      |            |                                      | 26-SEP-08     |
      | 12.2XN     | Vulnerable; first fixed in 12.2SB    |               |
      |            |                                      | 12.2(33)SRC2  |
      |            |                                      |               |
      |            |                                      | 12.2(33)XNA2  |
      |------------+--------------------------------------+---------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.2(33)SB2;  |
      | 12.2ZX     | Vulnerable; first fixed in 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  |                                      |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.3 based releases                         |
      |-------------------------------------------------------------------|
      |  Affected  |                                      |  Recommended  |
      | 12.4-Based |         First Fixed Release          |    Release    |
      |  Releases  |                                      |               |
      |------------+--------------------------------------+---------------|
      | 12.4       | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 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                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4SW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4T      | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XB     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XC     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XD     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XE     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XF     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XJ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XM     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XN     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XP     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XQ     | 12.4(15)XQ1                          | 12.4(15)XQ1   |
      |------------+--------------------------------------+---------------|
      | 12.4XR     | Vulnerable; migrate to any release   | 12.4(15)T7    |
      |            | in 12.4T                             |               |
      |------------+--------------------------------------+---------------|
      | 12.4XT     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XV     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XY     | 12.4(15)XY4                          | 12.4(15)XY4   |
      |------------+--------------------------------------+---------------|
      | 12.4XZ     | 12.4(15)XZ1                          | 12.4(15)XZ2   |
      |------------+--------------------------------------+---------------|
      | 12.4YA     | Not Vulnerable                       |               |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      MPLS is normally enabled on physical and logical interfaces that are
      shared with other MPLS-enabled devices. It can be disabled on
      interfaces where MPLS is not necessary and from which a potential
      attack can be launched. This action may help to limit the exposure of
      this vulnerability.
      
      If it is not possible to disable MPLS on interfaces from which an
      attack can be launched, there are no workarounds to mitigate this
      vulnerability.
      
      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 found internally.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
      KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
      INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
      AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
      DOCUMENT AT ANY TIME.
      
      A stand-alone copy or Paraphrase of the text of this document that
      omits the distribution URL in the following section is an
      uncontrolled copy, and may lack important information or contain
      factual errors.
      
      Distribution
      ============
      
      This advisory is posted on Cisco's worldwide website at :
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.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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