[apops] Cisco Security Advisory: Cisco IOS Multicast Virtual Private Net

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 26 Mar 2008 17:00:00 +0100
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      Cisco Security Advisory: Cisco IOS Multicast Virtual Private Network
                               (MVPN) Data Leak
      
      Advisory ID: cisco-sa-20080326-mvpn
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
      
      Revision 1.0
      
      For Public Release 2008 March 26 1600 UTC (GMT)
      
      Summary
      =======
      
      A vulnerability in the Cisco implementation of Multicast Virtual
      Private Network (MVPN) is subject to exploitation that can allow a
      malicious user to create extra multicast states on the core routers
      or receive multicast traffic from other Multiprotocol Label Switching
      (MPLS) based Virtual Private Networks (VPN) by sending specially
      crafted messages.
      
      Cisco has released free software updates that address this
      vulnerability. Workarounds that mitigate this vulnerability are
      available.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
      
      Note: The March 26, 2008 publication includes five Security
      Advisories. The Advisories all affect Cisco IOS. Each Advisory lists
      the releases that correct the vulnerability described in the
      Advisory, and the Advisories also detail the releases that correct
      the vulnerabilities in all five Advisories. Please reference the
      following software table to find a release that fixes all published
      Security Advisories as of March 26th, 2008.
      
        * March 26th bundled IOS Advisory Table
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-bundle.shtml
      
      Individual publication links are listed below:
      
        * Cisco IOS Virtual Private Dial-up Network Denial of Service
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
      
        * Multiple DLSw Denial of Service Vulnerabilities in Cisco IOS
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
      
        * Cisco IOS User Datagram Protocol Delivery Issue For IPv4/IPv6
          Dual-stack Routers
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
      
        * Vulnerability in Cisco IOS with OSPF, MPLS VPN, and Supervisor
          32, Supervisor 720, or Route Switch Processor 720
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-queue.shtml
      
        * Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak
          http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
      
      Affected Products
      =================
      
      Vulnerable Products
      +------------------
      
      Devices that run Cisco IOS and are configured for MVPN are affected.
      
      An IOS device that is configured for MVPN has a line that is similar
      to this in the running configuration example:
      
          mdt default <group-address>
      
      In order to determine the software that runs on a Cisco IOS product,
      log in to the device and issue the show version command to display
      the system banner. Cisco IOS® software identifies itself as
      "Internetwork Operating System Software" or simply "IOS." On the next
      line of output, the image name displays between parentheses, followed
      by "Version" and the Cisco IOS release name. Other Cisco devices do
      not have the "show version" command or give different output.
      
      The following example shows output from a device that runs an IOS
      image:
      
          Router>show version
              Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3(14)T1, RELEASE SOFTWARE (fc1)
              Technical Support: http://www.cisco.com/techsupport
              Copyright (c) 1986-2005 by Cisco Systems, Inc.
              Compiled Thu 31-Mar-05 08:04 by yiyan
      
      Additional information about Cisco IOS release naming is available at
      the following link: 
      http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      No other Cisco products, including IOS XR software, are currently
      known to be affected by this vulnerability.
      
      Details
      =======
      
      MVPN architecture introduces an additional set of protocols and
      procedures that help enable a service provider to support multicast
      traffic in an MPLS VPN. MVPN allows the transparent transport of IP
      multicast traffic across the MPLS VPN backbone of a provider and
      allows a service provider to offer multicast services to MPLS VPN
      customers.
      
      A vulnerability exists in the implementation of MVPN that allows an
      attacker to send specially crafted Multicast Distribution Tree (MDT)
      Data Join messages that can cause the creation of extra multicast
      states on the core routers. MDT Data Join messages can be sent in
      unicast or multicast. The vulnerability can also allow leaking
      multicast traffic from different MPLS VPNs. It is possible to receive
      multicast traffic from VPNs that are not connected to the same
      Provider Edge (PE) router. In order to successfully exploit this
      vulnerability, an attacker needs to know or guess the Border Gateway
      Protocol (BGP) peering IP address of a remote PE router and the
      address of the multicast group that is used in other MPLS VPNs.
      
      This vulnerability is documented in the Cisco Bug ID CSCsi01470 
      and has been assigned Common Vulnerabilities and Exposures (CVE) ID 
      CVE-2008-1156.
      
      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 
      
      CSCsi01470 - Crafted MDT Data Join TLV in VRF causes multicast state
      
        CVSS Base Score - 7.5
      
        Access Vector:          Network
        Access Complexity:      Low
        Authentication:         None
      
        Confidentiality Impact: Partial
        Integrity Impact:       Partial
        Availability Impact:    Partial
      
        CVSS Temporal Score - 6.2
      
        Exploitability:         Functional
        Remediation Level:      Official-Fix
        Report Confidence:      Confirmed
      
      Impact
      ======
      
      Successful exploitation of the vulnerability can result in the
      creation of extra multicast states on the core routers or the leaking
      of multicast traffic from one MPLS VPN to another.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, also consult 
      http://www.cisco.com/go/psirt and any subsequent advisories to 
      determine exposure and a complete upgrade solution.
      
      In all cases, customers should exercise caution to be certain the
      devices to be upgraded contain sufficient memory and that current
      hardware and software configurations will continue to be supported
      properly by the new release. If the information is not clear, contact
      the Cisco Technical Assistance Center (TAC) or your contracted
      maintenance provider for assistance.
      
      Each row of the Cisco IOS software table (below) names a Cisco IOS
      release train. If a given release train is vulnerable, then the
      earliest possible releases that contain the fix (along with the
      anticipated date of availability for each, if applicable) are listed
      in the "First Fixed Release" column of the table. The "Recommended
      Release" column indicates the releases which have fixes for all the
      published vulnerabilities at the time of this Advisory. A device
      running a release in the given train that is earlier than the release
      in a specific column (less than the First Fixed Release) is known to
      be vulnerable. Cisco recommends upgrading to a release equal to or
      later than the release in the "Recommended Releases" column of the
      table.
      
      +----------------------------------------+
      |   Major    | Availability of Repaired  |
      |  Release   |         Releases          |
      |------------+---------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.0-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.0       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0DC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 12.0(32)S9  |             |
      | 12.0S      |             | 12.0(32)S10 |
      |            | 12.0(33)S   |             |
      |------------+-------------+-------------|
      | 12.0SC     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0SP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0ST     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.0SX     | first fixed | 12.0(32)S10 |
      |            | in 12.0S    |             |
      |------------+-------------+-------------|
      | 12.0SY     | 12.0(32)SY4 | 12.0(32)SY5 |
      |------------+-------------+-------------|
      | 12.0SZ     | 12.0(30)SZ4 | 12.0(32)S10 |
      |------------+-------------+-------------|
      | 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  |             |
      |------------+-------------+-------------|
      | 12.0XV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.0XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.1-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |----------------------------------------|
      |    There are no affected 12.1 based    |
      |                releases                |
      |----------------------------------------|
      |  Affected  | First Fixed | Recommended |
      | 12.2-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      | 12.2       | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BC     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      | 12.2BW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2BY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2BZ     | first fixed |             |
      |            | in 12.3XI   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2CX     | first fixed | 12.3(23)BC1 |
      |            | in 12.3BC   |             |
      |------------+-------------+-------------|
      | 12.2CY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2CZ     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      | 12.2DA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2DD     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2DX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)    |
      |            |             | EWA13       |
      |            | Vulnerable; |             |
      | 12.2EU     | first fixed | 12.2(31)    |
      |            | in 12.2SG   | SGA5        |
      |            |             |             |
      |            |             | 12.2(44)SG  |
      |------------+-------------+-------------|
      |            |             | 12.2(25)    |
      |            |             | EWA13       |
      |            | Vulnerable; |             |
      | 12.2EW     | first fixed | 12.2(31)    |
      |            | in 12.2SG   | SGA5        |
      |            |             |             |
      |            |             | 12.2(44)SG  |
      |------------+-------------+-------------|
      |            | 12.2(25)    |             |
      |            | EWA10       | 12.2(25)    |
      | 12.2EWA    |             | EWA13       |
      |            | 12.2(25)    |             |
      |            | EWA11       |             |
      |------------+-------------+-------------|
      | 12.2EX     | 12.2(37)EX  | 12.2(40)EX1 |
      |------------+-------------+-------------|
      | 12.2EY     | 12.2(37)EY  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2EZ     | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      | 12.2FX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2FY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2FZ     | first fixed | 12.2(44)SE1 |
      |            | in 12.2SE   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2IXA    | first fixed |             |
      |            | in 12.2IXD  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2IXB    | first fixed |             |
      |            | in 12.2IXD  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2IXC    | first fixed |             |
      |            | in 12.2IXD  |             |
      |------------+-------------+-------------|
      | 12.2IXD    | 12.2(18)    |             |
      |            | IXD1        |             |
      |------------+-------------+-------------|
      | 12.2IXE    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2JK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2MC     | 12.2(15)    | 12.4(18a)   |
      |            | MC2h        |             |
      |------------+-------------+-------------|
      |            | 12.2(14)S18 |             |
      |            |             |             |
      |            | 12.2(18)S13 |             |
      | 12.2S      |             | 12.2(25)S15 |
      |            | 12.2(20)S14 |             |
      |            |             |             |
      |            | 12.2(25)S13 |             |
      |------------+-------------+-------------|
      |            | 12.2(28)SB7 |             |
      |            |             |             |
      |            | 12.2(31)SB5 |             |
      | 12.2SB     |             | 12.2(28)    |
      |            | 12.2(33)SB; | SB12        |
      |            | Available   |             |
      |            | on          |             |
      |            | 31-MAR-08   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed |             |
      | 12.2SBC    | in 12.2SB;  | 12.2(28)    |
      |            | Available   | SB12        |
      |            | on          |             |
      |            | 31-MAR-08   |             |
      |------------+-------------+-------------|
      | 12.2SCA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | 12.2(35)SE4 |             |
      | 12.2SE     |             | 12.2(44)SE1 |
      |            | 12.2(37)SE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEA    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEB    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SEC    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SED    | first fixed |             |
      |            | in 12.2SEE  |             |
      |------------+-------------+-------------|
      | 12.2SEE    | 12.2(25)    |             |
      |            | SEE4        |             |
      |------------+-------------+-------------|
      | 12.2SEF    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SEG    | 12.2(25)    | 12.2(25)    |
      |            | SEG3        | SEG4        |
      |------------+-------------+-------------|
      |            | 12.2(25)SG2 |             |
      |            |             |             |
      |            | 12.2(31)SG2 |             |
      | 12.2SG     |             | 12.2(44)SG  |
      |            | 12.2(37)SG1 |             |
      |            |             |             |
      |            | 12.2(40)SG  |             |
      |------------+-------------+-------------|
      |            | 12.2(31)    |             |
      |            | SGA2        |             |
      |            |             |             |
      |            | 12.2(31)    |             |
      |            | SGA3        | 12.2(31)    |
      | 12.2SGA    |             | SGA5        |
      |            | 12.2(31)    |             |
      |            | SGA6;       |             |
      |            | Available   |             |
      |            | on          |             |
      |            | 07-APR-08   |             |
      |------------+-------------+-------------|
      | 12.2SL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SM     | 12.2(29)SM2 |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SO     | migrate to  | 12.2(29)SVD |
      |            | any release |             |
      |            | in 12.2SVA  |             |
      |------------+-------------+-------------|
      | 12.2SRA    | 12.2(33)    | 12.2(33)    |
      |            | SRA4        | SRA7        |
      |------------+-------------+-------------|
      |            |             | 12.2(33)    |
      |            | 12.2(33)    | SRB3;       |
      | 12.2SRB    | SRB1        | Available   |
      |            |             | on          |
      |            |             | 31-MAR-08   |
      |------------+-------------+-------------|
      | 12.2SRC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2SU     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2SV     | 12.2(29b)SV | 12.2(29b)SV |
      |------------+-------------+-------------|
      | 12.2SVA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SVD    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2SW     | 12.2(25)    |             |
      |            | SW11        |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SX     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXA    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXB    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXD    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SXE    | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            | 12.2(18)    |             |
      |            | SXF10       |             |
      |            |             |             |
      | 12.2SXF    | 12.2(18)    | 12.2(18)    |
      |            | SXF10a      | SXF13       |
      |            |             |             |
      |            | 12.2(18)    |             |
      |            | SXF12a      |             |
      |------------+-------------+-------------|
      | 12.2SXH    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2SY     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2SZ     | first fixed | 12.2(28)    |
      |            | in 12.2S    | SB12        |
      |            |             |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2T      | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2TPC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      |            | first fixed |             |
      | 12.2UZ     | in 12.2SB;  | 12.2(28)    |
      |            | Available   | SB12        |
      |            | on          |             |
      |            | 31-MAR-08   |             |
      |------------+-------------+-------------|
      | 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     | 12.2(33)XN1 | 12.3(26)    |
      |------------+-------------+-------------|
      | 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  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YH     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YJ     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      | 12.2YK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YL     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YM     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YN     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2YO     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.2YP     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YQ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YR     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2YS     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YT     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YU     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YV     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2YW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2YX     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2YY     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            |             | 12.2(25)S15 |
      |            | Vulnerable; |             |
      | 12.2YZ     | first fixed | 12.2(28)    |
      |            | in 12.2S    | SB12        |
      |            |             |             |
      |            |             | 12.2(33)SRC |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.2(18)    |
      | 12.2ZA     | first fixed | SXF13       |
      |            | in 12.2SXF  |             |
      |------------+-------------+-------------|
      | 12.2ZB     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZC     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.2ZD     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZE     | first fixed | 12.3(26)    |
      |            | in 12.3     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZF     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.2ZG     | first fixed |             |
      |            | in 12.3YG   | 12.4(18a)   |
      |------------+-------------+-------------|
      | 12.2ZH     | 12.2(13)ZH9 | 12.2(13)    |
      |            |             | ZH11        |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZJ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.2ZL     | first fixed |             |
      |            | in 12.4     | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZP     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.2ZU     | migrate to  | 12.2(33)    |
      |            | any release | SXH2        |
      |            | in 12.2SXH  |             |
      |------------+-------------+-------------|
      | 12.2ZY     | 12.2(18)ZY1 | 12.2(18)ZY2 |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.3-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | 12.3(17c)   |             |
      |            |             |             |
      |            | 12.3(18a)   |             |
      |            |             |             |
      |            | 12.3(19a)   |             |
      |            |             |             |
      | 12.3       | 12.3(20a)   | 12.3(26)    |
      |            |             |             |
      |            | 12.3(21b)   |             |
      |            |             |             |
      |            | 12.3(22a)   |             |
      |            |             |             |
      |            | 12.3(23)    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3B      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | 12.3(17b)   |             |
      |            | BC8         |             |
      |            |             |             |
      | 12.3BC     | 12.3(21a)   | 12.3(23)BC1 |
      |            | BC2         |             |
      |            |             |             |
      |            | 12.3(23)BC  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3BW     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3EU     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JEC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Releases    |             |
      |            | prior to    |             |
      |            | 12.3(8)JK1  |             |
      |            | are         |             |
      | 12.3JK     | vulnerable, | 12.3(8)JK1  |
      |            | release     |             |
      |            | 12.3(8)JK1  |             |
      |            | and later   |             |
      |            | are not     |             |
      |            | vulnerable; |             |
      |------------+-------------+-------------|
      | 12.3JL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.3JX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3T      | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3TPC    | 12.3(4)     |             |
      |            | TPC11b      |             |
      |------------+-------------+-------------|
      | 12.3VA     | Vulnerable; |             |
      |            | contact TAC |             |
      |------------+-------------+-------------|
      |            |             | 12.3(2)XA7; |
      | 12.3XA     | 12.3(2)XA6  | Available   |
      |            |             | on          |
      |            |             | 31-MAR-08   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XB     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.4(15)T4  |
      | 12.3XC     | 12.3(2)XC5  |             |
      |            |             | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XD     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.4(15)T4  |
      | 12.3XE     | 12.3(2)XE5  |             |
      |            |             | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XF     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.3XG     | first fixed |             |
      |            | in 12.3YG   | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XH     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      | 12.3XI     | 12.3(7)     |             |
      |            | XI10a       |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3XJ     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XK     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XQ     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            |             | 12.3(7)XR8; |
      | 12.3XR     | 12.3(7)XR7  | Available   |
      |            |             | on          |
      |            |             | 31-MAR-08   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XS     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XU     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3XW     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3XY     | first fixed | 12.4(18a)   |
      |            | in 12.4     |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.4(15)T4  |
      | 12.3YA     | first fixed |             |
      |            | in 12.4     | 12.4(18a)   |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YD     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; | 12.3(14)    |
      | 12.3YF     | first fixed | YX11        |
      |            | in 12.3YX   |             |
      |            |             | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.3YG     | 12.3(8)YG6  | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YH     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YI     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YJ     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.3YK     | 12.3(11)YK3 | 12.4(15)T4  |
      |------------+-------------+-------------|
      | 12.3YM     | 12.3(14)    | 12.3(14)    |
      |            | YM10        | YM12        |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YQ     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.3YS     | 12.3(11)YS2 | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YT     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.3YU     | first fixed |             |
      |            | in 12.4XB   |             |
      |------------+-------------+-------------|
      | 12.3YX     | 12.3(14)YX9 | 12.3(14)    |
      |            |             | YX11        |
      |------------+-------------+-------------|
      | 12.3YZ     | 12.3(11)YZ2 |             |
      |------------+-------------+-------------|
      |  Affected  | First Fixed | Recommended |
      | 12.4-Based |   Release   |   Release   |
      |  Releases  |             |             |
      |------------+-------------+-------------|
      |            | 12.4(10c)   |             |
      |            |             |             |
      |            | 12.4(12b)   |             |
      |            |             |             |
      |            | 12.4(13c)   |             |
      |            |             |             |
      |            | 12.4(16)    |             |
      |            |             |             |
      | 12.4       | 12.4(17a)   | 12.4(18a)   |
      |            |             |             |
      |            | 12.4(3h)    |             |
      |            |             |             |
      |            | 12.4(5c)    |             |
      |            |             |             |
      |            | 12.4(7f)    |             |
      |            |             |             |
      |            | 12.4(8d)    |             |
      |------------+-------------+-------------|
      | 12.4JA     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JK     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMA    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMB    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JMC    | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4JX     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      |            |             | 12.4(15)MD; |
      | 12.4MD     | 12.4(11)MD1 | Available   |
      |            |             | on          |
      |            |             | 09-MAY-08   |
      |------------+-------------+-------------|
      | 12.4MR     | 12.4(12)MR2 | 12.4(16)MR2 |
      |------------+-------------+-------------|
      | 12.4SW     | 12.4(11)SW3 | 12.4(15)SW  |
      |------------+-------------+-------------|
      |            | 12.4(11)T3  |             |
      |            |             |             |
      |            | 12.4(15)T   |             |
      |            |             |             |
      |            | 12.4(2)T6   |             |
      | 12.4T      |             | 12.4(15)T4  |
      |            | 12.4(4)T8   |             |
      |            |             |             |
      |            | 12.4(6)T8   |             |
      |            |             |             |
      |            | 12.4(9)T4   |             |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XA     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XB     | 12.4(2)XB6  |             |
      |------------+-------------+-------------|
      | 12.4XC     | 12.4(4)XC7  |             |
      |------------+-------------+-------------|
      | 12.4XD     | 12.4(4)XD8  | 12.4(4)XD10 |
      |------------+-------------+-------------|
      | 12.4XE     | 12.4(6)XE2  | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XF     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XG     | 12.4(9)XG2  | 12.4(9)XG2  |
      |------------+-------------+-------------|
      | 12.4XJ     | 12.4(11)XJ4 | 12.4(15)T4  |
      |------------+-------------+-------------|
      |            | Vulnerable; |             |
      | 12.4XK     | first fixed | 12.4(15)T4  |
      |            | in 12.4T    |             |
      |------------+-------------+-------------|
      | 12.4XL     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XM     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XN     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XT     | 12.4(6)XT1  | 12.4(6)XT2  |
      |------------+-------------+-------------|
      | 12.4XV     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XW     | Not         |             |
      |            | Vulnerable  |             |
      |------------+-------------+-------------|
      | 12.4XY     | Not         |             |
      |            | Vulnerable  |             |
      +----------------------------------------+
      
      Workarounds
      ===========
      
      The workaround for this vulnerability consists of filtering MDT Data
      Join packets on the PE device.
      
      The workarounds need to be applied on all Virtual Routing and
      Forwarding (VRF) interfaces of all PE routers. Otherwise, attackers
      can target remote PE routers and can still exploit this
      vulnerability.
      
      Even if only one PE router in the network runs an unfixed version of
      IOS code, it is vulnerable to packets that come from systems that are
      connected to remote PE routers. In such a case, workarounds need to
      be deployed on all PE routers to successfully mitigate this
      vulnerability.
      
      The "mdt data <group> <mask>" or "mdt data <group> <mask> threshold 
      <n> list <acl>" commands do not mitigate this vulnerability.
      
      Filtering Packets to UDP Port 3232
      +---------------------------------
      
      MDT Data Join messages are sent to UDP port 3232. Creating an
      access-list that filters destination UDP port 3232 and applying it on
      the VRF interface of the PE router mitigates this vulnerability. Such
      an access-list looks like this:
      
          access-list 100 deny udp any any eq 3232
          access-list 100 permit ip any any
          
          interface Serial 0/0
            ip vrf forwarding <vpn-1>
            ...
            ip access-group 100 in
      
      Note that this access-list can also filter legitimate traffic that is
      destined to UDP port 3232. In such a case, the access-list can be
      modified to be more specific by providing individual BGP peer IP
      addresses. This is explained in the section that follows.
      
      Filtering BGP Peer IP Addresses on the VRF Interface
      +---------------------------------------------------
      
      In order to successfully exploit this vulnerability, an attacker
      needs to send MDT Data Join messages by spoofing the packets from the
      IP address of one of the existing iBGP peers. Because MDT Data Join
      messages are only used between PE routers, the packets from CE
      devices can safely be filtered.
      
      Creating an access-list that filters iBGP peer IP addresses as source
      addresses and applying it on the VRF interface of the PE router
      mitigates this vulnerability. The access-list needs to filter all
      iBGP peer IP addresses. Such an access-list looks like this example:
      
          access-list 100 deny udp host <ibgp-peer-1> any eq 3232 
          access-list 100 deny udp host <ibgp-peer-2> any eq 3232
          ...
          access-list 100 deny udp host <ibgp-peer-n> any eq 3232 
          access-list 100 permit ip any any
          
          interface Serial 0/0
            ip vrf forwarding <vpn-1>
            ...
            ip access-group 100 in
      
      Additional mitigation techniques that can be deployed on Cisco
      devices within the network are available in the Cisco Applied
      Mitigation Bulletin companion document for this advisory:
      
      http://www.cisco.com/warp/public/707/cisco-amb-20080326-mvpn.shtml
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address this
      vulnerability. Prior to deploying software, customers should consult
      their maintenance provider or check the software for feature set
      compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature sets
      they have purchased. By installing, downloading, accessing or
      otherwise using such software upgrades, customers agree to be bound
      by the terms of Cisco's software license terms found at 
      http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html
      or as otherwise set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
      
      Do not contact psirt at cisco dot com or security-alert at cisco dot com for
      software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com.
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreements with third-party support organizations,
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of entitlement to
      a free upgrade. Free upgrades for non-contract customers must be
      requested through the TAC.
      
      Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
      for additional TAC contact information, including localized telephone
      numbers, and instructions and e-mail addresses for use in various
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerability described in this advisory.
      
      This vulnerability was reported to Cisco by Thomas Morin.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
      KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
      INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
      AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
      DOCUMENT AT ANY TIME.
      
      A stand-alone copy or Paraphrase of the text of this document that
      omits the distribution URL in the following section is an
      uncontrolled copy, and may lack important information or contain
      factual errors.
      
      Distribution
      ============
      
      This advisory is posted on Cisco's worldwide website at :
      
      http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml
      
      In addition to worldwide web posting, a text version of this notice
      is clear-signed with the Cisco PSIRT PGP key and is posted to the
      following e-mail and Usenet news recipients.
      
        * cust-security-announce at cisco dot com
        * first-teams at first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot com
      
      Future updates of this advisory, if any, will be placed on Cisco's
      worldwide website, but may or may not be actively announced on
      mailing lists or newsgroups. Users concerned about this problem are
      encouraged to check the above URL for any updates.
      
      Revision History
      ================
      
      +---------------------------------------+
      | Revision |               | Initial    |
      | 1.0      | 2008-March-26 | public     |
      |          |               | release.   |
      +---------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and
      registering to receive security information from Cisco, is available
      on Cisco's worldwide website at 
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. 
      This includes instructions for press inquiries regarding Cisco 
      security notices. All Cisco security advisories are available at 
      http://www.cisco.com/go/psirt.
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