[apops] Cisco Security Advisory: Cisco IOS Software Mobile IP and Mobile

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software Mobile IP and Mobile IPv6 Vulnerabilities
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 25 Mar 2009 17:00:00 +0100
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      Cisco Security Advisory: Cisco IOS Software Mobile IP and Mobile IPv6
      Vulnerabilities
      
      Advisory ID: cisco-sa-20090325-mobileip
      
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml
      
      Revision 1.0
      
      For Public Release 2009 March 25 1600 UTC (GMT)
      
      - ---------------------------------------------------------------------
      
      Summary
      =======
      
      Devices that are running Cisco IOS Software and configured for Mobile
      IP Network Address Translation (NAT) Traversal feature or Mobile IPv6
      are vulnerable to a denial of service (DoS) attack that may result in
      a blocked interface.
      
      Cisco has released free software updates that address these
      vulnerabilities.
      
      This advisory is posted at the following link 
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml
      
      Note: The March 25, 2009, Cisco IOS Security Advisory bundled
      publication includes eight Security Advisories. All of the advisories
      address vulnerabilities in Cisco IOS Software. Each advisory lists
      the releases that correct the vulnerability or vulnerabilities in the
      advisory. The following table lists releases that correct all Cisco
      IOS Software vulnerabilities that have been published in Cisco
      Security Advisories on March 25, 2009, or earlier.
      
      http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml
      
      Individual publication links are listed below:
      
        * Cisco IOS cTCP Denial of Service Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml
      
        * Cisco IOS Software Multiple Features IP Sockets Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml
      
        * Cisco IOS Software Mobile IP and Mobile IPv6 Vulnerabilities
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml
      
        * Cisco IOS Software Secure Copy Privilege Escalation Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml
      
        * Cisco IOS Software Session Initiation Protocol Denial of Service
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml
      
        * Cisco IOS Software Multiple Features Crafted TCP Sequence
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml
      
        * Cisco IOS Software Multiple Features Crafted UDP Packet
          Vulnerability
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml
      
        * Cisco IOS Software WebVPN and SSLVPN Vulnerabilities
          http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
      
      Affected Products
      =================
      
      Devices that are running an affected version of Cisco IOS Software
      and configured for Mobile IP NAT Traversal feature or Mobile IPv6 are
      vulnerable.
      
      Vulnerable Products
      +------------------
      
      Devices running Cisco IOS Software and configured for Mobile IP NAT
      Traversal feature will have a line similar to the following in the
      output of the show running-config command:
      
          ip mobile home-agent nat traversal [...]
      
      or
      
          ip mobile foreign-agent nat traversal [...]
      
      or
      
          ip mobile router-service collocated registration nat traversal [...]
      
      Devices running Cisco IOS Software and configured for Mobile IPv6
      will have a line similar to the following in the output of the show
      running-config command:
      
          ipv6 mobile home-agent
      
      To determine the Cisco IOS Software release that is running on a
      Cisco product, administrators can log in to the device and issue the
      show version command to display the system banner. The system banner
      confirms that the device is running Cisco IOS Software by displaying
      text similar to "Cisco Internetwork Operating System Software" or
      "Cisco IOS Software." The image name displays in parentheses,
      followed by "Version" and the Cisco IOS Software release name. Other
      Cisco devices do not have the show version command or may provide
      different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 12.3(26) with an installed image name of
      C2500-IS-L:
      
              Router#show version
              Cisco Internetwork Operating System Software
              IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
              Technical Support: http://www.cisco.com/techsupport
              Copyright (c) 1986-2008 by cisco Systems, Inc.
              Compiled Mon 17-Mar-08 14:39 by dchih
              !--- output truncated
      
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 12.4(20)T with an installed image name of
      C1841-ADVENTERPRISEK9-M:
      
              Router#show version
              Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
              Technical Support: http://www.cisco.com/techsupport
              Copyright (c) 1986-2008 by Cisco Systems, Inc.
              Compiled Thu 10-Jul-08 20:25 by prod_rel_team
              !--- output truncated
      
      
      Additional information about Cisco IOS Software release naming
      conventions is available in "White Paper: Cisco IOS Reference Guide"
      at the following link: http://www.cisco.com/warp/public/620/1.html
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS XR is not affected by these vulnerabilities.
      
      Cisco IOS XE is not affected by these vulnerabilities.
      
      No other Cisco products are currently known to be affected by these
      vulnerabilities.
      
      Details
      =======
      
      Mobile IP is part of both IPv4 and IPv6 standards. Mobile IP allows a
      host device to be identified by a single IP address even though the
      device may move its physical point of attachment from one network to
      another. Regardless of movement between different networks,
      connectivity at the different points is achieved seamlessly without
      user intervention. Roaming from a wired network to a wireless or
      wide-area network is also possible.
      
      More information on Mobile IPv6 can be found at the following link:
      http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html
      
      The Mobile IP Support NAT Traversal feature is documented in RFC
      3519. It introduces an alternative method for tunneling Mobile IP
      data traffic. New extensions in the Mobile IP registration request
      and reply messages have been added for establishing User Datagram
      Protocol (UDP) tunneling. This feature allows mobile devices in
      collocated mode that use a private IP address (RFC 1918) or foreign
      agents (FAs) that use a private IP address for the care-of address
      (CoA) to establish a tunnel and traverse a NAT-enabled router with
      mobile node (MN) data traffic from the home agent (HA).
      
      More information on Mobile IP NAT Traversal feature can be found at
      the following link: 
      http://www.cisco.com/en/US/docs/ios/12_3t/12_3t8/feature/guide/gtnatmip.html
      
      Devices that are running an affected version of Cisco IOS Software
      and configured for Mobile IPv6 or Mobile IP NAT Traversal feature are
      affected by a DoS vulnerability. A successful exploitation of this
      vulnerability could cause an interface to stop processing traffic
      until the system is restarted. Offending packets need to be destined
      to the router for a successful exploit.
      
      These vulnerabilities are documented in the Cisco Bug IDs CSCsm97220 
      and CSCso05337 and have been assigned Common Vulnerabilities and 
      Exposures (CVE) IDs CVE-2009-0633 and CVE-2009-0634.
      
      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
      
      CSCsm97220 - Input queue wedged by MIPv6 packets
      
      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
      
      CSCso05337 - HA: Input queue wedged by ICMP packet
      
      CVSS Base Score - 7.1
      
       Access Vector           - Network
       Access Complexity       - Medium
       Authentication          - None
       Confidentiality Impact  - None
       Integrity Impact        - None
       Availability Impact     - Complete
      
      CVSS Temporal Score - 5.9
      
       Exploitability	         - Functional
       Remediation Level       - Official-Fix
       Report Confidence       - Confirmed
      
      Impact
      ======
      
      Successful exploitation of the vulnerability may result in an
      interface to stop processing traffic, causing 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   |                                      |               |
      |-------------------------------------------------------------------|
      | There are no affected 12.2 based releases                         |
      |-------------------------------------------------------------------|
      | Affected   |                                      | Recommended   |
      | 12.3-Based | First Fixed Release                  | Release       |
      | Releases   |                                      |               |
      |------------+--------------------------------------+---------------|
      | 12.3       | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3B      | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3BC     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3BW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3EU     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JEA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JEB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JEC    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3JX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3T      | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.3TPC    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3VA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XB     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XC     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XD     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XE     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XF     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XI     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XJ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XQ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XR     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XS     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XU     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XY     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3XZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YD     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YF     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YH     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YI     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3YJ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            | Releases prior to 12.3(11)YK3 are    | 12.4(22)T1    |
      |            | vulnerable, release 12.3(11)YK3 and  |               |
      | 12.3YK     | later are not vulnerable; first      | 12.4(15)T9;   |
      |            | fixed in 12.4T                       | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.3YM     | 12.3(14)YM13                         | 12.3(14)YM13  |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YQ     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YS     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YT     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.3YU     | Vulnerable; migrate to 12.4T         | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            | Releases prior to 12.3(14)YX10 are   |               |
      | 12.3YX     | vulnerable, release 12.3(14)YX10 and | 12.3(14)YX14  |
      |            | later are not vulnerable;            |               |
      |------------+--------------------------------------+---------------|
      | 12.3YZ     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.3ZA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | Affected   |                                      | Recommended   |
      | 12.4-Based | First Fixed Release                  | Release       |
      | Releases   |                                      |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(18e)     |
      |            | 12.4(18e)                            |               |
      | 12.4       |                                      | 12.4(23a);    |
      |            | 12.4(23a); Available on 30-APR-2009  | Available on  |
      |            |                                      | 30-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4JA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JDA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JL     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JMA    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JMB    | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4JX     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4MD     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4MR     | 12.4(19)MR                           | 12.4(19)MR2   |
      |------------+--------------------------------------+---------------|
      | 12.4SW     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            | 12.4(20)T                            | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4T      | 12.4(15)T8                           | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XA     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            | 12.4(15)T8                           | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XB     | 12.4(20)T                            | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XC     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            | 12.4(4)XD12; Available on            | 12.4(4)XD12;  |
      | 12.4XD     | 27-MAR-2009                          | Available on  |
      |            |                                      | 27-MAR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XE     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XF     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XG     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XJ     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XK     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4XL     | 12.4(15)XL4                          | 12.4(15)XL4   |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XM     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XN     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.4XP     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.4XQ     | 12.4(15)XQ2                          | 12.4(15)XQ2   |
      |------------+--------------------------------------+---------------|
      | 12.4XR     | 12.4(15)XR4                          | 12.4(22)T1    |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XT     | Vulnerable; first fixed in 12.4T     | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XV     | Vulnerable; contact TAC              |               |
      |------------+--------------------------------------+---------------|
      | 12.4XW     | 12.4(11)XW10                         | 12.4(11)XW10  |
      |------------+--------------------------------------+---------------|
      |            |                                      | 12.4(22)T1    |
      |            |                                      |               |
      | 12.4XY     | 12.4(15)XY4                          | 12.4(15)T9;   |
      |            |                                      | Available on  |
      |            |                                      | 29-APR-2009   |
      |------------+--------------------------------------+---------------|
      | 12.4XZ     | 12.4(15)XZ1                          | 12.4(15)XZ2   |
      |------------+--------------------------------------+---------------|
      | 12.4YA     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4YB     | Not Vulnerable                       |               |
      |------------+--------------------------------------+---------------|
      | 12.4YD     | Not Vulnerable                       |               |
      +-------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      The following mitigation and identification methods have been
      identified for these vulnerabilities:
      
      Infrastructure Access Control Lists
      +----------------------------------
      
      Although it is often difficult to block traffic that transits a
      network, it is possible to identify traffic that should never be
      allowed to target infrastructure devices and block that traffic at
      the border of networks. Infrastructure Access Control Lists (iACLs)
      are a network security best practice and should be considered as a
      long-term addition to good network security as well as a workaround
      for these specific vulnerabilities. The iACL example below should be
      included as part of the deployed infrastructure access-list which
      will protect all devices with IP addresses in the infrastructure IP
      address range:
      
      IPv4 example:
      
      
          !--- Anti-spoofing entries are shown here.
      
          !--- Deny special-use address sources.
          !--- Refer to RFC 3330 for additional special use addresses.
      
          access-list 110 deny ip host 0.0.0.0 any
          access-list 110 deny ip 127.0.0.0 0.255.255.255 any
          access-list 110 deny ip 192.0.2.0 0.0.0.255 any
          access-list 110 deny ip 224.0.0.0 31.255.255.255 any
      
          !--- Filter RFC 1918 space.
      
          access-list 110 deny ip 10.0.0.0 0.255.255.255 any
          access-list 110 deny ip 172.16.0.0 0.15.255.255 any
          access-list 110 deny ip 192.168.0.0 0.0.255.255 any
      
          !--- Deny your space as source from entering your AS.
          !--- Deploy only at the AS edge.
      
          access-list 110 deny ip YOUR_CIDR_BLOCK any
      
          !--- Permit BGP.
      
          access-list 110 permit tcp host bgp_peer host router_ip eq bgp
          access-list 110 permit tcp host bgp_peer eq bgp host router_ip
      
          !--- Deny access to internal infrastructure addresses.
      
          access-list 110 deny ip any INTERNAL_INFRASTRUCTURE_ADDRESSES
      
          !--- Permit transit traffic.
      
          access-list 110 permit ip any any
      
      IPv6 example:
      
      
          !--- Configure the access-list.
      
          ipv6 access-list iacl
      
          !--- Deny your space as source from entering your AS.
          !--- Deploy only at the AS edge.
      
          deny ipv6 YOUR_CIDR_BLOCK_IPV6 any
      
          !--- Permit multiprotocol BGP.
      
          permit tcp host bgp_peer_ipv6 host router_ipv6 eq bgp
          permit tcp host bgp_peer_ipv6 eq bgp host router_ipv6
      
          !--- Deny access to internal infrastructure addresses.
      
          deny ipv6 any INTERNAL_INFRASTRUCTURE_ADDRESSES_IPV6
      
          !--- Permit transit traffic.
      
          permit ipv6 any any
      
      The white paper entitled "Protecting Your Core: Infrastructure
      Protection Access Control Lists" presents guidelines and recommended
      deployment techniques for infrastructure protection access lists.
      This white paper can be obtained at the following link 
      http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
      
      Cisco IOS Embedded Event Manager
      +-------------------------------
      
      It is possible to detect blocked interface queues with a Cisco IOS
      Embedded Event Manager (EEM) policy. EEM provides event detection and
      reaction capabilities on a Cisco IOS device. EEM can alert
      administrators of blocked interfaces with email, a syslog message, or
      a Simple Network Management Protocol (SNMP) trap.
      
      A sample EEM policy that uses syslog to alert administrators of
      blocked interfaces is available at Cisco Beyond, an online community
      dedicated to EEM. A sample script is available at the following link:
      
      http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=981
      
      More information about EEM is available from Cisco.com at the
      following link: 
      http://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address these
      vulnerabilities. Prior to deploying software, customers should
      consult their maintenance provider or check the software for feature
      set compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature sets
      they have purchased. By installing, downloading, accessing or
      otherwise using such software upgrades, customers agree to be bound
      by the terms of Cisco's software license terms found at 
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
      or as otherwise set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml
      
      Do not contact psirt at cisco dot com or security-alert at cisco dot com for
      software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreements with third-party support organizations,
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of entitlement to
      a free upgrade. Free upgrades for non-contract customers must be
      requested through the TAC.
      
      Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
      for additional TAC contact information, including localized telephone
      numbers, and instructions and e-mail addresses for use in various 
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerability described in this advisory.
      
      This vulnerability was reported to Cisco by a customer.
      
      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-20090325-mobileip.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      | 2009-Mar-25 | 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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