[apops] Cisco Security Advisory: IPv6 Routing Header Vulnerability

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  • Subject: [apops] Cisco Security Advisory: IPv6 Routing Header Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 24 Jan 2007 11:45:58 -0500
  • Cc: psirt at cisco dot com
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      Cisco Security Advisory: IPv6 Routing Header Vulnerability
      
      Advisory ID: cisco-sa-20070124-IOS-IPv6
      
      http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml
      
      Revision 1.0
      
      For Public Release 2007 January 24 1600 UTC (GMT)
      
      - -----------------------------------------------------------------------
      
      Summary
      =======
      
      Processing a specially crafted IPv6 Type 0 Routing header can crash a
      device running Cisco IOS software. This vulnerability does not affect
      IPv6 Type 2 Routing header which is used in mobile IPv6. IPv6 is not
      enabled by default in Cisco IOS.
      
      Cisco has made free software available to address this vulnerability
      for affected customers.
      
      There are workarounds available to mitigate the effects of the
      vulnerability. The workaround depends on if Mobile IPv6 is used and
      what version on Cisco IOS is being currently used.
      
      This vulnerability was initially reported by a customer and further
      trigger vector was discovered during developing the fix for this
      vulnerability.
      
      This advisory is posted at 
      http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml.
      
      Affected Products
      =================
      
      Devices running Cisco IOS and having IPv6 enabled on, at least, one of
      their interface may be affected by this vulnerability.
      
      Vulnerable Products
      +------------------
      
      To determine the software running on a Cisco product, log in to the
      device and issue the "show version" command to display the system banner.
      Cisco IOS software will identify itself as "Internetwork Operating
      System Software" or simply "IOS". On the next line of output, the image
      name will be displayed between parentheses, followed by "Version" and
      the IOS release name. Other Cisco devices will not have the "show version"
      command or will give different output.
      
      The following example identifies a Cisco product running IOS release
      12.4(9.10):
      
          Cisco IOS Software, 7200 Software (C7200-JK9O3S-M), Version 12.4(9.10), INTERIM SOFTWARE
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2006 by Cisco Systems, Inc.
          Compiled Mon 29-May-06 04:42 by prod_rel_team
      
      
      Additional information about Cisco IOS release naming can be found at
      http://www.cisco.com/warp/public/620/1.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      No other Cisco products are known to be vulnerable to the issue
      described in this Advisory. In particular Cisco IOS XR, Cisco PIX
      Appliance and Cisco MDS 9000 Series devices are not affected by this
      vulnerability.
      
      Details
      =======
      
      This vulnerability can be triggered only when Cisco IOS processes
      specifically crafted IPv6 Type 0 Routing headers, which are used for
      source routing. Source routing is when an originator node explicitly
      specifies the exact path that a packet must take to reach the
      destination. Source routing is enabled by default on Cisco IOS if IPv6
      is configured on the device. In order to trigger this vulnerability the
      packet must be destined to any of the IPv6 addresses defined on the
      device. The exact packet type is not relevant (e.g., TCP, ICMP, UDP) as
      the vulnerability is on the IP layer. For this reason care must be
      taken when implementing a workaround as this vulnerability can be
      triggered by a spoofed packet.
      
      IPv6 multicast packets can not be used to trigger this vulnerability.
      
      In addition to Type 0 Routing headers, IPv6 also supports Type 2
      Routing that is used in Mobile IPv6 implementation. Type 2 Routing
      headers can not be used to trigger the vulnerability described in this
      Advisory.
      
      A router running vulnerable Cisco IOS software will process Type 0
      Routing headers only if the destination address in the IPv6 packet is
      one of the IPv6 addresses defined on any of the interfaces. The address
      may be either a global (i.e., routable), loopback or link local
      address. Link local addresses are not supposed to be routable and they
      are valid only among directly connected devices.
      
      A device may also be susceptible in scenarios where IPv6 packets are
      tunneled over IPv4 networks provided that the IPv6 destination address
      (after de-encapsulation) is one of the IPv6 addresses defined on the
      device. This is independent of the exact encapsulation method used
      (e.g., MPLS, GRE or IPv6-in-IPv4).
      
      This vulnerability is documented in Cisco Bug IDs CSCsd40334 
      and CSCsd58381. 
      
      Vulnerability Scoring Details
      +----------------------------
      
      Cisco is providing scores for the vulnerabilities in this advisory
      based on the Common Vulnerability Scoring System (CVSS).
      
      Cisco will provide a base and temporal score. Customers can then
      compute environmental scores to assist in determining the impact of the
      vulnerability in individual networks.
      
      Cisco PSIRT will set the bias in all cases to normal. Customers are
      encouraged to apply the bias parameter when determining the
      environmental impact of a particular vulnerability.
      
      CVSS is a standards based scoring method that conveys vulnerability
      severity and helps determine urgency and priority of response.
      
      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.
      
      Cisco Bug IDs:
      
      
      CSCsd40334 - IPv6 packet can cause crash
      
      CVSS Base Score: 10
          Access Vector: Remote
          Access Complexity: Low
          Authentication: Not Required
          Confidentiality Impact: Complete
          Integrity Impact: Complete
          Availability Impact: Complete
          Impact Bias: Normal
      
      CVSS Temporal Score: 8.3
          Exploitability: Functional
          Remediation Level: Official Fix
          Report Confidence: Confirmed
      
      
      
      
      CSCsd58381 - IPv6 routing header limitation
      
      CVSS Base Score: 10
          Access Vector: Remote
          Access Complexity: Low
          Authentication: Not Required
          Confidentiality Impact: Complete
          Integrity Impact: Complete
          Availability Impact: Complete
          Impact Bias: Normal
      
      CVSS Temporal Score: 8.3
          Exploitability: Functional
          Remediation Level: Official Fix
          Report Confidence: Confirmed
      
      
      
      Impact
      ======
      
      Successful exploitation of the vulnerability listed in this Advisory
      can corrupt some memory structures. In most cases this will cause the
      affected device to crash and repeated exploitation could result in a
      sustained DoS attack. However, due to memory corruption, there is a
      potential to execute an arbitrary code. In the event of a successful
      remote code execution, device integrity will have been completely
      compromised.
      
      Software Version 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) describes a release
      train and the platforms or products for which it is intended. If a
      given release train is vulnerable, then the earliest possible releases
      that contain the fix (the "First Fixed Release") and the anticipated
      date of availability for each are listed in the "Rebuild" and
      "Maintenance" columns. 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. The release should be
      upgraded at least to the indicated release or a later version (greater
      than or equal to the First Fixed Release label).
      
      For more information on the terms "Rebuild" and "Maintenance," consult
      the following URL: http://www.cisco.com/warp/public/620/1.html.
      
      Please note: There are 3 IOS security advisories and one field notice
      being published on Jan 24th, 2007. Each advisory only lists the
      releases which fix the issue described in the advisory. A combined
      software table is available at 
      http://www.cisco.com/warp/public/707/cisco-sa-20070124-bundle.shtml 
      and can be used to choose a software release which fixes all security 
      vulnerabilities published as of January 24th, 2007. The advisories and 
      field notice published on January 24 are listed here.
      
        * http://www.cisco.com/warp/public/707/cisco-air-20070124-IOS-ipv6.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
        * http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
        * http://www.cisco.com/warp/public/770/fn62613.shtml
      
      Requests for software rebuilds to include the change for Daylight
      Savings Time (DST) that will be implemented in March 2007 should be
      directed through the Technical Assistance Center (TAC) and this
      advisory should be used as reference.
      
      +-----------------------------------------------------------------------------+
      |        Major Release         |      Availability of Repaired Releases       |
      |------------------------------+----------------------------------------------|
      | Affected 12.0-Based Release  | Rebuild             | Maintenance            |
      |------------------------------+----------------------------------------------|
      | 12.0                         | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0DA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0DB                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0DC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0S                        | 12.0(32)S3          |                        |
      |------------------------------+----------------------------------------------|
      | 12.0SC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0SL                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0SP                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.0ST                       | Vulnerable; migrate to 12.0(32)S3 or later   |
      |------------------------------+----------------------------------------------|
      | 12.0SX                       | Vulnerable for only 12.0(30)SX; contact TAC  |
      |------------------------------+----------------------------------------------|
      | 12.0SY                       |                     | 12.0(32)SY             |
      |------------------------------+----------------------------------------------|
      | 12.0SZ                       | Vulnerable; migrate to 12.0(32)S3 or later   |
      |------------------------------+----------------------------------------------|
      | 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 12.1-Based Release  | Rebuild             | Maintenance            |
      |------------------------------+----------------------------------------------|
      | 12.1                         | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1AA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1AX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1AY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1AZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1CX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1DA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1DB                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1DC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1E                        | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EB                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EO                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EU                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EV                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EW                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1EZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1T                        | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XB                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XD                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XE                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XF                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XG                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XH                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XI                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XJ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XL                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XM                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XP                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XQ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XR                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XS                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XT                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XU                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.1XV                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.1XW                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1XZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YB                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.1YC                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.1YD                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.1YE                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YF                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YH                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YI                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.1YJ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | Affected 12.2-Based Release  | Rebuild             | Maintenance            |
      |------------------------------+----------------------------------------------|
      | 12.2                         | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2B                        | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2BC                       | Vulnerable; migrate to 12.3(17b)BC3 or later |
      |------------------------------+----------------------------------------------|
      | 12.2BW                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2BY                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2BZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2CX                       | Vulnerable; migrate to 12.3(17b)BC3 or later |
      |------------------------------+----------------------------------------------|
      | 12.2CY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2CZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2DA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2DD                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2DX                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2EU                       | Vulnerable; migrate to 12.2(25)EWA6 or later |
      |------------------------------+----------------------------------------------|
      | 12.2EW                       | Vulnerable; migrate to 12.2(25)EWA6 or later |
      |------------------------------+----------------------------------------------|
      | 12.2EWA                      | 12.2(25)EWA6        |                        |
      |------------------------------+----------------------------------------------|
      | 12.2EX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2EY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2EZ                       | Vulnerable; migrate to 12.2(25)SEE1 or later |
      |------------------------------+----------------------------------------------|
      | 12.2FX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2FY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2FZ                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2IXA                      | Vulnerable; migrate to 12.2(18)IXB or later  |
      |------------------------------+----------------------------------------------|
      | 12.2IXB                      | All 12.2IXB releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2IXC                      | All 12.2IXC releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2JA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2JK                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2MB                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2MC                       | 12.2(15)MC2h        |                        |
      |------------------------------+---------------------+------------------------|
      | 12.2S                        | 12.2(25)S11         | 12.2(30)S              |
      |------------------------------+---------------------+------------------------|
      | 12.2SB                       | 12.2(28)SB2         | 12.2(31)SB             |
      |------------------------------+---------------------+------------------------|
      | 12.2SBC                      | 12.2(27)SBC4        |                        |
      |------------------------------+----------------------------------------------|
      | 12.2SEA                      | Vulnerable; migrate to 12.2(25)SEE1 or later |
      |------------------------------+----------------------------------------------|
      | 12.2SEB                      | Vulnerable; migrate to 12.2(25)SEE1 or later |
      |------------------------------+----------------------------------------------|
      | 12.2SEC                      | Vulnerable; migrate to 12.2(25)SEE1 or later |
      |------------------------------+----------------------------------------------|
      | 12.2SED                      | Vulnerable; migrate to 12.2(25)SEE1 or later |
      |------------------------------+----------------------------------------------|
      | 12.2SEE                      | 12.2(25)SEE1        |                        |
      |------------------------------+---------------------+------------------------|
      | 12.2SEF                      | 12.2(25)SEF1        |                        |
      |------------------------------+----------------------------------------------|
      | 12.2SEG                      | All 12.2SEG releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2SG                       | 12.2(25)SG1         | 12.2(31)SG             |
      |------------------------------+----------------------------------------------|
      | 12.2SGA                      | All 12.2SGA releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2SO                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2SRA                      | All 12.2SRA releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2SRB                      | All 12.2SRB releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.2SU                       | Vulnerable; migrate to 12.3(14)T7 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2SV                       | 12.2(25)SV3         | 12.2(26)SV             |
      |------------------------------+---------------------+------------------------|
      | 12.2SW                       | 12.2(25)SW7         |                        |
      |------------------------------+----------------------------------------------|
      | 12.2SX                       | Vulnerable; migrate to 12.2(18)SXD7a or      |
      |                              | later                                        |
      |------------------------------+----------------------------------------------|
      | 12.2SXA                      | Vulnerable; migrate to 12.2(18)SXD7a or      |
      |                              | later                                        |
      |------------------------------+----------------------------------------------|
      | 12.2SXB                      | Vulnerable; migrate to 12.2(18)SXD7a or      |
      |                              | later                                        |
      |------------------------------+----------------------------------------------|
      | 12.2SXD                      | 12.2(18)SXD7a       |                        |
      |------------------------------+---------------------+------------------------|
      | 12.2SXE                      | 12.2(18)SXE6        |                        |
      |------------------------------+---------------------+------------------------|
      | 12.2SXF                      | 12.2(18)SXF5        |                        |
      |------------------------------+----------------------------------------------|
      | 12.2SY                       | Vulnerable; migrate to 12.2(18)SXD7a or      |
      |                              | later                                        |
      |------------------------------+----------------------------------------------|
      | 12.2SZ                       | Vulnerable; migrate to 12.2(25)S11 or later  |
      |------------------------------+----------------------------------------------|
      | 12.2T                        | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2TPC                      | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.2XA                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XB                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XC                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2XD                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XE                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2XF                       | Vulnerable; migrate to 12.3(17b)BC3 or later |
      |------------------------------+----------------------------------------------|
      | 12.2XG                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XH                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XI                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XJ                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XK                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XL                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XM                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XN                       |                     | 12.2(31)XN             |
      |------------------------------+----------------------------------------------|
      | 12.2XQ                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XR                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2XS                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XT                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XU                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XV                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2XW                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YA                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YB                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2YD                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.2YE                       | Vulnerable; migrate to 12.2(25)S11 or later  |
      |------------------------------+----------------------------------------------|
      | 12.2YF                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YG                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2YH                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YJ                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YK                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2YL                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YM                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YN                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YO                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2YP                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2YQ                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YR                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YT                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2YU                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YV                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YW                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YX                       | Vulnerable; migrate to 12.3(14)T7 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YY                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2YZ                       | Vulnerable; migrate to 12.2(25)S11 or later  |
      |------------------------------+----------------------------------------------|
      | 12.2ZA                       | Vulnerable; migrate to 12.2(18)SXD7a or      |
      |                              | later                                        |
      |------------------------------+----------------------------------------------|
      | 12.2ZB                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2ZC                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2ZD                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.2ZE                       | Vulnerable; migrate to 12.3(18) or later     |
      |------------------------------+----------------------------------------------|
      | 12.2ZF                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2ZG                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.2ZH                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.2ZJ                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2ZL                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.2ZN                       | Vulnerable; migrate to 12.3(4)T13 or later   |
      |------------------------------+----------------------------------------------|
      | 12.2ZP                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | Affected 12.3-Based Release  | Rebuild             | Maintenance            |
      |------------------------------+---------------------+------------------------|
      | 12.3                         | 12.3(17b)           | 12.3(18)               |
      |------------------------------+----------------------------------------------|
      | 12.3B                        | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3BC                       | 12.3(17b)BC3        |                        |
      |------------------------------+----------------------------------------------|
      | 12.3BW                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3JA                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.3JEA                      | All 12.3JEA releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.3JEB                      | All 12.3JEA releases are fixed               |
      |------------------------------+----------------------------------------------|
      | 12.3JK                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.3JX                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      |                              | 12.3(4)T13          |                        |
      |                              |---------------------+------------------------|
      | 12.3T                        | 12.3(11)T10         |                        |
      |                              |---------------------+------------------------|
      |                              | 12.3(14)T7          |                        |
      |------------------------------+----------------------------------------------|
      | 12.3TPC                      | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.3XA                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3XB                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XC                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3XD                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XE                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3XF                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XG                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3XH                       | Vulnerable; migrate to 12.3(11)T10 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XI                       | 12.3(7)XI8a         | 12.3(7)XI9             |
      |------------------------------+----------------------------------------------|
      | 12.3XJ                       | Vulnerable; migrate to 12.3(14)YX2 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XK                       | Vulnerable; migrate to 12.3(14)T7 or later   |
      |------------------------------+----------------------------------------------|
      | 12.3XQ                       | Vulnerable; migrate to 12.4(8) or later      |
      |------------------------------+----------------------------------------------|
      | 12.3XR                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3XS                       | Vulnerable; migrate to 12.4(8) or later      |
      |------------------------------+----------------------------------------------|
      | 12.3XU                       | Vulnerable; migrate to 12.4(2)T4 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3XW                       | Vulnerable; migrate to 12.3(14)YX2 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3XX                       | Vulnerable; migrate to 12.4(8) or later      |
      |------------------------------+----------------------------------------------|
      | 12.3XY                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.3YA                       | Vulnerable; contact TAC                      |
      |------------------------------+----------------------------------------------|
      | 12.3YD                       | Vulnerable; migrate to 12.4(2)T4 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YF                       | Vulnerable; migrate to 12.3(14)YX2 or later  |
      |------------------------------+----------------------------------------------|
      | 12.3YG                       | Vulnerable; migrate to 12.4(2)T4 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YH                       | Vulnerable; migrate to 12.4(2)T4 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YI                       | Vulnerable; migrate to 12.4(2)T4 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YJ                       | Vulnerable; migrate to 12.4(6)T1 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YK                       | Vulnerable; migrate to 12.4(4)T2 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YM                       | 12.3(14)YM8         |                        |
      |------------------------------+----------------------------------------------|
      | 12.3YQ                       | Vulnerable; migrate to 12.4(6)T1 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YS                       | Vulnerable; migrate to 12.4(4)T2 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YT                       | Vulnerable; migrate to 12.4(4)T2 or later    |
      |------------------------------+----------------------------------------------|
      | 12.3YU                       | Vulnerable; migrate to 12.4(2)XB2 or later   |
      |------------------------------+----------------------------------------------|
      | 12.3YX                       | 12.3(14)YX2         |                        |
      |------------------------------+---------------------+------------------------|
      | 12.3YZ                       | 12.3(11)YZ1         |                        |
      |------------------------------+---------------------+------------------------|
      | Affected 12.4-Based Release  | Rebuild             | Maintenance            |
      |------------------------------+---------------------+------------------------|
      |                              | 12.4(3d)            |                        |
      |                              |---------------------+------------------------|
      | 12.4                         | 12.4(5b)            |                        |
      |                              |---------------------+------------------------|
      |                              | 12.4(7a)            | 12.4(8)                |
      |------------------------------+----------------------------------------------|
      | 12.4MR                       | Not vulnerable                               |
      |------------------------------+----------------------------------------------|
      | 12.4SW                       | All 12.4SW releases are fixed                |
      |------------------------------+----------------------------------------------|
      |                              | 12.4(2)T4           |                        |
      |                              |---------------------+------------------------|
      | 12.4T                        | 12.4(4)T2           |                        |
      |                              |---------------------+------------------------|
      |                              | 12.4(6)T1           | 12.4(9)T               |
      |------------------------------+----------------------------------------------|
      | 12.4XA                       | Vulnerable; migrate to 12.4(6)T1 or later    |
      |------------------------------+----------------------------------------------|
      | 12.4XB                       | 12.4(2)XB2          |                        |
      |------------------------------+---------------------+------------------------|
      | 12.4XC                       | 12.4(4)XC5          |                        |
      |------------------------------+---------------------+------------------------|
      | 12.4XD                       | 12.4(4)XD2          |                        |
      |------------------------------+----------------------------------------------|
      | 12.4XE                       | All 12.4XE releases are fixed                |
      |------------------------------+----------------------------------------------|
      | 12.4XG                       | All 12.4XG releases are fixed                |
      |------------------------------+----------------------------------------------|
      | 12.4XJ                       | All 12.4XJ releases are fixed                |
      |------------------------------+----------------------------------------------|
      | 12.4XP                       | All 12.4XP releases are fixed                |
      |------------------------------+----------------------------------------------|
      | 12.4XT                       | All 12.4XT releases are fixed                |
      +-----------------------------------------------------------------------------+
      
      Workarounds
      ===========
      
      The workaround consists of filtering packets that contain Type 0
      Routing header(s). Special attention must be paid not to filter packets
      with Type 2 Routing headers as that would break Mobile IPv6 deployment.
      Depending on what Cisco IOS software release is used and if Mobile IPv6
      is deployed or not we have the following workarounds. As any packet
      type can be used to trigger this vulnerability the care must be taken
      when implementing a workaround to account for a spoofed packet.
      
      Additional mitigations that can be deployed on Cisco devices within the
      network are available in the Cisco Applied Intelligence companion
      document for this advisory: 
      http://www.cisco.com/warp/public/707/cisco-air-20070124-IOS-IPv6.shtml
      
      Mobile IPv6 is not deployed
      +--------------------------
      
      For IOS releases before 12.3(4)T the workaround is to use ACLs to
      filter all packets that contain Routing headers. This method can not
      distinguish between Type 0 and Type 2 Routing headers so it is not
      suitable if Mobile IPv6 is deployed.
      
      The following example shows how to configure such ACLs.
      
          Router(config)#ipv6 access-list deny-sourcerouted
          Router(config-ipv6-acl)#deny ipv6 any <myaddress1> routing
          Router(config-ipv6-acl)#deny ipv6 any <myaddress2> routing
          Router(config-ipv6-acl)#permit ipv6 any any
          Router(config-ipv6-acl)#exit
          Router(config)#interface Ethernet0
          Router(config-if)#ipv6 traffic-filter deny-sourcerouted in
      
      
      In this example <myaddressX> is an IPv6 address. One example of such
      address is 2600:dead:beef:cafe:0:1:0:1111. The ACL must be applied to
      all interfaces and all IPv6 addresses that are configured. If an
      interface has more than one IPv6 address configured then all addresses
      must be covered by the ACLs. This also includes all loopback and "link
      local" addresses for each interface.
      
      The alternative of enumerating all IPv6 addresses is to use statement
      "deny ipv6 any any routing". While that simplifies the resulting ACL it
      will also filter all transit IPv6 traffic with Routing headers 0 and 2.
      The example where all configured IPv6 addresses are enumerated will not
      affect transit traffic. This comment is applicable to all other
      examples in this Advisory.
      
      Starting from the IOS release 12.2(15)T a new command "ipv6 source-route"
      was introduced. If applied, it will block any IPv6 packet with any IPv6
      routing headers (both types 0 and 2). The configuration is given in the
      following example.
      
          Router(config)#no ipv6 source-route
      
      
      This is a global command and it applies to all interfaces. The command
      is applicable on all defined IPv6 addresses, including the link local
      and loopback address, and on all interfaces.
      
      Mobile IPv6 is deployed
      +----------------------
      
      There is no workaround if you are running a Cisco IOS release prior to
      12.4(2)T. In IOS 12.4(2)T a new keyword "routing-type" is added to IPv6
      ACLs. It can be used to selectively permit or deny specific routing
      types.
      
          Router(config)#ipv6 access-list deny-sourcerouted
          Router(config-ipv6-acl)#deny ipv6 any <myaddress1> routing-type 0
          Router(config-ipv6-acl)#permit ipv6 any any
          Router(config)#interface Ethernet0
          Router(config-if)#ipv6 source-route
          Router(config-if)#ipv6 traffic-filter deny-sourcerouted in
      
      
      The filter must be applied to all interfaces that have IPv6 configured.
      
      Obtaining Fixed Software
      ========================
      
      Cisco will make free software available to address this vulnerability
      for affected customers. This advisory will be updated as fixed software
      becomes available. 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/public/sw-license-agreement.html, or as otherwise 
      set forth at Cisco.com Downloads at 
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
      
      Do not contact either "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 agreement 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 who do not hold a Cisco
      service contract and customers who purchase through third-party vendors
      but are unsuccessful at obtaining fixed software through their point of
      sale should get their 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
      
      Have your product serial number available and give the URL of this
      notice as evidence of your 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 special 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 initially reported to Cisco by Arnaud Ebalard
      from EADS Corporate Research Center. An additional vector to trigger it
      was discovered internally while fixing the vulnerability.
      
      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-20070124-IOS-IPv6.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 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
      ================
      
      +----------------------------------------+
      | 1.0 | 2007-January-24 | Initial public |
      |     |                 | release.       |
      +----------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities in Cisco
      products, obtaining assistance with security incidents, and registering
      to receive security information from Cisco, is available on Cisco's
      worldwide website at 
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
      This includes instructions for press inquiries regarding Cisco security 
      notices. All Cisco security advisories are available at 
      http://www.cisco.com/go/psirt.
      
      - -----------------------------------------------------------------------
      All contents are Copyright 1992-2007 Cisco Systems, Inc. All rights
      reserved. 
      - -----------------------------------------------------------------------
      
      Updated: Jan 24, 2007                                Document ID: 72372
      
      - -----------------------------------------------------------------------
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