|
|
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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