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Cisco Security Advisory: Cisco 10000, uBR10012, uBR7200 Series
Devices IPC Vulnerability

Advisory ID: cisco-sa-20080924-ipc

http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml

Revision 1.0

For Public Release 2008 September 24 1600 UTC (GMT)

- ---------------------------------------------------------------------

Summary
=======

Cisco 10000, uBR10012 and uBR7200 series devices use a User Datagram
Protocol (UDP) based Inter-Process Communication (IPC) channel that
is externally reachable. An attacker could exploit this vulnerability
to cause a denial of service (DoS) condition on affected devices. No
other platforms are affected.

Cisco has released free software updates that address this
vulnerability. Workarounds that mitigate this vulnerability are
available.

This advisory is posted at 
http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml

Note: The September 24, 2008 IOS Advisory bundled publication
includes twelve Security Advisories. Eleven of the advisories address
vulnerabilities in Cisco's IOS^  software, and one advisory addresses
vulnerabilities in Cisco Unified Communications Manager. Each
Advisory lists the releases that correct the vulnerability described
in the Advisory. Please reference the following software table to
find a release that fixes all published IOS software Advisories as of
September 24th, 2008:

http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml

Individual publication links are listed below:

  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml
  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml

Affected Products
=================

Cisco 10000, uBR10012 and uBR7200 series devices that are running an
affected version of Cisco IOS are affected.

Vulnerable Products
+------------------

Devices that are running Cisco IOS can be identified by using the
show version command. The following example shows an output taken
from a Cisco 10000 series device running Cisco IOS software release
12.2(31)SB10e:

    c10k#show version | include IOS
    Cisco IOS Software, 10000 Software (C10K3-P11-M), Version 12.2(31)SB10e, RELEASE SOFTWARE (fc1)
    c10k#

The following example shows an output taken from a Cisco uBR10012
series device running Cisco IOS software release 12.3(17b)BC7:

    ubr10k#show version | include IOS
    IOS (tm) 10000 Software (UBR10K-K8P6U2-M), Version 12.3(17b)BC7, RELEASE SOFTWARE (fc1)
    ubr10k#

The following example shows an output taken from a Cisco uBR7200
series device running Cisco IOS software release 12.3(21a)BC2:

    ubr7200#show version | include IOS
    IOS (tm) 7200 Software (UBR7200-IK9SU2-M), Version 12.3(21a)BC2, RELEASE SOFTWARE (fc1)
    ubr7200#

Please refer to the document entitled "White Paper: Cisco IOS
Reference Guide" for additional information on the Cisco IOS release
naming conventions. This document is available at the following link:
http://www.cisco.com/warp/public/620/1.html

Any version of Cisco IOS prior to the fixed versions listed in the
Software Versions and Fixes section below is vulnerable.

Products Confirmed Not Vulnerable
+--------------------------------

Cisco uBR7100 series devices are not affected.

No other Cisco products are currently known to be affected by this
vulnerability.

Details
=======

Cisco 10000, uBR10012 and uBR7200 series devices use a UDP-based IPC
channel. This channel uses addresses from the 127.0.0.0/8 range and
UDP port 1975. Cisco 10000, uBR10012 and uBR7200 series devices that
are running an affected version of Cisco IOS will process IPC
messages that are sent to UDP port 1975 from outside of the device.
This behavior may be exploited by an attacker to cause a reload of
the device, linecards, or both, resulting in a DoS condition.

Filtering unauthorized traffic destined to 127.0.0.0/8 or UDP port
1975 will mitigate this vulnerability.

This vulnerability is documented in the Cisco Bug IDs CSCsg15342 
and CSCsh29217 and has been assigned Common Vulnerabilities and 
Exposures (CVE) ID CVE-2008-3805.

Vulnerability Scoring Details
=============================

Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding
CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss

CSCsg15342 - IPC processing needs to be more robust

CVSS Base Score - 8.5

        Access Vector          - Network
        Access Complexity      - Low
        Authentication         - None
        Confidentiality Impact - None
        Integrity Impact       - Partial
        Availability Impact    - Complete

CVSS Temporal Score - 7

        Exploitability          - Functional
        Remediation Level       - Official-Fix
        Report Confidence       - Confirmed


CSCsh29217 - IPC processing needs to be more robust

CVSS Base Score - 8.5

        Access Vector          - Network
        Access Complexity      - Low
        Authentication         - None
        Confidentiality Impact - None
        Integrity Impact       - Partial
        Availability Impact    - Complete

CVSS Temporal Score - 7

        Exploitability          - Functional
        Remediation Level       - Official-Fix
        Report Confidence       - Confirmed

Impact
======

Successful exploitation of the vulnerability may result in a reload
of the device, linecards, or both, resulting in a DoS condition.

Software Versions and Fixes
===========================

When considering software upgrades, also consult 
http://www.cisco.com/go/psirt and any subsequent advisories to 
determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center (TAC) or your contracted
maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS
release train. If a given release train is vulnerable, then the
earliest possible releases that contain the fix (along with the
anticipated date of availability for each, if applicable) are listed
in the "First Fixed Release" column of the table. The "Recommended
Release" column indicates the releases which have fixes for all the
published vulnerabilities at the time of this Advisory. A device
running a release in the given train that is earlier than the release
in a specific column (less than the First Fixed Release) is known to
be vulnerable. Cisco recommends upgrading to a release equal to or
later than the release in the "Recommended Releases" column of the
table.

+-------------------------------------------------------------------+
|    Major    |          Availability of Repaired Releases          |
|   Release   |                                                     |
|-------------+-----------------------------------------------------|
|  Affected   |                                     |  Recommended  |
| 12.0-Based  |         First Fixed Release         |    Release    |
|  Releases   |                                     |               |
|-------------+-------------------------------------+---------------|
| 12.0        | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0DA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0DB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0DC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             | Releases prior to 12.0(32)S are     | 12.0(32)S11   |
| 12.0S       | vulnerable, release 12.0(32)S and   |               |
|             | later are not vulnerable;           | 12.0(33)S1    |
|-------------+-------------------------------------+---------------|
| 12.0SC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0SL      | Vulnerable, migrate to 12.0S, 12.1  |               |
|-------------+-------------------------------------+---------------|
| 12.0SP      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0ST      | Vulnerable, migrate to 12.0S, 12.1  |               |
|-------------+-------------------------------------+---------------|
| 12.0SX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0SY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             |                                     | 12.0(32)S11   |
| 12.0SZ      | 12.0(30)SZ4                         |               |
|             |                                     | 12.0(33)S1    |
|-------------+-------------------------------------+---------------|
| 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                      |               |
|-------------+-------------------------------------+---------------|
| 12.0XT      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.0XV      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|  Affected   |                                     |  Recommended  |
| 12.1-Based  |         First Fixed Release         |    Release    |
|  Releases   |                                     |               |
|-------------------------------------------------------------------|
| There are no affected 12.1 based releases                         |
|-------------------------------------------------------------------|
|  Affected   |                                     |  Recommended  |
| 12.2-Based  |         First Fixed Release         |    Release    |
|  Releases   |                                     |               |
|-------------+-------------------------------------+---------------|
| 12.2        | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2B       | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2BC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2BW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2BX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2BY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2BZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2CX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2CY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2CZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2DA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2DD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2DX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2EW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2EWA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2EX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2EY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2EZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2FX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2FY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2FZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IRB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXD     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXE     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXF     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2IXG     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2JA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2JK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2MB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2MC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2S       | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             | 12.2(31)SB13                        | 12.2(33)SB2;  |
| 12.2SB      |                                     | Available on  |
|             | 12.2(33)SB1                         | 26-SEP-08     |
|-------------+-------------------------------------+---------------|
| 12.2SBC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SCA     | 12.2(33)SCA1                        | 12.2(33)SCA1  |
|-------------+-------------------------------------+---------------|
| 12.2SE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SED     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEE     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEF     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SEG     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SGA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SM      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SO      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SRA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SRB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SRC     | 12.2(33)SRC2                        | 12.2(33)SRC2  |
|-------------+-------------------------------------+---------------|
| 12.2SU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SV      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SVA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SVC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SVD     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXD     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXE     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXF     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SXH     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2SZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2T       | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2TPC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XH      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XI      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XM      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XN      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XNA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XNB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XO      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XQ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XR      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XS      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XT      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XV      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2XW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YH      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YM      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YN      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YO      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YP      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YQ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YR      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YS      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YT      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YV      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2YZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZH      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZP      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             |                                     | 12.2(33)SB2;  |
| 12.2ZX      | Vulnerable; first fixed in 12.2SB   | Available on  |
|             |                                     | 26-SEP-08     |
|-------------+-------------------------------------+---------------|
| 12.2ZY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.2ZYA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|  Affected   |                                     |  Recommended  |
| 12.3-Based  |         First Fixed Release         |    Release    |
|  Releases   |                                     |               |
|-------------+-------------------------------------+---------------|
| 12.3        | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3B       | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             | 12.3(17b)BC6                        |               |
|             |                                     |               |
| 12.3BC      | 12.3(21a)BC1                        | 12.3(23)BC4   |
|             |                                     |               |
|             | 12.3(23)BC                          |               |
|-------------+-------------------------------------+---------------|
| 12.3BW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3EU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JEA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JEB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JEC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3JX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             | Note: Releases prior to 12.3(14)T3  | 12.4(15)T7    |
| 12.3T       | are vulnerable, release 12.3(14)T3  |               |
|             | and later are not vulnerable;       | 12.4(18c)     |
|-------------+-------------------------------------+---------------|
| 12.3TPC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3VA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|             |                                     | 12.2(33)SB2;  |
| 12.3XI      | 12.3(7)XI10a                        | Available on  |
|             |                                     | 26-SEP-08     |
|-------------+-------------------------------------+---------------|
| 12.3XJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XQ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XR      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XS      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3XZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YH      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YI      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YM      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YQ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YS      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YT      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YU      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3YZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.3ZA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
|  Affected   |                                     |  Recommended  |
| 12.4-Based  |         First Fixed Release         |    Release    |
|  Releases   |                                     |               |
|-------------+-------------------------------------+---------------|
|             | Note: Releases prior to 12.4(3) are |               |
| 12.4        | vulnerable, release 12.4(3) and     | 12.4(18c)     |
|             | later are not vulnerable;           |               |
|-------------+-------------------------------------+---------------|
| 12.4JA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JMA     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JMB     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JMC     | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4JX      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4MD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4MR      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4SW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4T       | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XA      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XB      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XC      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XD      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XE      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XF      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XG      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XJ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XK      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XL      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XM      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XN      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XP      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XQ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XR      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XT      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XV      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XW      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XY      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4XZ      | Not Vulnerable                      |               |
|-------------+-------------------------------------+---------------|
| 12.4YA      | Not Vulnerable                      |               |
+-------------------------------------------------------------------+

Workarounds
===========

Workarounds consist of filtering packets that are sent to 127.0.0.0/8
range and UDP packets that are sent to port 1975.

Using Interface Access Control Lists
+-----------------------------------

Access lists that filter UDP packets destined to port 1975 can be
used to mitigate this vulnerability. UDP port 1975 is a registered
port number that can be used by certain applications. However,
filtering all packets that are destined to UDP port 1975 may cause
some applications to malfunction. Therefore, access lists need to
explicitly deny UDP 1975 packets that are sent to any router
interface IP addresses and permit transit traffic. Such access lists
need to be applied on all interfaces to be effective. Since the IPC
channel uses addresses from the 127.0.0.0/8 range, it is also
necessary to filter packets that are sourced from or destined to this
range. An example is given below:

    access-list 100 deny udp any host <router-interface 1> eq 1975
    access-list 100 deny udp any host <router-interface 2> eq 1975
    access-list 100 deny udp any host <router-interface ...> eq 1975
    access-list 100 deny ip 127.0.0.0 0.255.255.255 any
    access-list 100 deny ip any 127.0.0.0 0.255.255.255
    access-list 100 permit ip any any

    interface Serial 0/0
      ip access-group 100 in

Using Control Plane Policing
+---------------------------

Control Plane Policing (CoPP) can be used to block untrusted UDP port
1975 access to the affected device. Cisco IOS software releases
12.2BC and 12.2SCA support the CoPP feature. CoPP may be configured
on a device to protect the management and control planes to minimize
the risk and effectiveness of direct infrastructure attacks by
explicitly permitting only authorized traffic sent to infrastructure
devices in accordance with existing security policies and
configurations. The following example can be adapted to your network.

Note: CoPP is not supported on uBR10012 series devices.


    !-- Permit all UDP/1975 traffic so that it
    !-- will be policed and dropped by the CoPP feature

    !
    access-list 111 permit udp any any eq 1975
    access-list 111 permit ip any 127.0.0.0 0.255.255.255
    access-list 111 permit ip 127.0.0.0 0.255.255.255 any
    !

    !-- Permit (Police or Drop)/Deny (Allow) all other Layer 3 and
    !-- Layer 4 traffic in accordance with existing security policies
    !-- and configurations for traffic that is authorized to be sent
    !-- to infrastructure devices

    !

    !-- Create a Class-Map for traffic to be policed by the CoPP
    !-- feature

    !
    class-map match-all drop-IPC-class
      match access-group 111
    !

    !-- Create a Policy-Map that will be applied to the Control-Plane
    !-- of the device

    !
    policy-map drop-IPC-traffic
      class drop-IPC-class
        drop
    !

    !-- Apply the Policy-Map to the Control-Plane of the device

    !
    control-plane
      service-policy input drop-IPC-traffic
    !

In the above CoPP example, the access control list entries (ACEs)
which match the potential exploit packets with the "permit" action
result in these packets being discarded by the policy-map "drop"
function, while packets that match the "deny" action (not shown) are
not affected by the policy-map drop function.

Please note that in the Cisco IOS 12.2S and 12.0S trains the
policy-map syntax is different:

    !
    policy-map drop-IPC-traffic class drop-IPC-class
      police 32000 1500 1500 conform-action drop exceed-action drop
    !

Additional information on the configuration and use of the CoPP
feature can be found at 
http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html,
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html
and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html

Using Infrastructure ACLs at Network Boundary
+--------------------------------------------

Although it is often difficult to block traffic transiting your
network, it is possible to identify traffic which should never be
allowed to target your infrastructure devices and block that traffic
at the border of your network. iACLs are a network security best
practice and should be considered as a long-term addition to good
network security as well as a workaround for this specific
vulnerability. The iACL example shown below should be included as
part of the deployed infrastructure access-list which will protect
all devices with IP addresses in the infrastructure IP address range:


    !-- Note: IPC packets sent to UDP destination port 1975 must not
    !--       be permitted from any trusted source as this traffic
    !--       should only be sent and received internally by the
    !--       affected device using an IP address allocated from the
    !--       127.0.0.0/8 prefix.
    !--
    !--       IPC that traffic that is internally generated and sent
    !--       and/or received by the affected device is not subjected
    !--       to packet filtering by the applied iACL policy.

    !

    !-- Deny IPC (UDP port 1975) packets from all sources destined to
    !-- all IP addresses configured on the affected device.

    !
    access-list 150 deny udp any host INTERFACE_ADDRESS#1 eq 1975
    access-list 150 deny udp any host INTERFACE_ADDRESS#2 eq 1975
    access-list 150 deny udp any host INTERFACE_ADDRESS#N eq 1975
    !

    !-- Deny all IP packets with a source or destination IP address 
    !-- from the 127.0.0.0/8 prefix.

    !
    access-list 150 deny ip 127.0.0.0 0.255.255.255 any
    access-list 150 deny ip any 127.0.0.0 0.255.255.255
    !


    !-- Permit/deny all other Layer 3 and Layer 4 traffic in accordance
    !-- with existing security policies and configurations.

    !

    !-- Permit all other traffic to transit the device.

    !
    access-list 150 permit ip any any
    !

    !-- Apply iACL to interfaces in the ingress direction.

    !
    interface GigabitEthernet0/0
      ip access-group 150 in
    !

Note: iACLs that filter UDP packets destined to port 1975 can be used
to mitigate this vulnerability. However, UDP port 1975 is a
registered port number that can be used by certain applications.
Filtering all packets that are destined to UDP port 1975 may cause
some applications to malfunction. Therefore, the iACL policy needs to
explicitly deny UDP packets using a destination port of 1975 that are
sent to any router interface IP addresses for affected devices, then
permit and/or deny all other Layer 3 and Layer 4 traffic in
accordance with existing security policies and configurations, and
then permit all other traffic to transit the device. iACLs must be
applied on all interfaces to be used effectively. Since the IPC
channel uses addresses from the 127.0.0.0/8 range, it is also
necessary to filter packets that are sourced from or destined to this
range as provided in the preceding example.

The white paper entitled "Protecting Your Core: Infrastructure
Protection Access Control Lists" presents guidelines and recommended
deployment techniques for infrastructure protection access lists.
This white paper can be obtained here:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml

Additional Mitigation Techniques
+-------------------------------

Additional mitigation techniques that can be deployed on Cisco
devices within the network are available in the Cisco Applied
Mitigation Bulletin companion document for this advisory, which is
available at the following link:

http://www.cisco.com/warp/public/707/cisco-amb-20080924-ipc-and-ubr.shtml

Obtaining Fixed Software
========================

Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should
consult their maintenance provider or check the software for feature
set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound
by the terms of Cisco's software license terms found at 
http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html,
or as otherwise set forth at Cisco.com Downloads at 
http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact psirt@cisco.com or security-alert@cisco.com for
software upgrades.

Customers with Service Contracts
+-------------------------------

Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com

Customers using Third Party Support Organizations
+------------------------------------------------

Customers whose Cisco products are provided or maintained through
prior or existing agreements with third-party support organizations,
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for guidance and assistance
with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific
customer situations, such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or
fix is the most appropriate for use in the intended network before it
is deployed.

Customers without Service Contracts
+----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.

  * +1 800 553 2447 (toll free from within North America)
  * +1 408 526 7209 (toll call from anywhere in the world)
  * e-mail: tac@cisco.com

Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to
a free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.

Exploitation and Public Announcements
=====================================

The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerability described in this advisory.

This vulnerability was found internally.

Status of this Notice: FINAL
============================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Distribution
============

This advisory is posted on Cisco's worldwide website at :

http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.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@cisco.com
  * first-bulletins@lists.first.org
  * bugtraq@securityfocus.com
  * vulnwatch@vulnwatch.org
  * cisco@spot.colorado.edu
  * cisco-nsp@puck.nether.net
  * full-disclosure@lists.grok.org.uk
  * comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.

Revision History
================

+---------------------------------------+
| Revision |             | Initial      |
| 1.0      | 2008-Sep-24 | public       |
|          |             | release.     |
+---------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at 
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
This includes instructions for press inquiries regarding Cisco 
security notices. All Cisco security advisories are available at 
http://www.cisco.com/go/psirt
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