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Cisco IOS Software Data-Link Switching Vulnerability

Advisory ID: cisco-sa-20110928-dlsw

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-dlsw

Revision 1.1

Last Updated  2012 September 21 19:18  UTC (GMT)

For Public Release 2011 September 28 16:00  UTC (GMT)


Summary

Cisco IOS Software contains a memory leak vulnerability in the Data-Link Switching (DLSw) feature that could result in a device reload when processing crafted IP Protocol 91 packets.

Cisco has released free software updates that address this vulnerability.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-dlsw.

Note: The September 28, 2011, Cisco IOS Software Security Advisory bundled publication includes ten Cisco Security Advisories. Nine of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the September 2011 Bundled Publication.

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html


Affected Products

Vulnerable Products

Cisco IOS devices with the DLSw promiscuous feature enabled are affected by the vulnerability described in this advisory. Devices with the DLSw promiscuous feature enabled contain a line in the configuration defining a local DLSw peer with the promiscuous keyword. This configuration can be observed by issuing the command show running-config. Systems configured with the DLSw promiscuous feature enabled contain a line similar to one of the following:

dlsw local-peer promiscuous

or

dlsw local-peer peer-id <IP address> promiscuous

To determine the software that runs on a Cisco IOS device, log in to the device and issue the show version command to display the system banner. Cisco IOS Software identifies itself as "Cisco Internetwork Operating System Software" or "Cisco IOS Software." Other Cisco devices do not have the show version command or give different output.

The following example shows output from a device running IOS version 15.0(1)M1:

Router> show version
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 02-Dec-09 17:17 by prod_rel_team

Additional information about Cisco IOS Software release naming conventions is available in the white paper Cisco IOS and NX-OS Software Reference Guide at: http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by these vulnerabilities.

Details

DLSw provides a means of transporting IBM Systems Network Architecture (SNA) and network BIOS (NetBIOS) traffic over an IP network. The Cisco implementation of DLSw over Fast Sequence Transport (FST) uses IP Protocol 91. The promiscuous DLSw feature permits the local peer to establish connection with remote peers that are not statically configured.

A Cisco IOS device that is configured for DLSw listens for IP protocol 91 packets. Depending on the DLSw configuration, UDP port 2067, and, one or more TCP ports can also be opened. The vulnerability described in this document can only be exploited via IP Protocol 91 and can not be exploited using either the UDP or TCP transports.

Devices with only statically configured DLSw peers are not affected by this vulnerability.

This vulnerability is documented in Cisco bug ID CSCth69364 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-0945.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability 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 .



CSCth69364

Calculate the environmental score of CSCth69364

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the vulnerability may result in a memory leak that can lead to a denial of service condition. Memory exhaustion can cause an affected Cisco IOS device to reload or become unresponsive; a power cycle might be required to recover from the condition.

To identify the memory leak caused by this vulnerability, issue the show dlsw peers | include FST.*DISCONN command; a monotonically increasing list of FST peers that remain in the DISCONN state indicates that memory is being held, as shown in the following example:

Router> show dlsw peers | include FST.*DISCONN
FST 176.74.146.194  DISCONN          1         0  prom      0    -   -        -
FST 9.180.128.186   DISCONN          1         0  prom      0    -   -        -
FST 139.71.105.39   DISCONN          1         0  prom      0    -   -        -
FST 138.150.39.18   DISCONN          1         0  prom      0    -   -        -
FST 253.240.220.167 DISCONN          1         0  prom      0    -   -        -
FST 252.186.119.224 DISCONN          1         0  prom      0    -   -        -
FST 41.255.172.252  DISCONN          1         0  prom      0    -   -        -
! --- Output truncated
Router> 

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.

Additionally, the Cisco IOS Software Checker is available on the Cisco Security Intelligence Operations (SIO) portal at http://tools.cisco.com/security/center/selectIOSVersion.x. It provides several features for checking which Security Advisories affect specified versions of Cisco IOS Software.

Cisco IOS Software

Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release For This Advisory column. The First Fixed Release for All Advisories in the September 2011 Bundled Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.

Major Release

     Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

There are no affected 12.0-based releases

Affected 12.1-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

12.1E

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

Affected 12.2-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

12.2

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2B

Vulnerable; first fixed in Release 12.4

Releases up to and including 12.2(2)B7 are not vulnerable.

Vulnerable; first fixed in Release 12.4

12.2BC

Not vulnerable

Vulnerable; first fixed in Release 12.4

12.2BW

Not vulnerable

Not vulnerable

12.2BX

Vulnerable; first fixed in Release 12.2SB

Releases up to and including 12.2(15)BX are not vulnerable.

Vulnerable; first fixed in Release 12.2SB

12.2BY

Not vulnerable

Not vulnerable

12.2BZ

Not vulnerable

Not vulnerable

12.2CX

Not vulnerable

Vulnerable; first fixed in Release 12.4

12.2CY

Not vulnerable

Not vulnerable

12.2CZ

Not vulnerable

Vulnerable; first fixed in Release 12.2SB

12.2DA

Not vulnerable

Not vulnerable

12.2DD

Not vulnerable

Not vulnerable

12.2DX

Not vulnerable

Not vulnerable

12.2EU

Not vulnerable

Not vulnerable

12.2EW

Not vulnerable

Releases up to and including 12.2(20)EW4 are not vulnerable.

12.2EWA

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2EX

Not vulnerable

12.2(55)EX3

12.2EY

Not vulnerable

12.2(58)EY

12.2EZ

Not vulnerable

Vulnerable; migrate to any release in 15.0SE

12.2FX

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2FY

Not vulnerable

Vulnerable; first fixed in Release 12.2EX

12.2FZ

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2IRA

Vulnerable; migrate to any release in 12.2IRG

Vulnerable; migrate to any release in 12.2IRG

12.2IRB

Vulnerable; migrate to any release in 12.2IRG

Vulnerable; migrate to any release in 12.2IRG

12.2IRC

Vulnerable; migrate to any release in 12.2IRG

Vulnerable; migrate to any release in 12.2IRG

12.2IRD

12.2(33)IRD1

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IRE

12.2(33)IRE3

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IRF

Vulnerable; migrate to any release in 12.2IRG

Vulnerable; migrate to any release in 12.2IRG

12.2IRG

Not vulnerable

Not vulnerable

12.2IXA

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXB

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXC

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXD

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXE

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXF

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXG

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2IXH

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2JA

Not vulnerable

Not vulnerable

12.2JK

Not vulnerable

Not vulnerable

12.2MB

Not vulnerable

Not vulnerable

12.2MC

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2MRA

Not vulnerable

Vulnerable; first fixed in Release 12.2SRD

12.2MRB

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2S

Releases prior to 12.2(30)S are vulnerable; Releases 12.2(30)S and later are not vulnerable. First fixed in Release 12.2SB

Releases prior to 12.2(30)S are vulnerable; Releases 12.2(30)S and later are not vulnerable. First fixed in Release 12.2SB

12.2SB

12.2(31)SB20

12.2(33)SB10

12.2(31)SB20

12.2(33)SB10

12.2SBC

Vulnerable; first fixed in Release 12.2SB

Vulnerable; first fixed in Release 12.2SB

12.2SCA

Vulnerable; first fixed in Release 12.2SCC

Vulnerable; first fixed in Release 12.2SCC

12.2SCB

Vulnerable; first fixed in Release 12.2SCC

Vulnerable; first fixed in Release 12.2SCC

12.2SCC

12.2(33)SCC7

12.2(33)SCC7

12.2SCD

12.2(33)SCD6

12.2(33)SCD7

12.2(33)SCD6

12.2SCE

12.2(33)SCE1

12.2(33)SCE2

12.2(33)SCE112.2(33)SCE2

12.2SCF

Not vulnerable

Not vulnerable

12.2SE

Not vulnerable

12.2(55)SE312.2(58)SE

12.2SEA

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SEB

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SEC

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SED

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SEE

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SEF

Not vulnerable

Vulnerable; first fixed in Release 12.2SE

12.2SEG

Not vulnerable

Releases prior to 12.2(25)SEG4 are vulnerable; Releases 12.2(25)SEG4 and later are not vulnerable. First fixed in Release 12.2EX

12.2SG

Releases prior to 12.2(40)SG are vulnerable; Releases 12.2(40)SG and later are not vulnerable.

Releases prior to 12.2(53)SG4 are vulnerable; Releases 12.2(53)SG4 and later are not vulnerable.

12.2SGA

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2SL

Not vulnerable

Not vulnerable

12.2SM

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2SO

Not vulnerable

Not vulnerable

12.2SQ

Not vulnerable

12.2(50)SQ3

12.2SRA

Vulnerable; first fixed in Release 12.2SRD

Vulnerable; first fixed in Release 12.2SRD

12.2SRB

Vulnerable; first fixed in Release 12.2SRD

Vulnerable; first fixed in Release 12.2SRD

12.2SRC

Vulnerable; first fixed in Release 12.2SRD

Vulnerable; first fixed in Release 12.2SRD

12.2SRD

12.2(33)SRD6

12.2(33)SRD6

12.2SRE

12.2(33)SRE3

12.2(33)SRE4

12.2STE

Not vulnerable

Not vulnerable

12.2SU

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2SV

Releases prior to 12.2(29a)SV are vulnerable; Releases 12.2(29a)SV and later are not vulnerable. Migrate to any release in 12.2SVD

Releases prior to 12.2(29a)SV are vulnerable; Releases 12.2(29a)SV and later are not vulnerable. Migrate to any release in 12.2SVD

12.2SVA

Not vulnerable

Not vulnerable

12.2SVC

Not vulnerable

Not vulnerable

12.2SVD

Not vulnerable

Not vulnerable

12.2SVE

Not vulnerable

Not vulnerable

12.2SW

Releases prior to 12.2(25)SW12 are vulnerable; Releases 12.2(25)SW12 and later are not vulnerable.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2SX

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2SXA

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2SXB

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2SXD

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2SXE

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2SXF

12.2(18)SXF17b

12.2(18)SXF17b

12.2SXH

12.2(33)SXH8a

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2SXI

12.2(33)SXI6

12.2(33)SXI6

12.2SXJ

Not vulnerable

12.2(33)SXJ1

12.2SY

12.2(50)SY

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2SZ

Vulnerable; first fixed in Release 12.2SB

Vulnerable; first fixed in Release 12.2SB

12.2T

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2TPC

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2XA

Not vulnerable

Not vulnerable

12.2XB

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2XC

Not vulnerable

Not vulnerable

12.2XD

Not vulnerable

Not vulnerable

12.2XE

Not vulnerable

Not vulnerable

12.2XF

Not vulnerable

Not vulnerable

12.2XG

Not vulnerable

Not vulnerable

12.2XH

Not vulnerable

Not vulnerable

12.2XI

Not vulnerable

Not vulnerable

12.2XJ

Not vulnerable

Not vulnerable

12.2XK

Not vulnerable

Not vulnerable

12.2XL

Not vulnerable

Not vulnerable

12.2XM

Not vulnerable

Not vulnerable

12.2XN

Not vulnerable

Not vulnerable

12.2XNA

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNB

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNC

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XND

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNE

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNF

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XO

Not vulnerable

Releases prior to 12.2(54)XO are vulnerable; Releases 12.2(54)XO and later are not vulnerable.

12.2XQ

Not vulnerable

Not vulnerable

12.2XR

Not vulnerable

Not vulnerable

12.2XS

Not vulnerable

Not vulnerable

12.2XT

Not vulnerable

Not vulnerable

12.2XU

Not vulnerable

Not vulnerable

12.2XV

Not vulnerable

Not vulnerable

12.2XW

Not vulnerable

Not vulnerable

12.2YA

Releases prior to 12.2(4)YA8 are vulnerable; Releases 12.2(4)YA8 and later are not vulnerable. First fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2YB

Not vulnerable

Not vulnerable

12.2YC

Not vulnerable

Not vulnerable

12.2YD

Not vulnerable

Not vulnerable

12.2YE

Not vulnerable

Not vulnerable

12.2YF

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YG

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YH

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YJ

Releases prior to 12.2(8)YJ1 are vulnerable; Releases 12.2(8)YJ1 and later are not vulnerable.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YK

Not vulnerable

Not vulnerable

12.2YL

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YM

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2YN

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YO

Not vulnerable

Not vulnerable

12.2YP

Not vulnerable

Not vulnerable

12.2YQ

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YR

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YS

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YT

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YU

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YV

Releases prior to 12.2(11)YV1 are vulnerable; Releases 12.2(11)YV1 and later are not vulnerable.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YW

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YX

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YY

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2YZ

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2ZA

Vulnerable; first fixed in Release 12.2SXF

Vulnerable; first fixed in Release 12.2SXF

12.2ZB

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2ZC

Not vulnerable

Not vulnerable

12.2ZD

Not vulnerable

Not vulnerable

12.2ZE

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2ZF

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2ZG

Not vulnerable

Not vulnerable

12.2ZH

Releases prior to 12.2(13)ZH6 are vulnerable; Releases 12.2(13)ZH6 and later are not vulnerable. First fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.2ZJ

Not vulnerable

Not vulnerable

12.2ZL

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2ZP

Not vulnerable

Not vulnerable

12.2ZU

Vulnerable; first fixed in Release 12.2SXH

Vulnerable; first fixed in Release 12.2SXH

12.2ZX

Not vulnerable

Not vulnerable

12.2ZY

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.2ZYA

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Affected 12.3-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

12.3

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3B

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3BC

Not vulnerable

Vulnerable; first fixed in Release 12.2SCC

12.3BW

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3JA

Not vulnerable

Not vulnerable

12.3JEA

Not vulnerable

Not vulnerable

12.3JEB

Not vulnerable

Not vulnerable

12.3JEC

Not vulnerable

Not vulnerable

12.3JED

Not vulnerable

Not vulnerable

12.3JK

Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable. First fixed in Release 12.4

Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable. First fixed in Release 12.4

12.3JL

Not vulnerable

Not vulnerable

12.3JX

Not vulnerable

Not vulnerable

12.3T

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3TPC

Releases up to and including 12.3(4)TPC11a are not vulnerable.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3VA

Not vulnerable

Not vulnerable

12.3XA

Releases prior to 12.3(2)XA7 are vulnerable; Releases 12.3(2)XA7 and later are not vulnerable. First fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XB

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3XC

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XD

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XE

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XF

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3XG

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XI

Vulnerable; first fixed in Release 12.2SB

Vulnerable; first fixed in Release 12.2SB

12.3XJ

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3XK

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XL

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.3XQ

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XR

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XS

Not vulnerable

Vulnerable; first fixed in Release 12.4

12.3XU

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.3XW

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3XX

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3XY

Not vulnerable

Not vulnerable

12.3XZ

Vulnerable; first fixed in Release 12.4

Vulnerable; first fixed in Release 12.4

12.3YA

Not vulnerable

Vulnerable; first fixed in Release 12.4

12.3YD

Not vulnerable

Not vulnerable

12.3YF

Not vulnerable

Not vulnerable

12.3YG

Not vulnerable

Not vulnerable

12.3YH

Not vulnerable

Not vulnerable

12.3YI

Not vulnerable

Not vulnerable

12.3YJ

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.3YK

Not vulnerable

Not vulnerable

12.3YM

Not vulnerable

Not vulnerable

12.3YQ

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.3YS

Vulnerable; first fixed in Release 12.4T

Releases up to and including 12.3(11)YS1 are not vulnerable.

Vulnerable; first fixed in Release 12.4T

12.3YT

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.3YU

Vulnerable; first fixed in Release 12.4XB

Vulnerable; first fixed in Release 12.4XB

12.3YX

Vulnerable; migrate to any release in 12.4XR

Vulnerable; first fixed in Release 12.4T

12.3YZ

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.3ZA

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

Affected 12.4-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

12.4

12.4(25e)

12.4(25f)

12.4GC

12.4(24)GC4

12.4(24)GC4

12.4JA

Not vulnerable

Not vulnerable

12.4JAX

Not vulnerable

Not vulnerable

12.4JDA

Not vulnerable

Not vulnerable

12.4JDC

Not vulnerable

Not vulnerable

12.4JHA

Not vulnerable

Not vulnerable

12.4JHB

Not vulnerable

Not vulnerable

12.4JHC

Not vulnerable

Not vulnerable

12.4JK

Not vulnerable

Not vulnerable

12.4JL

Not vulnerable

Not vulnerable

12.4JMA

Not vulnerable

Not vulnerable

12.4JMB

Not vulnerable

Not vulnerable

12.4JX

Not vulnerable

Vulnerable; migrate to any release in 12.4JA

Releases up to and including 12.4(21a)JX are not vulnerable.

12.4JY

Not vulnerable

Not vulnerable

12.4MD

Not vulnerable

12.4(24)MD6 on 28-Oct-2011

12.4MDA

Not vulnerable

12.4(24)MDA7

12.4MDB

Not vulnerable

12.4(24)MDB3

12.4MR

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4MRA

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4MRB

Not vulnerable

Vulnerable; first fixed in Release 12.4T

12.4SW

Not vulnerable

Not vulnerable

12.4T

12.4(15)T15

12.4(24)T5

12.4(15)T16

12.4(24)T6

12.4XA

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XB

12.4(2)XB12

12.4(2)XB12

12.4XC

Not vulnerable

Not vulnerable

12.4XD

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XE

Not vulnerable

Not vulnerable

12.4XF

Not vulnerable

Vulnerable; first fixed in Release 12.4T

12.4XG

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XJ

Not vulnerable

Not vulnerable

12.4XK

Not vulnerable

Not vulnerable

12.4XL

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4XM

Releases up to and including 12.4(15)XM are not vulnerable.

Releases 12.4(15)XM3 and later are not vulnerable. First fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XN

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4XP

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4XQ

Not vulnerable

Vulnerable; first fixed in Release 12.4T

12.4XR

Not vulnerable

Vulnerable; first fixed in Release 12.4T

12.4XT

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XV

Not vulnerable

Not vulnerable

12.4XW

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XY

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4XZ

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4YA

Vulnerable; first fixed in Release 12.4T

Vulnerable; first fixed in Release 12.4T

12.4YB

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4YD

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

12.4YE

Not vulnerable

Vulnerable; fixed in 12.4(22)YE6 on 30-Sept-2011; 12.4(24)YE7 available on 17-Oct-2011

12.4YG

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

Affected 15.0-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

15.0M

15.0(1)M4

15.0(1)M5a

15.0(1)M7

15.0MR

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

15.0MRA

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

15.0S

15.0(1)S3a

15.0(1)S4

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

15.0(1)S4

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

15.0SA

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

15.0SE

Not vulnerable

Not vulnerable

15.0SG

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

15.0XA

Vulnerable; first fixed in Release 15.1T

Vulnerable; first fixed in Release 15.1T

15.0XO

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

Affected 15.1-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

15.1EY

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

15.1GC

Not vulnerable

Vulnerable; first fixed in Release 15.1T

15.1M

Not vulnerable

15.1(4)M2; Available on 30-SEP-11

15.1MR

Not vulnerable

Vulnerable; contact your support organization per the instructions in the Obtaining Fixed Software section of this advisory.

15.1S

15.1(1)S1

15.1(2)S

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

15.1(2)S2

15.1(3)S

Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability

15.1T

15.1(1)T3

15.1(2)T2

15.1(3)T

15.1(1)T4 on 09-DEC-2011

15.1(2)T4

15.1(3)T2

15.1XB

Vulnerable; first fixed in Release 15.1T

Vulnerable; first fixed in Release 15.1T

Affected 15.2-Based Releases

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

There are no affected 15.2-based releases

Cisco IOS XE Software

Cisco IOS XE Software is affected by the vulnerability disclosed in this document.

Cisco IOS XE Release

First Fixed Release

First Fixed Release for All Advisories in the September 2011 Bundled Publication

2.1.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

2.2.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

2.3.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

2.4.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

2.5.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

2.6.x

Not vulnerable

Vulnerable; migrate to 3.3.2S or later

3.1.xS

3.1.3S

Vulnerable; migrate to 3.3.2S or later

3.1.xSG

Not vulnerable

Vulnerable; migrate to 3.2.0SG or later

3.2.xS

3.2.1S

Vulnerable; migrate to 3.3.2S or later

3.2.xSG

Not vulnerable

Not vulnerable

3.3.xS

Not vulnerable

3.3.2S

3.4.xS

Not vulnerable

Not vulnerable

For mapping of Cisco IOS XE to Cisco IOS releases, please refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.

Cisco IOS XR Software

Cisco IOS XR Software is not affected by any of the vulnerabilities in the September 2011 bundled publication.

Workarounds

This vulnerability can be mitigated by using Control Plane Policing (CoPP) to only allow IP Protocol 91 packets sent by valid peers.

Mitigation techniques that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20110928-dlsw.

Control Plane Policing

Control Plane Policing (CoPP) can be used to block untrusted IP Protocol 91 packets sent to the affected device. Cisco IOS Software Releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T 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, and if configured, rate-limiting only authorized traffic that is sent to infrastructure devices in accordance with existing security policies and configurations. The following example, which uses 192.168.100.1 to represent a trusted host, can be adapted to your network.


 !-- Deny FST traffic on IP protocol 91 from trusted !-- hosts to all IP addresses configured on all interfaces of the affected device !-- so that it will be allowed by the CoPP feature


access-list 111 deny 91 host 192.168.100.1 any 


!-- Permit all other FST traffic on IP protocol 91 !-- sent to all IP addresses configured on all interfaces of the affected !-- device so that it will be policed and dropped by the CoPP feature


access-list 111 permit 91 any any 


!-- Permit (Police or Drop)/Deny (Allow) all other Layer3 !-- and Layer4 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-fst-91-class
  match access-group 111


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


policy-map input-CoPP-policy
  class drop-fst-91-class
    drop


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


control-plane
  service-policy input input-CoPP-policy

In the above CoPP example, the access control list entries (ACEs) that 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. Note that in the 12.2S and 12.0S Cisco IOS trains the policy-map syntax is different, as shown in the following example:

policy-map input-CoPP-policy
  class drop-fst-91-class
    police 32000 1500 1500 conform-action drop exceed-action drop

Additional information on the CoPP feature is available at: Control Plane Policing Implementation Best Practices

Obtaining Fixed Software

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

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@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/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

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

This vulnerability was reported to Cisco by {insert info here}.

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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-dlsw

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-teams@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 1.1

2011-September-30

Update IOS Software table bundled publication first fixed information.

Revision 1.0

2011-September-28

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/web/about/security/psirt/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.