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Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerabilities

Advisory ID: cisco-sa-20110928-sip

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

Revision 1.1

Last Updated  2012 September 21 19:22  UTC (GMT)

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


Summary

Multiple vulnerabilities exist in the Session Initiation Protocol (SIP) implementation in Cisco IOS Software and Cisco IOS XE Software that could allow an unauthenticated, remote attacker to cause a reload of an affected device or trigger memory leaks that may result in system instabilities. Affected devices would need to be configured to process SIP messages for these vulnerabilities to be exploitable.

Cisco has released free software updates that address these vulnerabilities. There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerabilities.

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

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

Cisco Unified Communications Manager is affected by one of the vulnerabilities described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerability that affects the Cisco Unified Communications Manager at the following location:

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

Affected Products

Vulnerable Products

Cisco devices are affected when they are running affected Cisco IOS Software and Cisco IOS XE Software versions that are configured to process SIP messages.

Recent versions of Cisco IOS Software do not process SIP messages by default. Creating a dial peer by issuing the dial-peer voice configuration command will start the SIP processes, causing the Cisco IOS device to process SIP messages. In addition, several features within Cisco Unified Communications Manager Express, such as ePhones, will also automatically start the SIP process when they are configured, causing the device to start processing SIP messages. An example of an affected configuration follows:

dial-peer voice <Voice dial-peer tag> voip
 ...
!

In addition to inspecting the Cisco IOS device configuration for a dial-peer command that causes the device to process SIP messages, administrators can also use the show processes | include SIP command to determine whether Cisco IOS Software is running the processes that handle SIP messages. In the following example, the presence of the processes CCSIP_UDP_SOCKET or CCSIP_TCP_SOCKET indicates that the Cisco IOS device will process SIP messages:

Router# show processes | include SIP
 149 Mwe 40F48254            4          1    400023108/24000  0 CCSIP_UDP_SOCKET
 150 Mwe 40F48034            4          1    400023388/24000  0 CCSIP_TCP_SOCKET

Note: Because there are several ways a device running Cisco IOS Software can start processing SIP messages, it is recommended that the show processes | include SIP command be used to determine whether the device is processing SIP messages instead of relying on the presence of specific configuration commands.

Cisco Unified Border Element images are also affected by two of these vulnerabilities.

Note: The Cisco Unified Border Element feature (CUBE; previously known as the Cisco Multiservice IP-to-IP Gateway) is a special Cisco IOS Software image that runs on Cisco multiservice gateway platforms. It provides a network-to-network interface point for billing, security, call admission control, quality of service, and signaling interworking.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 15.0(1)M1 with an installed image name of C3900-UNIVERSALK9-M:

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

!--- output truncated

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

Cisco IOS XE Software is affected by these vulnerabilities.

Note: Cisco Unified Communications Manager is affected by one of the vulnerabilities described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerability that affects the Cisco Unified Communications Manager at the following location:

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

Products Confirmed Not Vulnerable

The SIP Application Layer Gateway (ALG), which is used by the Cisco IOS Network Address Translation (NAT) and firewall features of Cisco IOS Software, is not affected by these vulnerabilities.

Cisco IOS XR Software is not affected by these vulnerabilities.

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

Details

SIP is a popular signaling protocol that is used to manage voice and video calls across IP networks such as the Internet. SIP is responsible for handling all aspects of call setup and termination. Voice and video are the most popular types of sessions that SIP handles, but the protocol has the flexibility to accommodate other applications that require call setup and termination. SIP call signaling can use UDP (port 5060), TCP (port 5060), or Transport Layer Security (TLS; TCP port 5061) as the underlying transport protocol.

Multiple vulnerabilities exist in the SIP implementation in Cisco IOS Software that could allow a remote attacker to cause an affected device to reload or to trigger memory leaks that may result in system instabilities. These vulnerabilities are triggered when the device that is running Cisco IOS Software processes crafted SIP messages. Only traffic destined to the device can trigger the vulnerabilities; transit SIP traffic is not an exploit vector.

Note: In cases where SIP is running over TCP transport, a TCP three-way handshake is necessary to exploit these vulnerabilities.

The vulnerabilities are as follow:

CSCth03022 (registered customers only) may cause a reload of an affected device. This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-0939.

CSCti48504 (registered customers only) may cause memory leaks. This vulnerability has been assigned CVE ID CVE-2011-3275.

CSCto88686 (registered customers only) may cause memory leaks or reloads of affected devices. This vulnerability has been assigned CVE ID CVE-2011-2072.

Note: this vulnerability also affects Cisco Unified Communications Manager. The corresponding Cisco bug ID is CSCtl86047 (registered customers only) . Refer to the separate Cisco Security Advisory for the Cisco Unified Communications Manager for additional details.

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 .






CSCto88686

Calculate the environmental score of CSCto88686

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





CSCti48504

Calculate the environmental score of CSCti48504

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





CSCth03022

Calculate the environmental score of CSCth03022

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 vulnerabilities in this advisory may result in system instabilities or a reload of an affected device. Repeated exploitation could result in a sustained denial of service 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.

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

Not vulnerable

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

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2B

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

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

Not vulnerable

Vulnerable; migrate to any release in 12.2IRG

12.2IRB

Not vulnerable

Vulnerable; migrate to any release in 12.2IRG

12.2IRC

Not vulnerable

Vulnerable; migrate to any release in 12.2IRG

12.2IRD

Not vulnerable

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

12.2IRE

Not vulnerable

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

12.2IRF

Not vulnerable

Vulnerable; migrate to any release in 12.2IRG

12.2IRG

Not vulnerable

Not vulnerable

12.2IXA

Not vulnerable

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

12.2IXB

Not vulnerable

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

12.2IXC

Not vulnerable

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

12.2IXD

Not vulnerable

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

12.2IXE

Not vulnerable

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

12.2IXF

Not vulnerable

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

12.2IXG

Not vulnerable

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

12.2IXH

Not vulnerable

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

Not vulnerable

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

Not vulnerable

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

Not vulnerable

12.2(31)SB20

12.2(33)SB10

12.2SBC

Not vulnerable

Vulnerable; First fixed in Release 12.2SB

12.2SCA

Not vulnerable

Vulnerable; First fixed in Release 12.2SCC

12.2SCB

Not vulnerable

Vulnerable; First fixed in Release 12.2SCC

12.2SCC

Not vulnerable

12.2(33)SCC7

12.2SCD

Not vulnerable

12.2(33)SCD6

12.2SCE

Not vulnerable

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

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

Not vulnerable

Vulnerable; First fixed in Release 12.2SRD

12.2SRB

Not vulnerable

Vulnerable; First fixed in Release 12.2SRD

12.2SRC

Not vulnerable

Vulnerable; First fixed in Release 12.2SRD

12.2SRD

Not vulnerable

12.2(33)SRD6

12.2SRE

Not vulnerable

12.2(33)SRE4

12.2STE

Not vulnerable

Not vulnerable

12.2SU

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2SV

Not vulnerable

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

Not vulnerable

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

12.2SX

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2SXA

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2SXB

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2SXD

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2SXE

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2SXF

Not vulnerable

12.2(18)SXF17b

12.2SXH

Not vulnerable

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

12.2SXI

Not vulnerable

12.2(33)SXI6

12.2SXJ

Not vulnerable

12.2(33)SXJ1

12.2SY

Not vulnerable

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

12.2SZ

Not vulnerable

Vulnerable; First fixed in Release 12.2SB

12.2T

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2TPC

Not vulnerable

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

Not vulnerable

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

See Cisco IOS-XE Software Availability

See Cisco IOS-XE Software Availability

12.2XNB

See Cisco IOS-XE Software Availability

See Cisco IOS-XE Software Availability

12.2XNC

See Cisco IOS-XE Software Availability

See Cisco IOS-XE Software Availability

12.2XND

See Cisco IOS-XE Software Availability

See Cisco IOS-XE Software Availability

12.2XNE

See Cisco IOS-XE Software Availability

See Cisco IOS-XE Software Availability

12.2XNF

See Cisco IOS-XE Software Availability

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

Not vulnerable

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

Not vulnerable

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

Not vulnerable

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

12.2YJ

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

Not vulnerable

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

12.2YM

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2YN

Not vulnerable

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

Not vulnerable

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

12.2YT

Not vulnerable

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

12.2YU

Not vulnerable

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

12.2YV

Not vulnerable

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

12.2YW

Not vulnerable

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

12.2YX

Not vulnerable

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

12.2YY

Not vulnerable

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

12.2YZ

Not vulnerable

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

12.2ZA

Not vulnerable

Vulnerable; First fixed in Release 12.2SXF

12.2ZB

Not vulnerable

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

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2ZF

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2ZG

Not vulnerable

Not vulnerable

12.2ZH

Not vulnerable

Vulnerable; First fixed in Release 12.4

12.2ZJ

Not vulnerable

Not vulnerable

12.2ZL

Not vulnerable

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

Not vulnerable

Vulnerable; First fixed in Release 12.2SXH

12.2ZX

Not vulnerable

Not vulnerable

12.2ZY

Not vulnerable

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

12.2ZYA

Not vulnerable

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

There are no affected 12.3 based releases

Affected 12.4-Based Releases

First Fixed Release

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

12.4

Not vulnerable

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

Releases up to and including 12.4(6)MR1 are not vulnerable.

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

12.4MRA

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

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

12.4MRB

Vulnerable; First fixed in Release 12.4T

Vulnerable; First fixed in Release 12.4T

12.4SW

Not vulnerable

Not vulnerable

12.4T

12.4(24)T6

12.4(15)T16

12.4(24)T6

12.4(15)T16

12.4XA

Not vulnerable

Vulnerable; First fixed in Release 12.4T

12.4XB

Not vulnerable

12.4(2)XB12

12.4XC

Vulnerable; First Fixed in Release 12.4T

Not vulnerable

12.4XD

Not vulnerable

Vulnerable; First fixed in Release 12.4T

12.4XE

Not vulnerable

Vulnerable; First Fixed in Release 12.4T

Not vulnerable

12.4XF

Not vulnerable

Vulnerable; First fixed in Release 12.4T

12.4XG

Releases up to and including 12.4(9)XG1 are not vulnerable.

Releases 12.4(9)XG3 and later are not vulnerable. First fixed in Release 12.4T

Vulnerable; First fixed in Release 12.4T

12.4XJ

Not vulnerable

Vulnerable; First Fixed in Release 12.4T

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

Not vulnerable

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

12.4XP

Not vulnerable

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

Not vulnerable

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 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)M7

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

Not vulnerable

Cisco IOS XE devices: See Cisco IOS-XE Software Availability

15.0(1)S4

Cisco IOS XE devices: 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: See Cisco IOS-XE Software Availability

Cisco IOS XE devices: 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: See Cisco IOS-XE Software Availability

Cisco IOS XE devices: 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

Vulnerable; First fixed in Release 15.1T

Vulnerable; First fixed in Release 15.1T

15.1M

15.1(4)M1

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

Not vulnerable

Cisco IOS XE devices: See Cisco IOS-XE Software Availability

15.1(2)S2

15.1(3)S

Cisco IOS XE devices: See Cisco IOS-XE Software Availability

15.1T

15.1(2)T4

15.1(3)T2

15.1(2)T4 15.1(1)T4 on 8-Dec-2011

15.1XB

15.1(4)XB5

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 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

3.1.3S

Vulnerable; migrate to 3.3.2S or later

2.6.x

3.1.3S

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, available at http://www.cisco.com/en/US/docs/ios/ios_xe/2/release/notes/rnasr21.html#wp2310700, http://www.cisco.com/en/US/docs/ios/ios_xe/3/release/notes/asr1k_rn_3s_sys_req.html#wp2999052 and http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_24726.html#wp2570252 respectively.

Cisco IOS XR System Software

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



Workarounds

If the affected Cisco IOS device requires SIP for VoIP services, SIP cannot be disabled, and no workarounds are available. Users are advised to apply mitigation techniques to help limit exposure to the vulnerabilities. Mitigation consists of allowing only legitimate devices to connect to affected devices. To increase effectiveness, the mitigation must be coupled with anti-spoofing measures on the network edge. This action is required because SIP can use UDP as the transport protocol.

Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Cisco Applied Mitigation Bulletin:Identifying and Mitigating Exploitation of the Multiple Vulnerabilities in Cisco Voice Products", which is available at the following location: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20110928-voice.

Disabling SIP Listening Ports

For devices that do not require SIP to be enabled, the simplest and most effective workaround is to disable SIP processing on the device. Some versions of Cisco IOS Software allow administrators to disable SIP with the following commands:

sip-ua
 no transport udp
 no transport tcp
 no transport tcp tls

warningWarning: When applying this workaround to devices that are processing Media Gateway Control Protocol (MGCP) or H.323 calls, the device will not stop SIP processing while active calls are being processed. Under these circumstances, this workaround should be implemented during a maintenance window when active calls can be briefly stopped.

The show udp connections, show tcp brief all, and show processes | include SIP commands can be used to confirm that the SIP UDP and TCP ports are closed after applying this workaround.

Depending on the Cisco IOS Software version in use, when SIP is disabled the output from the show ip sockets command may still show the SIP ports open, but sending traffic to them will cause the SIP process to emit the following message:

*Jun 2 11:36:47.691: sip_udp_sock_process_read: SIP UDP Listener is DISABLED

Control Plane Policing

For devices that need to offer SIP services, it is possible to use Control Plane Policing (CoPP) to block SIP traffic to the device from untrusted sources. Cisco IOS 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 only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. The following example can be adapted to specific network configurations:

!-- The 192.168.1.0/24 network and the 172.16.1.1 host are trusted.
!-- Everything else is not trusted. The following access list is used
!-- to determine what traffic needs to be dropped by a control plane
!-- policy (the CoPP feature): if the access list matches (permit)
!-- then traffic will be dropped and if the access list does not
!-- match (deny) then traffic will be processed by the router.
access-list 100 deny udp 192.168.1.0 0.0.0.255 any eq 5060
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5060
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5061
access-list 100 deny udp host 172.16.1.1 any eq 5060
access-list 100 deny tcp host 172.16.1.1 any eq 5060
access-list 100 deny tcp host 172.16.1.1 any eq 5061
access-list 100 permit udp any any eq 5060
access-list 100 permit tcp any any eq 5060
access-list 100 permit tcp any any eq 5061

!-- 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-sip-class
  match access-group 100

!-- Create a Policy-Map that will be applied to the
!-- Control-Plane of the device.
policy-map control-plane-policy
 class drop-sip-class
  drop

!-- Apply the Policy-Map to the Control-Plane of the
!-- device.
control-plane
 service-policy input control-plane-policy

Note: Because SIP can use UDP as a transport protocol, it is possible to spoof the source address of an IP packet, which may bypass access control lists that permit communication to these ports from trusted IP addresses.

In the above CoPP example, the access control 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. 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 and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html.

Obtaining Fixed Software

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

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

Do not contact psirt@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 vulnerabilities described in this advisory.

These vulnerabilities were discovered by Cisco during internal testing.

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-sip

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.