Cisco Unified Communications Manager contains a vulnerability in its Session Initiation Protocol (SIP) implementation that could allow an unauthenticated, remote attacker to cause a critical service to fail, which could interrupt voice services. Affected devices must be configured to process SIP messages for this vulnerability to be exploitable. Cisco has released software updates that address this vulnerability. A workaround exists for customers who do not require SIP in their environment. This advisory is available at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-cucm. Note: The September 26, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Eight of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2012 bundled publication. Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep12.html Cisco IOS Software and Cisco IOS XE Software are affected by the vulnerability described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerability that affects Cisco IOS Software and Cisco IOS XE Software at the following location: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-sip
Note: The September 26, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Eight of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2012 bundled publication.
Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep12.html
Cisco IOS Software and Cisco IOS XE Software are affected by the vulnerability described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerability that affects Cisco IOS Software and Cisco IOS XE Software at the following location:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-sip
Note: Cisco Unified Communications Manager version 6.1 reached the End of Software Maintenance on September 3, 2011. Customers using Cisco Unified Communications Manager 6.x versions should contact their Cisco support team for assistance in upgrading to a supported version of Cisco Unified Communications Manager.
Note: Cisco IOS Software and Cisco IOS XE Software are affected by the vulnerability described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerability that affects Cisco IOS Software and Cisco IOS XE Software at the following location:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-sip
Note: In cases where SIP is running over TCP transport, a TCP three-way handshake is necessary to exploit this vulnerability.
This vulnerability is documented in Cisco bug IDs CSCtw66721 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-3949.A workaround exists for customers who do not require SIP in their environment. Cisco Unified Communication Manager versions 6.1(4), 7.1(2), and 8.0(1) introduced the ability to disable SIP processing. SIP processing is enabled by default. Use the following instructions to disable SIP processing:
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Cisco Unified Communication Manager Version | First Fixed Release |
Recommended Release |
7.x | 7.1(5b)su5 | 7.1(5b)su5 |
8.x | 8.5(1)su4 8.6(2a)su1 8.6(4) (BE3K-only release) |
8.5(1)su4 8.6(2a)su2 8.6(4) (BE3K-only release) |
9.x | Not affected |
Not affected |
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
This vulnerability was found during troubleshooting of TAC service requests.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Revision 1.0 | 2012-September-26 | Initial public release. |
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