Cisco Unified Communications Manager contains a memory leak vulnerability that could be triggered through the processing of malformed Session Initiation Protocol (SIP) messages. Exploitation of this vulnerability could cause an interruption of voice services. Cisco has released free software updates for supported Cisco Unified Communications Manager versions to address the vulnerability. A workaround exists for this SIP vulnerability.
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-cucm["http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-cucm"].
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:
Cisco IOS Software is affected by the SIP vulnerability described in this advisory. A separate Cisco Security Advisory has been published to disclose the vulnerabilities that affect the Cisco IOS software at the following location: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-sip["http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110928-sip"].