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Cisco Security

Malformed SIP Message

 
Signature ID: 20481/1
Original Release:S427
Release:S593 (download)
Original Release Date:2009 August 26
Latest Release Date:2011 September 07
Default Enabled:False
Default Retired:True
Alarm Severity:Medium
Fidelity:85 

Description

This signature triggers on an attempt to exploit a Session Initiation Protocol (SIP) packet processing vulnerability in certain versions of the Cisco Unified Communications Manager and Cisco PGW softswitch. Successful exploitation of the vulnerability can result in a denial of service condition that may interrupt voice services. This signature recognizes the attempt over UDP.The Vulnerability in Cisco Unified Communications Manager is documented in Cisco Bug ID CSCsz40392. This vulnerability has been assigned the CVE identifier CVE-2009-2051. The Vulnerability in Cisco PGW softswitch is documented in Cisco Bug ID CSCsk38165. This vulnerability has been assigned the CVE identifier CVE-2010-0604. The potential for false positives exists, as such, this signature ships disabled by default and should only be used if running a vulnerable version of CUCM. In addition, alerts should be filtered to exclude everything except the destination IP addresses of those vulnerable servers.

Recommended Filter

Alerts should be filtered to exclude everything except the destination IP addresses of CUCM servers running a vulnerable version of code.

Benign Triggers

This signature may trigger on legitimate traffic.

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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