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IPS Signatures

Malformed SIP Packet Denial of Service

 
Signature ID: 25999/0
Original Release:S490
Release:S598 (download)
Original Release Date:2010 May 13
Latest Release Date:2011 September 28
Default Enabled:True
Default Retired:False
Alarm Severity:High
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, Cisco IOS 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 PGW softswitch is documented in Cisco Bug ID CSCsj98521 and has been assigned the CVE identifier CVE-2010-1562.The Vulnerability in Cisco IOS is documented in Cisco Bug ID CSCti48483 and has been assigned the CVE identifier CVE-2011-3278.

Recommended Filter
There are no suggested filters.

Benign Triggers
The potential for false positives exists, as such, This signature should only be used if running a vulnerable version of PGW softswitch. In addition, alerts should be filtered to exclude everything except the destination IP addresses of those vulnerable servers.

IntelliShield Alerts
IntelliShield ID Headline VersionCVSS ScoreLast Published
20451Cisco PGW 2200 Softswitch SIP Contact Header Processing Denial of Service Vulnerability17.8/6.42010 May 12 16:33 GMT
24120Cisco IOS Software Session Initiation Protocol UDP Packet Network Address Translation Denial of Service Vulnerability12011 September 28 17:12 GMT

Download
To download this and other IPS update files, please go to Cisco Secure Software Download.
LEGAL DISCLAIMER
THE INFORMATION ON THIS PAGE 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 CONTAINED HEREIN, OR MATERIALS LINKED FROM THE DOCUMENT, IS AT YOUR OWN RISK. INFORMATION IN THIS DOCUMENT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
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