Cisco Security Response

Document ID: 640

http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070320-sip

Revision 1.3

For Public Release 2007 March 20 22:30  UTC (GMT)

Contents

Cisco Response

This is the Cisco PSIRT response to an issue disclosed by Mr Radu State on a message sent to the Full-disclosure mailing list on March 20, 2007 with a subject of "CISCO Phone 7940 DOS vulnerability". The original message is available at http://lists.grok.org.uk/pipermail/full-disclosure/2007-March/053063.html.

Cisco has confirmed the findings of the statements made. Cisco IP Phone 7940/7960 SIP firmware version 7.4(0) is vulnerable to the denial of service. Firmware version 8.6(0) is not vulnerable to this issue. The latest firmware images for Cisco IP 7940/7960 phones can be obtained here:

http://www.cisco.com/pcgi-bin/tablebuild.pl/sip-ip-phone7960?psrtdcat20e2

We would like to thank Radu State, Humberto J. Abdelnur and Olivier Festor of the Madynes research team at INRIA for reporting these issues to Cisco Systems.

We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist in product reports.

Additional Information

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.

Revision History

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/en/US/products/products_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.