Products & Services

Document ID: 592

http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070821-sip

Revision 1.1

For Public Release 2007 August 21 22:00  UTC (GMT)

Contents

Cisco Response

This is the Cisco PSIRT response to an issue discovered and reported to Cisco by Radu State, Humberto J. Abdelnur and Olivier Festor regarding two Session Initiation Protocol (SIP) vulnerabilities in the Cisco 7940/7960 IP Phones.

The original reports are available at the following links:

http://archives.neohapsis.com/archives/fulldisclosure/2007-08/0385.html

http://archives.neohapsis.com/archives/fulldisclosure/2007-08/0386.html

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

Cisco has confirmed the following: This issue is documented as Cisco bug ID CSCsi68191 (registered customers only) . Cisco IP Phone 7940/7960 SIP firmware versions prior to 8.7(0) are vulnerable to the denial of service attacks detailed in the reports. Firmware versions 8.7(0) and later are not vulnerable to this issue. Version 8.7(0) firmware images for Cisco IP 7940/7960 phones can be obtained here:

http://www.cisco.com/pcgi-bin/tablebuild.pl/sip-ip-phone7960?psrtdcat20e2 (registered customers only)

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.