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AUSCERT External Security Bulletin Redistribution
ESB-2007.0636 -- [Cisco]
Multiple SIP Vulnerabilities in the Cisco 7940/7960 IP Phones
22 August 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IP Phone 7940/7960
Publisher: Cisco Systems
Operating System: SIP firmware versions prior to 8.7(0)
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://www.cisco.com/warp/public/707/cisco-sr-20070821-sip.shtml
Comment: Exploit code is publicly available for these vulnerabilities.
Administrators in charge of vulnerable devices which need to exist
in a publicly accessible network should consider upgrading the
firmware to 8.7(0) as soon as possible.
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Cisco Security Response: Multiple SIP Vulnerabilities in the Cisco
7960 IP Phones
Document ID: 98592
http://www.cisco.com/warp/public/707/cisco-sr-20070821-sip.shtml
Revision 1.0
For Public Release 2007 August 21 2200 UTC (GMT)
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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 confirmes the following: This issue is documented as Cisco
bug ID CSCsi68191. 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
Additional Information
======================
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.
Revision History
================
+---------------------------------------+
| Revision | | Initial |
| 1.0 | 2007-August-21 | public |
| | | release |
+---------------------------------------+
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.
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