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TUCoPS :: Cisco :: va2299.htm

Cisco Unified IP Phone 7960G and 7940G (SIP) RTP Header Vulnerability



Cisco Unified IP Phone 7960G and 7940G (SIP) RTP Header Vulnerability
Cisco Unified IP Phone 7960G and 7940G (SIP) RTP Header Vulnerability



Title:
------
* Cisco Unified IP Phone 7960G and 7940G (SIP) RTP Header Vulnerability

Summary:
--------
* The Cisco Unified IP Phone 7960G and 7940G (SIP) do not correctly
parse some malformed RTP headers leading to a deterministic denial of
service

Assigned CVE:
-------------
* CVE-2008-4444

Details:
--------
* SIP protocol is used to set up calls between phones. Once the call is
established, the media content is carried by the RTP protocol. A remote
attacker could send a specially crafted RTP packet against a Cisco SIP
phone in such a way as to cause the phone to reboot.

Attack Impact:
--------------
* Denial-of-service (reboot or hang-up) and possibly remote arbitrary
code execution

Attack Vector:
--------------
* Have the possibility to setup a call to the targeted phone and carry
RTP frame to the vulnerable device
* Have access to the VoIP network while a call is established and inject
RTP frames

Timeline:
---------
* 2008-06-13 - Vulnerability reported to Cisco
* 2008-06-16 - Full details sent to Cisco
* 2008-10-21 - Cisco released a patched firmware
* 2009-01-14 - Release of this security advisory

Affected Products:
------------------
* Cisco Unified IP Phone 7960G and 7940G (SIP) with P0S3-08-9-00
firmware. Cisco released a patched firmware on October 21, 2008 which is
described in the bug identifier CSCsu22285 (Cisco Unified IP Phone 7960G
and 7940G (SIP) Release Notes for Firmware Release 8.10).

Credits:
--------
* This vulnerability was discovered by Gabriel Campana and Laurent Butti
from France Telecom / Orange


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