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Vulnerability of Cisco 7600: denial of service via SBC

Synthesis of the vulnerability 

An attacker can send a malicious packet in order to stop the Session Border Controller module on the Cisco 7600 router.
Vulnerable products: IOS by Cisco, Cisco Router.
Severity of this weakness: 2/4.
Creation date: 04/03/2009.
Références of this bulletin: 109483, 109611, BID-33975, BID-34003, CERTA-2009-AVI-087, cisco-sa-20090304-sbc, CSCsq18958, CVE-2009-0619, VIGILANCE-VUL-8508.

Description of the vulnerability 

The SBC (Cisco Session Border Controller) module can be installed on a Cisco 7600 router to establish interconnections, for VoIP. This module listens on the port 2000/tcp.

However, when this module receives malformed data, it stops (but the router is not stopped).

An attacker can therefore send a malicious TCP packet in order to stop the Session Border Controller module on the Cisco 7600 router.
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This weakness impacts software or systems such as IOS by Cisco, Cisco Router.

Our Vigil@nce team determined that the severity of this vulnerability announce is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this threat bulletin.

Solutions for this threat 

Cisco 7600: SBC version 3.0(2).
SBC version 3.0(2) is corrected:
  http://www.cisco.com/pcgi-bin/tablebuild.pl/sbc-7600-crypto
The announce indicates workarounds.
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