Vigil@nce: Cisco FWSM, denial of service of SCCP
February 2010 by Vigil@nce
SYNTHESIS OF THE VULNERABILITY
An attacker can use SCCP (Skinny Call Control Protocol) control messages, in order to generate a denial of service.
Consequences: denial of service of service
Provenance: intranet client
Means of attack: no proof of concept, no attack
Ability of attacker: expert (4/4)
Confidence: confirmed by the editor (5/5)
Diffusion of the vulnerable configuration: high (3/3)
Creation date: 17/02/2010
DESCRIPTION OF THE VULNERABILITY
The SCCP (Skinny Call Control Protocol) protocol is used by Cisco
VoIP phones, to communicate with the CallManager. A packet is
4 bytes indicating the size
4 null bytes
4 bytes for the message type
When a malformed SCCP packet transits by Cisco FWSM, it reloads.
An attacker can therefore use SCCP control messages, in order to generate a denial of service.
This vulnerability also impacts Cisco ASA (described in the bulletin VIGILANCE-VUL-9458).
Identifiers: 111553, BID-38274, cisco-sa-20100217-fwsm, CSCtb60485, CVE-2010-0151, VIGILANCE-VUL-9459 Pointed by: VIGILANCE-VUL-9458