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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.

Severity: 2/4

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

IMPACTED PRODUCTS

- Cisco Catalyst
- Cisco Router

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 composed of:
- 4 bytes indicating the size
- 4 null bytes
- 4 bytes for the message type
- message

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).

CHARACTERISTICS

Identifiers: 111553, BID-38274, cisco-sa-20100217-fwsm, CSCtb60485, CVE-2010-0151, VIGILANCE-VUL-9459 Pointed by: VIGILANCE-VUL-9458

http://vigilance.fr/vulnerability/C...




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