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Vigil@nce: Linux kernel, denial of service of SCTP

October 2008 by Vigil@nce

A local attacker can stop the system via SCTP-AUTH.

 Gravity: 1/4
 Consequences: denial of service of computer
 Provenance: user shell
 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: 08/10/2008

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION

The SCTP protocol (Stream Control Transmission Protocol) creates
associations to send several streams. The draft-ietf-tsvwg-sctp-auth-08
draft defines the AUTH extension containing HMAC authentication
data.

The CVE-2008-3792 vulnerability of the VIGILANCE-VUL-8104
(https://vigilance.aql.fr/tree/1/8104) sheet was not fully
corrected. A SCTP-AUTH INIT-ACK packet forces the usage of an
invalid pointer, which stops the system.

An attacker can therefore create a denial of service on computers
with SCTP enabled, but SCTP-AUTH inactive.

CHARACTERISTICS

 Identifiers: VIGILANCE-VUL-8154
 Url: http://vigilance.aql.fr/vulnerability/8154


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