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 Gravity: 1/4
 Consequences: data reading, 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: 11/09/2008
 Identifier: VIGILANCE-VUL-8104

IMPACTED PRODUCTS

 Debian Linux [confidential versions]
 Linux kernel [confidential versions]

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.

However, the SCTP-AUTH implementation (enabled with net.sctp.auth_enable) of Linux kernel is incorrect:
 if it is enabled, an attacker can use the SCTP_HMAC_IDENT ioctl to read a memory fragment
 if it is disabled, its usage dereferences a NULL pointer, which stops the system

A local attacker can therefore read the kernel memory or stop the system via SCTP-AUTH.

CHARACTERISTICS

 Identifiers: CVE-2008-3792, DSA 1636-1, TKADV2008-007, VIGILANCE-VUL-8104
 Url: https://vigilance.aql.fr/tree/1/8104