Vigil@nce: Linux kernel, denial of service of SCTP-AUTH
September 2008 by Vigil@nce
A local attacker can read the kernel memory or stop the system via
SCTP-AUTH.
– 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