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.
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
Debian Linux [confidential versions]
Linux kernel [confidential versions]
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.
Identifiers: CVE-2008-3792, DSA 1636-1, TKADV2008-007,