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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




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