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Vigil@nce: Linux kernel, NULL dereference in md

August 2009 by Vigil@nce

A local attacker can generate a NULL pointer dereference in the
suspend_lo_store()/suspend_hi_store() function of the kernel, in
order to generate a denial of service or to execute code.

Severity: 1/4

Consequences: administrator access/rights, 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: low (1/3)

Creation date: 25/08/2009

IMPACTED PRODUCTS

 Debian Linux
 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The md driver implements the support of disks configured as RAID.

The suspend_lo_store() and suspend_hi_store() functions of the
drivers/md/md.c file are reachable via files
/sys/block/mdX/md/suspend_lo and suspend_hi. By default, the sysfs
filesystem is mounted with mode 0644, so it is not writable by
local users. However, when the sysfs mode allows users to modify
suspend_lo and suspend_hi, they can force the md driver to
dereference a NULL pointer.

This vulnerability therefore leads to a denial of service.

A local attacker can also use this vulnerability with
VIGILANCE-VUL-8953 (https://vigilance.fr/tree/1/8953)/VIGILANCE-VUL-8861
(https://vigilance.fr/tree/1/8861) in order to elevate his
privileges.

CHARACTERISTICS

Identifiers: CVE-2009-2849, DSA 1872-1, VIGILANCE-VUL-8973

http://vigilance.fr/vulnerability/Linux-kernel-NULL-dereference-in-md-8973


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