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Vigil@nce: Linux kernel, memory corruption via HFS

November 2008 by Vigil@nce

SYNTHESIS

A local attacker can mount a malicious HFS image in order to create a denial of service or to execute code.

Gravity: 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: medium (2/3)

Creation date: 14/11/2008

IMPACTED PRODUCTS

- Linux kernel

DESCRIPTION

The HFS filesystem is mainly used on Mac OS.

The hfs_cat_find_brec() function of fs/hfs/catalog.c file searches a record in a HFS catalog. However, if the size of the record name is longer than HFS_NAMELEN, a buffer overflow occurs in memcpy().

A local attacker, allowed to mount a HFS filesystem, can therefore mount a malicious HFS image in order to create a denial of service or to execute code.

CHARACTERISTICS

Identifiers: BID-32289, CVE-2008-5025, VIGILANCE-VUL-8246

http://vigilance.fr/vulnerability/8246




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