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SYNTHESIS OF THE VULNERABILITY

A local attacker can map a file in memory in order to create a
denial of service and eventually to execute code.

Gravity: 2/4

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: high (3/3)

Creation date: 13/01/2009

IMPACTED PRODUCTS

– Linux kernel

DESCRIPTION OF THE VULNERABILITY

The sys_remap_file_pages() function of mm/fremap.c is called when
a file is mapped in memory.

The get_file() and fput() macros/functions atomically
increment/decrement the number of users of a file. The
sys_remap_file_pages() does not use them.

A local attacker can therefore use a mapped file in order to
corrupt the memory, which leads to a denial of service or to code
execution.

CHARACTERISTICS

Identifiers: BID-33211, CVE-2009-0024, VIGILANCE-VUL-8384

http://vigilance.fr/vulnerability/Linux-kernel-privilege-elevation-via-sys-remap-file-pages-8384