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Vigil@nce: Linux kernel, privilege elevation via perf_counter_open

September 2009 by Vigil@nce

A local attacker can generate a buffer overflow in
perf_counter_open() in order to obtain system privileges.

 Severity: 2/4
 Consequences: administrator access/rights
 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: 16/09/2009

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The Linux kernel version 2.6.31 provides the perf_counter_open()
system call, to obtain statistics.

Parameters of perf_counter_open() are transmitted to
perf_copy_attr(), which does not check if the size to copy is
superior to the size of attributes. An overflow this occurs.

A local attacker can therefore generate a buffer overflow in
perf_counter_open() in order to obtain system privileges.

CHARACTERISTICS

 Identifiers: BID-36423, CVE-2009-3234, VIGILANCE-VUL-9027
 Url: http://vigilance.fr/vulnerability/Linux-kernel-privilege-elevation-via-perf-counter-open-9027


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