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Vigil@nce - Linux kernel: privilege elevation via perf

August 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local attacker can invite the administrator to execute the perf
command provided with the Linux kernel, in a directory where he
stored a malicious configuration file, in order to elevate his
privileges.

Severity: 1/4

Creation date: 18/08/2011

IMPACTED PRODUCTS
- Fedora
- Linux kernel

DESCRIPTION OF THE VULNERABILITY

The source code of the Linux kernel is provided with the perf
tool, which can be used to analyze performances of the system.

The perf tool reads a file configuration which can contain the
following directives:
 color.ui : customized color
 man.viewer : program to display help
 pager.* : program to display page per page
 etc.

This configuration file can be located at several places:
 /etc/perfconfig
 $HOME/.perfconfig
 ./config

The perf command thus accepts "config" files located in the
current directory.

A local attacker can therefore invite the administrator to execute
the perf command provided with the Linux kernel, in a directory
where he stored a malicious configuration file, in order to
elevate his privileges.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-privilege-elevation-via-perf-10932


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