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Vigil@nce - Sophos AV: privilege elevation via SAVOnAccessFilter

June 2010 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use a vulnerability of the SAVOnAccessFilter driver, in order to obtain system privileges.

Severity: 2/4

Creation date: 10/06/2010

DESCRIPTION OF THE VULNERABILITY

The Sophos antivirus installs the SAVOnAccessFilter.sys driver, which checks system calls when they are used.

The NtQueryAttributesFile() system call retrieves information on a file. The SAVOnAccessFilter.sys driver checks this system call.

However, parameters of NtQueryAttributesFile() are not correctly filtered by the driver, which corrupts its memory.

A local attacker can therefore use a vulnerability of the SAVOnAccessFilter driver, in order to obtain system privileges.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/S...




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