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Vigil@nce: Windows Message Queuing, privilege elevation

August 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

A local attacker can use an IOCTL on MSMQ 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: 12/08/2009

IMPACTED PRODUCTS

 Microsoft Windows 2000
 Microsoft Windows 2003
 Microsoft Windows Vista
 Microsoft Windows XP

DESCRIPTION OF THE VULNERABILITY

The Message Queuing (MSMQ) service handles messages of a
distributed application. It is disabled by default.

A user can interact with this service by using an IOCTL on
mqac.sys. However, the service does not correctly validate
parameters of the IOCTL, which leads to a memory corruption.

A local attacker can therefore use an IOCTL on MSMQ in order to
obtain system privileges.

CHARACTERISTICS

Identifiers: 971032, BID-35969, CVE-2009-1922, MS09-040,
PT-2008-09, VIGILANCE-VUL-8940

http://vigilance.fr/vulnerability/Windows-Message-Queuing-privilege-elevation-8940


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