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SYNTHESIS OF THE VULNERABILITY

An authenticated attacker can generate a double memory free in
Workstation Service in order to elevate his 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 2003
– Microsoft Windows 2008
– Microsoft Windows Vista
– Microsoft Windows XP

DESCRIPTION OF THE VULNERABILITY

The Workstation Service is enabled by default, and provides access
to shared resources.

An authenticated attacker can send a malicious RPC
NetrGetJoinInformation message to the service, in order to force
it to free a memory area twice. This error corrupts the memory,
and leads to code execution with system privileges.

A local attacker can thus elevate his privileges.

CHARACTERISTICS

Identifiers: 971657, BID-35972, CVE-2009-1544, MS09-041,
TPTI-09-06, VIGILANCE-VUL-8941

http://vigilance.fr/vulnerability/Windows-code-execution-via-Workstation-Service-8941