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Vulnerability of Microsoft Forefront TMG 2010 Client: code execution

Synthesis of the vulnerability 

An attacker can invite the victim to send malicious queries via Microsoft Forefront Threat Management Gateway 2010 Client, in order to execute code on his computer.
Vulnerable products: Forefront Threat Management Gateway.
Severity of this weakness: 4/4.
Creation date: 15/06/2011.
Références of this bulletin: 2520426, BID-48181, CERTA-2011-AVI-348, CVE-2011-1889, MS11-040, VIGILANCE-VUL-10734.

Description of the vulnerability 

The Microsoft Forefront Threat Management Gateway 2010 Client product can be installed on users' computers, and communicates with the firewall Microsoft Forefront Threat Management Gateway 2010 in order to filter queries before they are sent on the network.

The NSPLookupServiceBegin() and NSPLookupServiceNext() methods are used for WinSock resolution queries. They are used by Microsoft Forefront TMG 2010 Client. However, the NSPLookupServiceNext() method does not correctly validate the query, so an overflow occurs.

An attacker can therefore invite the victim to send malicious queries via Microsoft Forefront Threat Management Gateway 2010 Client, in order to execute code on his computer.
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This threat alert impacts software or systems such as Forefront Threat Management Gateway.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is critical.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this weakness note.

Solutions for this threat 

Microsoft Forefront TMG 2010 Client: patch.
A patch is available:
Microsoft Forefront Threat Management Gateway 2010 Client
  http://www.microsoft.com/downloads/details.aspx?FamilyID=d1c85acd-a6df-4634-9cd4-c562ad92097e
The Microsoft announce indicates workarounds.
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