U radu paketa Forefront Threat Management Gateway Firewall Client uočen je sigurnosni propust koji zlonamjernim korisnicima omogućuje pokretanje proizvoljnog programskog koda.

Microsoft Security Bulletin MS11-040 - Critical
Vulnerability in Threat Management Gateway Firewall Client Could Allow Remote Code Execution (2520426)
Published: June 14, 2011

Version: 1.0
General Information
Executive Summary

This security update resolves a privately reported vulnerability in the Microsoft Forefront Threat Management Gateway (TMG) 2010 Client, formerly named the Microsoft Forefront Threat Management Gateway Firewall Client. The vulnerability could allow remote code execution if an attacker leveraged a client computer to make specific requests on a system where the TMG firewall client is used.

This security update is rated Critical for Microsoft Forefront Threat Management Gateway 2010 Client. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by setting proper bounds to the NSPLookupServiceNext function. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates from Microsoft Update and install this update manually. For information about specific configuration options in automatic updating in supported editions of Windows XP and Windows Server 2003, see Microsoft Knowledge Base Article 294871. For information about automatic updating in supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, see Understanding Windows automatic updating.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update immediately using update management software, or by checking for updates using the Microsoft Update service.

Known Issues. None
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Affected and Non-Affected Software

The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.

Affected Software 
Software	Maximum Security Impact	Aggregate Severity Rating	Bulletins Replaced by this Update

Microsoft Forefront Threat Management Gateway 2010 Client
	

Remote Code Execution
	

Critical
	

None

Non-Affected Software
Software

Microsoft Internet Security and Acceleration Server 2004

Microsoft Internet Security and Acceleration Server 2006

Microsoft Forefront Threat Management Gateway, Medium Business Edition
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Frequently Asked Questions (FAQ) Related to This Security Update

Where are the file information details? 
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.

I am using an older release of the software discussed in this security bulletin. What should I do? 
The affected software listed in this bulletin have been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, visit the Microsoft Support Lifecycle Web site.

It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Lifecycle Supported Service Packs.

Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, visit the Microsoft Worldwide Information Web site, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.
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Vulnerability Information
	
Severity Ratings and Vulnerability Identifiers

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the June bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software	TMG Firewall Client Memory Corruption Vulnerability - CVE-2011-1889 	Aggregate Severity Rating

Microsoft Forefront Threat Management Gateway 2010 Client
	

Critical
Remote Code Execution
	

Critical
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TMG Firewall Client Memory Corruption Vulnerability - CVE-2011-1889

A remote code execution vulnerability exists in the TMG Firewall Client Winsock provider that could allow code execution in the security context of the client application.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1889.
	
Mitigating Factors for TMG Firewall Client Memory Corruption Vulnerability - CVE-2011-1889

Microsoft has not identified any mitigating factors for this vulnerability.
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Workarounds for TMG Firewall Client Memory Corruption Vulnerability - CVE-2011-1889

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
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