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Microsoft Security Bulletin MS11-053 - Critical
Vulnerability in Bluetooth Stack Could Allow Remote Code Execution (2566220)
Published: July 12, 2011

Version: 1.0
General Information
Executive Summary

This security update resolves a privately reported vulnerability in the Windows Bluetooth Stack. The vulnerability could allow remote code execution if an attacker sent a series of specially crafted Bluetooth packets to an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. This vulnerability only affects systems with Bluetooth capability.

This security update is rated Critical for all supported editions of Windows Vista and Windows 7. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by modifying the way that the Windows Bluetooth Stack handles objects in memory. 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. The majority of customers have automatic updating enabled and 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 and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

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.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. Microsoft Knowledge Base Article 2566220 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues.
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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
Operating System	Maximum Security Impact	Aggregate Severity Rating	Bulletins Replaced by this Update

Windows Vista Service Pack 1[1]
(KB2561109)
	

Remote Code Execution
	

Critical
	

None

Windows Vista Service Pack 2
(KB2532531)
	

Remote Code Execution
	

Critical
	

None

Windows Vista x64 Edition Service Pack 1[1]
(KB2561109)
	

Remote Code Execution
	

Critical
	

None

Windows Vista x64 Edition Service Pack 2
(KB2532531)
	

Remote Code Execution
	

Critical
	

None

Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
(KB2532531)
	

Remote Code Execution
	

Critical
	

None

Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
(KB2532531)
	

Remote Code Execution
	

Critical
	

None

[1]Windows Vista Service Pack 1 is only affected when the optional Windows Vista Feature Pack for Wireless has been installed. See the update FAQ for details.

Non-Affected Software
Operating System

Windows XP Service Pack 3

Windows XP Professional x64 Edition Service Pack 2

Windows Server 2003 Service Pack 2

Windows Server 2003 x64 Edition Service Pack 2

Windows Server 2003 with SP2 for Itanium-based Systems

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1

Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
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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 running Windows Vista Service Pack 1. Is my system affected by this vulnerability? 
Windows Vista Service Pack 1 is only affected on systems with support for Bluetooth 2.1 technology. Windows Vista Service Pack 1 customers who have installed the Windows Vista Feature Pack for Wireless will have support for Bluetooth 2.1 technology and will therefore be affected by this vulnerability. These customers will need to install security update KB2561109. Customers who have not installed the Windows Vista Feature Pack for Wireless will not have support for Bluetooth 2.1 and will therefore not be affected by this vulnerability. For more information, see Microsoft Knowledge Base Article 2566220.

I have installed the Windows Vista Feature Pack for Wireless for Windows Vista Service Pack 1, but have upgraded to Windows Vista Service Pack 2. Which updates do I need to install? 
Windows Vista Service Pack 1 customers who have enabled the Windows Vista Feature Pack for Wireless for Windows Vista Service Pack 1 and who have successfully upgraded to Windows Vista Service Pack 2 will need to install security update KB2532531. For more information, see Microsoft Knowledge Base Article 2566220.

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 July bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software	Bluetooth Stack Vulnerability - CVE-2011-1265	Aggregate Severity Rating

Windows Vista Service Pack 1 and Windows Vista Service Pack 2
	

Critical 
Remote Code Execution
	

Critical

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
	

Critical 
Remote Code Execution
	

Critical

Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
	

Critical 
Remote Code Execution
	

Critical

Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
	

Critical 
Remote Code Execution
	

Critical
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Bluetooth Stack Vulnerability - CVE-2011-1265

A remote code execution vulnerability exists in the Windows Bluetooth 2.1 Stack due to the way an object in memory is accessed when it has not been correctly initialized or has been deleted. An attacker could exploit the vulnerability by constructing a series of specially crafted Bluetooth packets and sending them to the target machine. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1265.
	
Mitigating Factors for Bluetooth Stack Vulnerability - CVE-2011-1265

Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
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