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Microsoft Security Bulletin MS13-041 - Important

Vulnerability in Lync Could Allow Remote Code Execution (2834695)


Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Lync. The vulnerability could allow remote code execution if an attacker shares specially crafted content, such as a file or program, as a presentation in Lync or Communicator and then convinces a user to accept an invitation to view or share the presentable content. In all cases, an attacker would have no way to force users to view or share the attacker-controlled file or program. Instead, an attacker would have to convince users to take action, typically by getting them to accept an invitation in Lync or Communicator to view or share the presentable content.

This security update is rated Important for supported editions of Microsoft Communicator 2007 R2, Microsoft Lync 2010, Microsoft Lync 2010 Attendee, and Microsoft Lync Server 2013. 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 Lync and Communicator clients handle objects in memory. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection 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 at the earliest opportunity 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.

Knowledge Base Article

Knowledge Base Article2834695
File informationYes
SHA1/SHA2 hashesYes
Known issuesYes

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, see Microsoft Support Lifecycle.

Affected Software

Microsoft Communications Platforms and Software 

SoftwareMaximum Security ImpactAggregate Severity RatingUpdates Replaced
Microsoft Communicator 2007 R2
Remote Code ExecutionImportant2726391 in MS12-066
Microsoft Lync 2010 (32-bit)
Remote Code ExecutionImportant2726382 in MS12-066
Microsoft Lync 2010 (64-bit)
Remote Code ExecutionImportant2726382 in MS12-066
Microsoft Lync 2010 Attendee
(admin level install)
Remote Code ExecutionImportant2726388 in MS12-066
Microsoft Lync 2010 Attendee[1]
(user level install)
Remote Code ExecutionImportant2726384 in MS12-066
Microsoft Lync Server 2013[2]
(Web Components Server)
Remote Code ExecutionImportantNone

[1]This update is available from the Microsoft Download Center only. See the Update FAQ section for more information.

[2]Applying the Lync Server 2013 security update (2827754) also installs the February 2013 cumulative updates for Lync Server 2013.

Non-Affected Software 

Office and Other Software
Microsoft Communicator 2005
Microsoft Communicator 2005 Web Access
Microsoft Communicator 2007
Microsoft Communicator 2007 Web Access
Microsoft Communications Server 2007
Microsoft Communications Server 2007 Speech Server
Microsoft Communications Server 2007 R2
Microsoft Communicator 2007 R2 Attendant
Microsoft Communicator 2007 R2 Group Chat Admin
Microsoft Communicator 2007 R2 Group Chat Client
Microsoft Live Meeting 2007 Console
Microsoft Communicator for Mac 2011
Microsoft Communicator Mobile
Microsoft Communicator Phone Edition
Microsoft Lync Server 2010
Microsoft Lync 2010 Attendant (32-bit)
Microsoft Lync 2010 Attendant (64-bit)
Microsoft Lync 2010 Group Chat
Microsoft Lync Server 2010 Group Chat Software Development Kit
Microsoft Lync for Mac 2011
Microsoft Lync 2013 (32-bit)
Microsoft Lync 2013 (64-bit)

Update FAQ

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Lync RCE Vulnerability - CVE-2013-1302

Update Information

Detection and Deployment Tools and Guidance

Security Update Deployment

Other Information

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please go to the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.


How to obtain help and support for this security update


The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.


  • V1.0 (May 14, 2013): Bulletin published.