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Microsoft Lync Insecure Library Loading Code Execution (MS12-039; CVE-2012-1849)


Check Point Reference: CPAI-2012-254
Date Published:
Source: Microsoft Security Bulletin MS12-039
Industry Reference(s): CVE-2012-1849
Protection Provided by: Security Gateway
  • R70
  • R71
  • R75
Who is Vulnerable?
Microsoft Lync 2010
Microsoft Lync 2010 Attendee
Microsoft Lync 2010 Attendant (32-bit)
Microsoft Lync 2010 Attendant (64-bit)
Vulnerability Description
A remote code execution vulnerability has been reported in Microsoft Lync.
Update/Patch Available
Apply patches from: MS12-039
Vulnerability Details
The vulnerability is due to an error in the way Microsoft Lync restricts the path used for loading external libraries. A remote attacker could exploit this issue by enticing a user to open a legitimate Lync file (such as an .ocsmeet file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Successful exploitation will allow an attacker to execute arbitrary code on an affected system, in the security context of the logged on user.

Protection Overview
This protection will detect and block the transferring of malicious DLL files over a network share.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75 / R71 / R70

How Can I Protect My Network?

  1. In the IPS tab, click Protections and find the Microsoft Lync Insecure Library Loading Code Execution (MS12-039) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:
Attack Name: Windows SMB Protection Violation
Attack Information: Microsoft Lync Insecure Library Loading Code Execution (MS12-039)