Check Point Advisories

Microsoft Windows BranchCache Insecure Library Loading (MS10-095; CVE-2010-3966)

Check Point Reference: CPAI-2010-342
Date Published: 14 Dec 2010
Severity: Critical
Last Updated: Tuesday 14 December, 2010
Source:
Industry Reference:CVE-2010-3966
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description BranchCache is a wide area network (WAN) bandwidth optimization technology that is included in some editions of the Windows Server 2008 R2 and Windows 7 operating systems. To optimize WAN bandwidth, BranchCache copies content from your main office content servers and caches the content at branch office locations, allowing client computers at branch offices to access the content locally rather than over the WAN. A remote code execution vulnerability has been reported in the way that Microsoft Windows deals with the opening of specific files on platforms which do not support the BranchCache functionality. The vulnerability is caused by Windows attempting to validate whether a specific DLL used by Windows BranchCache exists on the system. A specially crafted file placed in an alternate location could cause Windows to execute the code it contains. Successful exploitation of this vulnerability could allow the attacker to take complete control of an affected system.

Protection Overview

This protection will detect and block the transferring of suspicious DLL files over CIFS.

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, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75 / R71 / R70 / R65

  1. In the IPS tab, click Protections and find the Microsoft Windows BranchCache Insecure Library Loading (MS10-095) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Windows SMB Protection Violation.
Attack Information:  Microsoft Windows BranchCache insecure library loading (MS10-095)

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