Check Point Advisories

Microsoft Remote Desktop Client Insecure Library Loading (MS11-017; CVE-2011-0029)

Check Point Reference: CPAI-2011-052
Date Published: 8 Mar 2011
Severity: Critical
Last Updated: Wednesday 24 December, 2014
Source:
Industry Reference:CVE-2011-0029
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description The Remote Desktop feature in Windows enables access to all of the programs, resources, and accessories on a user's computer from another Windows-based computer. Once connected, Remote Desktop gives mouse and keyboard control over the computer while showing everything that is happening on the screen. A remote code execution vulnerability has been reported in the way that the Windows Remote Desktop Client handles the loading of DLL files. The vulnerability is caused when the Windows Remote Desktop Client incorrectly restricts the path used for loading external libraries. An attacker could convince a user to open a legitimate Remote Desktop configuration file (.rdp) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the .rdp file, Windows Remote Desktop Client could attempt to load the DLL file and execute any code it contained. 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 and WebDav.

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 Remote Desktop Client Insecure Library Loading (MS11-017) 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 Remote Desktop Client insecure library loading (MS11-017)

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