Check Point Advisories

Microsoft Windows Messenger msgsc.dll ActiveX Control Corruption (MS11-027; CVE-2011-1243)

Check Point Reference: CPAI-2011-229
Date Published: 10 Apr 2011
Severity: Critical
Last Updated: Sunday 10 April, 2011
Source:
Industry Reference:CVE-2011-1243
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description Windows Messenger is an instant messaging client by Microsoft. A remote code execution vulnerability has been reported in the Microsoft Windows Messenger ActiveX Control. The vulnerability is caused when the ActiveX control is used in Internet Explorer, the control may corrupt the system state. To trigger this issue, an attacker may create a malicious web page that will exploit this flaw. Successful exploitation of this vulnerability may allow execution of arbitrary code on the vulnerable system.

Protection Overview

This protection will detect and block the vulnerable ActiveX control.

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 Messenger msgsc.dll ActiveX Control Corruption (MS11-027) 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:  Web Client Enforcement Violation.
Attack Information:  Microsoft Windows Messenger msgsc.dll ActiveX control corruption (MS11-027)

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