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Microsoft Windows Win32k.sys Malformed IFrame Memory Corruption (MS12-008; CVE-2011-5046)


Check Point Reference: CPAI-2012-013
Date Published:
Source: Microsoft Security Bulletin: MS12-008
Secunia Advisory: 47237
Industry Reference(s): CVE-2011-5046
Protection Provided by: Security Gateway
  • R75
  • R71
  • R70
Who is Vulnerable?
Windows 7 for x64-based Systems
Vulnerability Description
A memory corruption vulnerability has been reported in Microsoft Windows.
Update/Patch Available
Apply updates from: MS12-008
Vulnerability Details
The vulnerability is due to an error in win32k.sys while opening web pages containing a specially crafted IFrame tag. A remote attacker may exploit this issue by enticing users to open a web page containing an IFrame with an overly large "height" attribute. Successful exploitation may allow an attacker to execute arbitrary code on the target system with kernel-mode privileges.

Protection Overview
This protection will detect and block attempts to open specially crafted web pages.

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 Windows Win32k.sys Malformed IFrame Memory Corruption (MS12-008) 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: Web Client Enforcement Violation
Attack Information: Microsoft Windows win32k.sys malformed IFrame memory corruption  (MS12-008)