Check Point Advisories

Microsoft Windows Kernel win32k.sys Execute NULL Code Execution (MS11-034; CVE-2011-1231)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-218
Date Published:	3 Apr 2011
Severity:	High
Last Updated:	Sunday 03 April, 2011
Source:
Industry Reference:	CVE-2011-1231
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling. An elevation of privilege vulnerability has been reported in the Windows kernel. The vulnerability is caused by a Null pointer dereference due to the way kernel-mode drivers keep track of pointers to certain kernel-mode driver objects. The win32k!xxxExecute does not check a structure member for NULL; this member is automatically set to NULL when a window object is destroyed in usermode. An attacker could run a specially crafted application that could exploit this flaw and take complete control over the affected system.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

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

In the IPS tab, click Protections and find the Microsoft Windows Kernel win32k.sys Execute NULL Code Execution (MS11-034) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft Windows Kernel win32k.sys Execute NULL code execution (MS11-034)