Check Point Advisories

Preemptive Protection against Internet Explorer XSLT Object Memory Corruption (MS11-057; CVE-2011-1963)

Check Point Reference: CPAI-2011-370
Date Published: 9 Aug 2011
Severity: Critical
Last Updated: 1 Jan 2011
Source: Microsoft Security Bulletin MS11-057
Industry Reference:CVE-2011-1963
CVE-2010-2558
Protection Provided by:
Who is Vulnerable? Internet Explorer 7 for:

Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 1 & 2
Windows Vista x64 Edition Service Pack 1 & 2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems
Windows Server 2008 for Itanium-based Systems Service Pack 2

Internet Explorer 8 for:

Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows 7 for 32-bit Systems Internet Explorer 8 for Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Internet Explorer 9 for:

Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems
Windows 7 for x64-based Systems Service Pack

Vulnerability Description A memory corruption vulnerability has been reported in an XSLT object within Microsoft Internet Explorer. A remote attacker can leverage this vulnerability to execute arbitrary code on an affected system, within the security context of the logged in user.
Update/Patch AvaliableApply patches from:
MS11-057
Vulnerability DetailsThis is a memory corruption vulnerability. The issue is caused due to an error in the way Internet Explorer attempts to access certain objects that have not been initialized or have been deleted. A remote attacker can exploit this vulnerability by enticing an unsuspecting victim to open a malicious web page. Successful exploitation of this vulnerability may cause a memory corruption condition which may allow an attacker to execute arbitrary code on an affected system.

Protection Overview

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