Advisory Details

October 15th, 2011

Microsoft Internet Explorer SetExpandedClipRect Remote Code Execution Vulnerability

CVE ID	CVE-2011-2001
CVSS SCORE	7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Internet Explorer
TREND MICRO CUSTOMER PROTECTION	Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['11740']. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within mshtml.dll and is a logic bug in the way it handles the 'extra size index' in certain CDispNode classes within the SetExpandedClipRect function. When the 'extra size index' is zero, the code fails to correctly adjust the class instance pointer before and uses the vftable pointer as a flag field. This corrupts the vftable pointer and can lead to remote code execution under the context of the current user. This issue is closely related to CVE-2009-3672.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: http://technet.microsoft.com/en-us/security/bulletin/ms11-081
DISCLOSURE TIMELINE	2011-07-21 - Vulnerability reported to vendor 2011-10-15 - Coordinated public release of advisory
CREDIT	Anonymous

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