Advisory Details

October 13th, 2011

Microsoft Office Excel Conditional Expression Ptg Type Confusion Vulnerability

CVE ID	CVE-2011-1989
CVSS SCORE	7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Office Excel
TREND MICRO CUSTOMER PROTECTION	Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['11597']. 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 Office Excel. 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 how the application parses expressions used for determining formatting requirements. Due to the application not handling certain components of the expression correctly, the application will treat one of the structures as a different type and consequently treat one of its arguments as a pointer. This pointer is used to fetch a virtual method table and can be used to achieve code execution under the context of the application.
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/ms11-072
DISCLOSURE TIMELINE	2011-06-01 - Vulnerability reported to vendor 2011-10-13 - Coordinated public release of advisory
CREDIT	Anonymous

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