Advisory Details

October 13th, 2011

Microsoft Office Graph DataFormat Signed Index Code Execution Vulnerability

CVE ID	CVE-2011-1990
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 ['11598']. 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 2007. 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 the implementation of a record inside a Microsoft Office Excel or PowerPoint document. When parsing a signed field from this structure, the application will use the field to seek into an array of objects. Due to this unbounded index, an attacker can cause an element outside the array to be treated as a different type. This type of corruption can lead to 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	Omair

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