Advisory Details

February 7th, 2011

(0day) Microsoft Office Excel Office Art Object Parsing Remote Code Execution Vulnerability

ZDI-11-041
ZDI-CAN-829

CVE ID CVE-2011-0979
CVSS SCORE 9, (AV:N/AC:L/Au:N/C:P/I:P/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Excel
TIPPINGPOINT™ IPS CUSTOMER PROTECTION TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11046. 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 the way the application parses an Office Art record within a Microsoft Excel Document. Specifically, when parsing an office art object record, if an error occurs, the application will add a stray reference to an element which is part of a linked list. When receiving a window message, the application will proceed to navigate this linked list. This will access a method from the malformed object which can lead to code execution under the context of the application.

VENDOR RESPONSE Microsoft states:

Patched April 12, 2011
http://www.microsoft.com/technet/security/bulletin/ms11-021.mspx


DISCLOSURE TIMELINE
  • 2010-06-30 - Vulnerability reported to vendor
  • 2011-02-07 - Coordinated public release of advisory
CREDIT Anonymous
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