TippingPoint Zero Day Initiative

Microsoft Office OWC10.Spreadsheet ActiveX BorderAround() Heap Corruption Vulnerability

ZDI-09-056: August 11th, 2009


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8298. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Microsoft Office. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.

The specific vulnerability exists in the OWC10.Spreadsheet.10 ActiveX control installed by Microsoft Office. By accessing specific methods in a certain order heap corruption occurs leading to remote code execution. If exploited, complete control of the affected system can be achieved under the rights of the currently logged in user.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2007-12-11 - Vulnerability reported to vendor
    2009-08-11 - Coordinated public release of advisory


This vulnerability was discovered by:
    Peter Vreugdenhil