TippingPoint Zero Day Initiative

Microsoft Office RTF Consecutive Drawing Object Parsing Heap Corruption Vulnerability

ZDI-08-084: December 9th, 2008


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 6607. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote 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, open a malicious e-mail, or open a malicious file.

The specific flaw exists when parsing malformed RTF documents. When processing consecutive "\do" Drawing Object tags mso.dll does not properly verify the integrity of the object and frees a memory buffer twice, leading to heap corruption. Successful exploitation can lead to remote compromise of a system under the credentials 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

    2008-05-19 - Vulnerability reported to vendor
    2008-12-09 - Coordinated public release of advisory


This vulnerability was discovered by:
    wushi of team509