TippingPoint Zero Day Initiative
 

Microsoft Office RTF Drawing Object Heap Overflow Vulnerability

ZDI-08-085: December 9th, 2008

CVE ID

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 6611. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of various Microsoft products including Word and Outlook. 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 within the parsing of RTF documents containing multiple drawing object tags. First, code within wwlib.dll allocates a buffer for the tag object. Later, a result from a call into mso.dll is copied into the same buffer but with a larger size than was allocated by the callee. 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

    2008-06-25 - Vulnerability reported to vendor
    2008-12-09 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    wushi of team509