ZDI-08-085: Microsoft Office RTF Drawing Object Heap Overflow Vulnerability

[zdi-disclosures@xxxxxxxx]

ZDI-08-085: Microsoft Office RTF Drawing Object Heap Overflow 
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-08-085
December 9, 2008

-- CVE ID:
CVE-2008-4028

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft Office Word
Microsoft Outlook

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 6611. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of various Microsoft products including Word,
Outlook and WordPad. 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:

http://www.microsoft.com/technet/security/bulletin/MS08-072.mspx

-- 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

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