ZDI-08-049: Microsoft Windows Graphics Rendering Engine PICT Heap 
Corruption
http://www.zerodayinitiative.com/advisories/ZDI-08-049
August 12, 2008

-- CVE ID:
CVE-2008-3021

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft File Format Vulnerability

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TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 4665. 
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-- Vulnerability Details:
A potential vulnerability exists in the Microsoft Office Suite.  The
issue is a result of insufficient bounds checking on the content of PICT
files embedded into documents.  Successful exploitation of this issue
enables an attacker to remotely execute arbitrary code on a target
system.  User interaction would be required, as an attacker would have
to convince the target user to open a malformed file.

One of the filter DLLs for processing image files in Microsoft Office
suffers from a potentially-exploitable memory corruption condition when
processing .PICT images.  An invalid value in the bits_per_pixel field
(offset 0x257) causes heap corruption.  Different values of this field
result in distinctly different types of corruption.  Internally, the
issue was only reproducible when the malformed image was directly
inserted into an Office document by the target 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/MS08-044.mspx

-- Disclosure Timeline:
2006-09-14 - Vulnerability reported to vendor
2008-08-12 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Damian Put <pucik@overflow.pl>

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