[NT] Microsoft GDI WMF Parsing Heap Overflow Vulnerability (MS08-021)

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Microsoft GDI WMF Parsing Heap Overflow Vulnerability (MS08-021)


A vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Microsoft Windows. User interaction is
required in that a user must open a malicious file or visit a malicious
web page.


Vulnerable Systems:
* Microsoft Windows XP SP2
* Microsoft Windows 2003 SP1
* Microsoft Windows Vista

The specific flaw exists within the parsing of malformed WMF files. A
vulnerability exists in the GDI funcion CreateDIBPatternBrushPt used when
processing WMF files. Due to a mis-calculation of user data a heap chunk
can be under-allocated and later used resulting in a heap overflow.
Successful exploitation can result in system compromise 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:

CVE Information:


The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
The Zero Day Initiative.
The original article can be found at:


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