[NT] Microsoft Windows GDI+ Gradient Fill Heap Overflow Vulnerability



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Microsoft Windows GDI+ Gradient Fill Heap Overflow Vulnerability
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SUMMARY

The <http://msdn.microsoft.com/en-us/library/ms533797(VS.85).aspx> GDI+
library, or "GdiPlus.dll", "provides access to a number of graphics
methods, via a class-based API. Vector Markup Language (VML) is a
component of the Extensible Markup Language (XML) that specifies vector
images (e.g., rectangles and ovals) using the GDI+ API". Remote
exploitation of an integer overflow vulnerability in multiple versions of
Microsoft Corp.'s GDI+ could allow an attacker to execute arbitrary code
within the context of the local user.

DETAILS

Vulnerable Systems:
* Internet Explorer 7
* Internet Explorer 6
* VGX.DLL version 7.00.6000.20628
* VGX.DLL version 7.00.6000.16386
* VGX.DLL version 6.00.2900.3051
* VGX.DLL version 6.00.2900.2997

The vulnerability specifically exists in the memory allocation performed
by the GDI+ library. Certain malformed gradient fill input can cause the
application to corrupt the heap, potentially allowing arbitrary code
execution.

Analysis:
Exploitation of this vulnerability may allow an attacker to execute
arbitrary code in the context of the current user. To exploit this
vulnerability, the attacker would need to convince a targeted user to
render a document with an application that utilizes the vulnerable GDI+
functions. This could be accomplished by persuading the user to follow a
link, view a document, or read an e-mail message.

Workaround:
In order to prevent exploitation of this vulnerability, unregister or deny
access to vgx.dll and/or gdiplus.dll. Note that doing so will prevent
proper rendering of documents that rely on the affected component.

Vendor response:
Microsoft has officially addressed this vulnerability with Security
Bulletin MS08-052. For more information, consult their bulletin at the
following URL.
<http://www.microsoft.com/technet/security/bulletin/ms08-052.mspx>
http://www.microsoft.com/technet/security/bulletin/ms08-052.mspx

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5348>
CVE-2007-5348

Disclosure Timeline:
05/09/2007 - Initial vendor notification
05/09/2007 - Initial vendor response
09/09/2008 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by
<mailto:idlabs-advisories@xxxxxxxxxxxx> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=743>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=743



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