SYMSA-2006-004 (Full Details): Vulnerability in Graphics Rendering Engine Could Allow Remote Code Execution
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Symantec Vulnerability Research
http://www.symantec.com/research
Security Advisory
Advisory ID : SYMSA-2006-004
Advisory Title: Vulnerability in Graphics Rendering Engine Could
Allow Remote Code Execution
Author : Peter Ferrie / peter_ferrie@xxxxxxxxxxxx
Release Date : 06-13-2006 (no details), 07-13-2006 (full details)
Application : Those which utilize the vulnerable function on
affected platforms
Platform : Windows 98, Windows 98 Second Edition, Windows
Millennium Edition
Severity : Remotely exploitable arbitrary code execution
Vendor status : Vendor verified, patch available (See MS06-026
and KB918547)
CVE Number : CVE-2006-2376
Reference : http://www.securityfocus.com/bid/18322
Overview:
A remote code execution vulnerability exists in the
Graphics Rendering Engine because of the way that it
handles Windows Metafile (WMF) images.
An attacker could exploit this by placing a specially
crafted WMF or EMF image on a webpage, or by sending
the image as an attachment in an e-mail. The exploit
is triggered by viewing the specially crafted image
file. No user interaction is required.
An attacker who successfully exploited this vulnerability
could take complete control of the affected system.
Details:
A heap overflow vulnerability exists in the WMF
PolyPolygon function, because of an unchecked user-
supplied parameter.
Specifically, an integer overflow can occur because
the sum of the entries in the vertex counts array is
added to the number of polygons, then multiplied by
six. This calculation is done without checking if the
result overflows a 32-bit integer.
The result is passed to a memory allocation routine,
which will allocate a small memory buffer when an integer
overflow occurs. The allocated buffer will then be filled
by the vertex data, which exceeds the size of the buffer,
causing heap corruption.
The manner of the heap corruption is under user control,
which can result in the execution of arbitrary code.
Vendor Response:
The above vulnerability was addressed for the affected
platforms via Microsoft Security Bulletin MS06-026. If
there are any further questions about this statement,
please contact secure@xxxxxxxxxxxxxx
Recommendation:
Follow your organization's testing procedures before
applying patches or workarounds. Customers should apply
Microsoft's update as soon as possible.
Common Vulnerabilities and Exposures (CVE) Information:
The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues. These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.
CVE-2006-2376
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