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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 (at) symantec (dot) com [email concealed]

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 (at) microsoft (dot) com. [email concealed]

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

- -------Symantec Vulnerability Research Advisory Information-------

For questions about this advisory, or to report an error:

research (at) symantec (dot) com [email concealed]

For details on Symantec's Vulnerability Reporting Policy:

http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf

Symantec Vulnerability Research Advisory Archive:

http://www.symantec.com/research/

Symantec Vulnerability Research GPG Key:

http://www.symantec.com/research/Symantec_Vulnerability_Research_GPG.asc

- -------------Symantec Product Advisory Information-------------

To Report a Security Vulnerability in a Symantec Product:

secure (at) symantec (dot) com [email concealed]

For general information on Symantec's Product Vulnerability

reporting and response:

http://www.symantec.com/security/

Symantec Product Advisory Archive:

http://www.symantec.com/avcenter/security/SymantecAdvisories.html

Symantec Product Advisory PGP Key:

http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.a
sc

- ---------------------------------------------------------------

Copyright (c) 2006 by Symantec Corp.

Permission to redistribute this alert electronically is granted

as long as it is not edited in any way unless authorized by

Symantec Consulting Services. Reprinting the whole or part of

this alert in any medium other than electronically requires

permission from cs_advisories (at) symantec (dot) com. [email concealed]

Disclaimer

The information in the advisory is believed to be accurate at the

time of publishing based on currently available information. Use

of the information constitutes acceptance for use in an AS IS

condition. There are no warranties with regard to this information.

Neither the author nor the publisher accepts any liability for any

direct, indirect, or consequential loss or damage arising from use

of, or reliance on, this information.

Symantec, Symantec products, and Symantec Consulting Services are

registered trademarks of Symantec Corp. and/or affiliated companies

in the United States and other countries. All other registered and

unregistered trademarks represented in this document are the sole

property of their respective companies/owners.

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