WelcomeEnterpriseSmall BusinessHome & Home OfficePartnersAbout Symantec

Microsoft DirectX DirectShow AVI Processing Buffer Overflow Vulnerability

Risk
High

Date Discovered
10-11-2005

Description
A buffer overflow vulnerability exists in the Microsoft Windows DirectX component. This issue is related to processing of .AVI (Audio Visual Interleave) media files. The specific vulnerability exists in DirectShow and could be exposed through applications that employ DirectShow to process .AVI files.

Successful exploitation will permit execution of arbitrary code in the context of the user who opens a malicious .AVI file.

This issue could be exploited through any means that will allow the attacker to deliver a malicious .AVI file to a victim user. In Web-based attack scenarios, exploitation could occur automatically if the malicious Web page can cause the .AVI file to be loaded automatically by Windows Media Player. Other attack vectors such as email or instant messaging may require the victim user to manually open the malicious .AVI.

It is not known if third-party applications rely on DirectShow to process .AVI files. If so, these applications could also present an attack vector.

Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released October 11, 2005.

Symantec Enterprise Security Manager
Symantec Enterprise Security Manager™ posted an update to the OS Patch Policy that detects and reports systems that are not patched against this vulnerability. Click here for the advisory released October 13, 2005.

Symantec Enterprise Security Manager Network Assessment Module
Symantec Enterprise Security Manager Network Assessment Module detects and reports this vulnerability. Click here for the advisory released October 19, 2005.

Platforms Affected
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Advanced Server SP3
Microsoft Windows 2000 Advanced Server SP4
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Datacenter Server SP3
Microsoft Windows 2000 Datacenter Server SP4
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional SP2
Microsoft Windows 2000 Professional SP3
Microsoft Windows 2000 Professional SP4
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Server SP3
Microsoft Windows 2000 Server SP4
Microsoft Windows ME
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Datacenter Edition 64-bit
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Enterprise Edition 64-bit
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP 64-bit Edition
Microsoft Windows XP 64-bit Edition SP1
Microsoft Windows XP Home
Microsoft Windows XP Home SP1
Microsoft Windows XP Media Center Edition
Microsoft Windows XP Professional
Microsoft Windows XP Professional SP1

Components Affected
Microsoft DirectX 7.0
Microsoft DirectX 8.0 a
Microsoft DirectX 8.0
Microsoft DirectX 8.1 b
Microsoft DirectX 8.1 a
Microsoft DirectX 8.1
Microsoft DirectX 8.2

Recommendations
Do not accept or execute files from untrusted or unknown sources.
Do not accept or open any files that originate from an untrusted source. Malicious .AVI files may be sent in email, hosted on a Web page, sent through instant messaging or other means.

Do not follow links provided by unknown or untrusted sources.
Do not visit Web sites of questionable integrity, especially if solicited to do so by an untrusted or unfamiliar source.

Implement multiple redundant layers of security.
Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.

Run all software as a non-privileged user with minimal access rights.
All non-administrative activities should be performed as an unprivileged user with minimal access rights. This includes reading email, browsing the Web, or using instant messaging clients.

Microsoft has released updates to address this vulnerability. Fixes for Windows 98/98SE/ME are available through Windows Update.



Microsoft DirectX 7.0:
Microsoft DirectX 8.0 a:

Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

Microsoft DirectX 8.0:
Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

Microsoft DirectX 8.1 b:
Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

Microsoft DirectX 8.1 a:
Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

Microsoft DirectX 8.1:
Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

Microsoft DirectX 8.2:
Microsoft Patch Security Update for DirectX 8 for Windows 2000 (KB904706)
http://www.microsoft.com/downloads/details.aspx?familyid=FEDC7212-27B8-4993-9965-53E9298DB386&displaylang=en

References
Source: Microsoft Security Bulletin MS05-050
URL: http://www.microsoft.com/technet/security/Bulletin/MS05-050.mspx

Source: Windows Media Player 9 AVI Memory Modification Vulnerability
URL: http://www.eeye.com/html/research/advisories/AD20051011a.html

Credits
Discovery is credited to Fang Xing of eEye Digital Security.


Copyright © 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 Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

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, Symantec Security Response, and secure@symantec.com 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.