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Category:   Application (Multimedia)  >   Winamp Vendors:   Nullsoft
Winamp Error in Processing m3u/pls Files With '.wma' File Extension Lets Remote Users Deny Service
SecurityTracker Alert ID:  1015565
SecurityTracker URL:  http://securitytracker.com/id/1015565
CVE Reference:   CVE-2005-3188   (Links to External Site)
Date:  Feb 2 2006
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  
Version(s): prior to 5.11
Description:   iDEFENSE reported a vulnerability in Winamp. A remote user can cause denial of service conditions and may be able to execute arbitrary code.

A remote user can create a specially crafted m3u or pls file with a target filename that has a '.wma' file extension that, when loaded by the target user, will cause the target user's Winamp player to crash. It may also be possible to cause arbitrary code to be executed.

The vendor was notified on October 12, 2005, without response.

This vulnerability was discovered by b0f.

The original advisory is available at:

http://www.idefense.com/intelligence/vulnerabilities/display.php?id=378

Impact:   A remote user can create a specially crafted file that, when loaded by the target user, will cause the target user's Winamp player to crash. It may also be possible to cause arbitrary code to be executed.
Solution:   The vendor silently released a fixed version (5.11) without mention of this vulnerability.

The latest version is available at:

http://www.winamp.com/player/

Vendor URL:  www.winamp.com/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  iDefense Security Advisory 02.01.06: Winamp m3u/pls .WMA Extension

Winamp m3u/pls .WMA Extension Buffer Overflow Vulnerability

iDefense Security Advisory 02.01.06
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=378
February 1, 2006

I. BACKGROUND

Winamp is a popular media player for Windows which supports many
audio/video file formats.

More information can be obtained from the vendors site at:

 http://winamp.com/player/

II. DESCRIPTION

It has been found that a specially crafted m3u or pls file with a
target filename having the .wma extension can crash Winamp giving the
attacker control over the EAX register.

Example m3U file format:

#EXTM3U
#EXTINF:,VULN
AAAA[...]AA.wma

Example pls file format:

[playlist]
numberofentries=5
File1=AAAA[...]AA.wma
Title1=
Length5=-1
Version=2

III. ANALYSIS

When Winamp is installed it registers the m3u and pls extensions so that
such files  will automatically open in Winamp. This exploit can be
triggered by clicking on a link in a web page, or through the use of
malicious javascript.

The crash occurs in the Winamp module with the following instructions:

mov edx, [eax]
call [edx+24]

The number of characters that can be inject is limited. With control
of the EAX register injected into the above code, meaningful
shellcode execution is possible.

IV. DETECTION

This vulnerability has been verified in version 5.094 of Winamp.

V. WORKAROUND

Removing the file mapping for m3u and pls files to Winamp should
mitigate the risk of exploitation.

VI. VENDOR RESPONSE

The vendor has not responded to communication regarding this
vulnerability.

The vulnerability appears to have been silently fixed in Winamp 5.11.
Version 5.13 is now available for download at:

  http://www.winamp.com/player/

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-3188 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

10/12/2005 Initial vendor notification
02/01/2006 Coordinated public disclosure

IX. CREDIT

This vulnerability was discovered by b0f.

Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp

Free tools, research and upcoming events
http://labs.idefense.com

X. LEGAL NOTICES

Copyright (c) 2006 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice@idefense.com for permission.

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.

_______________________________________________
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http://www.idefense.com/mailman/listinfo/idlabs-advisories
 
 


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