bugtraq - Winamp 5.07 (latest version) Remote Crash + other stupid shizle

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Date: 13 Dec 2004 19:13:03 -0000
From: b0f www.b0f.net <b0fnet@...oo.com>
To: bugtraq@...urityfocus.com
Subject: Winamp 5.07 (latest version) Remote Crash + other stupid shizle

Winamp 5.07 (latest version) Remote Crash.
+ vuln to cause 100% cpu usage.

13/12/04

I. BACKGROUND

Winamp is a very popular windows audio 
and video player. It also has alot 
of other features and is used by 
millions of people across the world.

II. DESCRIPTION

VULN 1.

There is a vuln in winamp's handling of .mp4 
and .m4a files. Which when exploited can 
remotly crash the victims winamp.

The vuln lies in the .mp4 tagging system
which winamp uses.If you use winamps 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.

now how to crash it remotly.

if we create a .pls file contaning the data

[playlist]
numberofentries=5
File1=http://b0f.pwp.blueyonder.co.uk/a.mp4
Title1=
Length5=-1
Version=2

and make a html page containing an iframe linking
to the .pls like.

<html>
<iframe src="http://b0f.pwp.blueyonder.co.uk/exp2.pls">

now if the victim clicks a link to a page like

http://b0f.pwp.blueyonder.co.uk/wexp3.htm

it will auto open up the .pls file and load the .mp4
file into winamp and crash it.

This could also be done with .m3u instead of .pls

VULN 2.

This one is simple if you create say a 1mb file
probably smaller filled with junk and name it
with either .nsv or .nsa file extension. 
When opened in winamp it will cause 100% cpu
usage. The bigger the size of the file the 
more it will probably slow down the system.

III. ANALYSIS

Vuln 1.
Successful exploitation allows remote attackers to 
crash the victims winamp.

Vuln 2.
Successful exploitation causes 100% cpu usage.

IV. DETECTION

This has been confirmed in the latest version of winamp
5.07 and probably vuln in earlier versions.

V. WORKAROUND

Don't open suspicous .mp4 .m4a .nsa or .nsv files or click untrusted links.

VI. VENDOR

The vendor has not been contacted.
Why bother ? one asks

VII. CREDIT

Alan M aka b0f
(b0fnet@...oo.com)

P.S Buy Tupac - Loyal to the Game 
out 14/12/04