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Luigi Auriemma
Application: Cheese Tracker
http://reduz.com.ar/cheesetracker/
http://sourceforge.net/projects/cheesetronic
Versions: <= 0.9.9 and current CVS
Platforms: *nix and others
Bug: buffer-overflow in Loader_XM::load_instrument_internal
Exploitation: local
Date: 23 Jul 2006
Author: Luigi Auriemma
e-mail: aluigi@autistici.org
web: aluigi.org
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1) Introduction
2) Bug
3) The Code
4) Fix
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==============1) Introduction
==============
Cheese Tracker is a well known music tracker for the CT, IT, XM and S3M
file formats.
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=====2) Bug
=====
The XM loader used by Cheese Tracker is affected by a buffer-overflow
vulnerability which happens when it tries to store the exceeding data
available in the input file in the junkbuster buffer of only 500 bytes.
>From cheesetracker/loaders/loader_xm.cpp:
Loader::Error Loader_XM::load_instrument_internal(Instrument *p_instr,bool p_xi,int p_cpos, int p_hsize, int p_sampnum) {
...
if (!p_xi) {
if ((reader.get_file_pos()-p_cpos)