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List: bugtraq
Subject: Local buffer-overflow in W32Dasm 8.93
From: Luigi Auriemma <aluigi () autistici ! org>
Date: 2005-01-24 21:49:11
Message-ID: 20050124214911.414aebb9.aluigi () autistici ! org
[Download RAW message or body]
#######################################################################
Luigi Auriemma
Application: W32Dasm
(was http://www.expage.com/page/w32dasm)
Versions: <= 8.93 (8.94???)
Platforms: Windows
Bug: buffer-overflow
Exploitation: local
Date: 24 Jan 2005
Author: Luigi Auriemma
e-mail: aluigi@autistici.org
web: http://aluigi.altervista.org
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1) Introduction
2) Bug
3) The Code
4) Fix
#######################################################################
===============
1) Introduction
===============
W32Dasm is a cool and famous disassembler/debugger developed by URSoft.
It has tons of functions and, also if it is no longer supported by long
time, it is still widely used by a lot of people.
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======
2) Bug
======
The program uses the wsprintf() function to copy the name of the
imported/exported functions of the analyzed file into a buffer of only
256 bytes, with the possibility for an attacker to execute malicious
code.
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===========
3) The Code
===========
Exploiting the bug is very simple, all you need is to get an executable
and searching for the name of an imported or exported function to
modify.
I have written a very simple proof-of-concept that overwrites the
return address with 0xdeadc0de:
http://aluigi.altervista.org/poc/w32dasmbof.disasm_me
#######################################################################
======
4) Fix
======
No fix.
This program is no longer supported.
#######################################################################
---
Luigi Auriemma
http://aluigi.altervista.org
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