lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <20050124214911.414aebb9.aluigi@autistici.org>
From: aluigi at autistici.org (Luigi Auriemma)
Subject: Local buffer-overflow in W32Dasm 8.93


#######################################################################

                             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@...istici.org
              web:    http://aluigi.altervista.org


#######################################################################


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.


#######################################################################

======
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.


#######################################################################

===========
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


Powered by blists - more mailing lists