[转载]Local buffer-overflow in W32Dasm 8.93

文章作者：Luigi Auriemma

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                    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


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===============
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
由于考虑到POC大家可能有人下不了 我在文章末尾上传了


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4) Fix
======


No fix.
This program is no longer supported.


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