Buffer-overflow and directory traversal in Asus Video Security 3.5.0.0

[Luigi Auriemma <aluigi () autistici org>]

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                             Luigi Auriemma

Application:  Asus Video Security
              http://www.asus.com/products1.aspx?l1=2&share=icon/12
Versions:     <= 3.5.0.0
              (the version number is chaotic, this one seems the most
              recent but doesn't exist an official website with the
              latest updates and Asus didn't reply to me)
Platforms:    Windows
Bugs:         A] authorization buffer-overflow
              B] directory traversal
Exploitation: remote
Date:         02 Nov 2005
Author:       Luigi Auriemma
              e-mail: aluigi () autistici org
              web:    http://aluigi.altervista.org


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1) Introduction
2) Bugs
3) The Code
4) Fix


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


Asus Video Security is a monitoring software bundled with Asus graphic
cards.
By default the built-in web server is disabled so these bugs can be
exploited "only" if it has been manually activated.


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=======
2) Bugs
=======

--------------------------------
A] authorization buffer-overflow
--------------------------------

Exists a buffer-overflow which happens during the handling of the
decoded (base64) username:password string sent to a password protected
ASUS Video Security web server.
The server is not vulnerable if doesn't use authorization.


----------------------
B] directory traversal
----------------------

The built-in web server is also vulnerable to a classical directory
traversal bug which allows an attacker to download any file in the disk
where the program is installed.
That's possible through the usage of the dot-dot-slash and backslash
patterns (HTTP encoded chars are not allowed in the web server).
If the server is protected with password the attacker must know the
right keyword.


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===========
3) The Code
===========


http://aluigi.altervista.org/poc/asusvsbugs.zip


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======
4) Fix
======


No fix.
No reply from the vendor.


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--- 
Luigi Auriemma 
http://aluigi.altervista.org