12/09/03

Moozatech Advisory		http://www.moozatech.com/mt-12-09-2003.txt		

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Application: MyServer Web Server
Web Site:    http://myserverweb.sf.net
Versions:    0.4.3
Platform:    Windows98,Windows2000,Linux
Bug:         Buffer Overflow.
Risk:        Remote DOS and unauthorized remote access.
Severity:    High
Fix Available: Yes
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1) Introduction
2) Bug
3) The Code
4) Fix
5) About Moozatech

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

MyServer is a free, powerful web server program designed to be easily run on a personal 
Computer by the average computer user. 
It is a multithread application and supports HTTP, CGI, ISAPI, WinCGI and FastCGI protocols. 


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2) Bug
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a buffer overflow might allow Remote attacker to invoke malicious code by submitting a request containing excessive data. 
That will cause a buffer overflow and might allow to run code of choice Under the web server privileges.
The problem is in the MSCGI library (cgi-lib.dll) that doesn’t handle correctly long 
String values for the URI variables. 


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3) Proof of concept.
====================

nc.exe -v www.victim.com < request.txt
 
--
The script is attached.
This will crash the program with a memory overflow.


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4) Fix
======

The author has confirmed this bug and temporary fix is available through 
MyServer cvs repository at:
http://myserverweb.sourceforge.net/cvs.php
Complete patch will be available in the next upcoming release of myserver.


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5) About Moozatech
==================

Moozatech IT Systems Ltd. (“Moozatech”) is a leading information security consulting 
and project management firm focused on developing 
"Secure IT Solutions" which best suit the client's operational needs. 
Moozatech devotes time to make a secure computing environment for customers.