bugtraq - Format string and buffer-overflow in Lst Network Print Server 9.4.2 build 105

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Date: Mon, 11 Feb 2008 19:29:35 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com,
	news@...uriteam.com, full-disclosure@...ts.grok.org.uk,
	vuln@...unia.com, packet@...ketstormsecurity.org
Subject: Format string and buffer-overflow in Lst Network Print Server 9.4.2
 build 105


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

                             Luigi Auriemma

Application:  Larson Software Technology Network Print Server
              http://www.cgmlarson.com/products/NetworkPrintServer.php
Versions:     <= 9.4.2 build 105
Platforms:    Windows
Bugs:         A] format string in logging
              B] license buffer-overflow
Exploitation: remote
Date:         11 Feb 2008
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org


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


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


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

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


LstNPS is a CGM print server for Windows.


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

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

---------------------------
A] format string in logging
---------------------------

The server is affected by a format string vulnerability located in the
logging functions (by default enabled and set on "Information") which
passes the log message directly to vsnprintf without the format
argument.


--------------------------
B] license buffer-overflow
--------------------------

The LICENSE command handled by the server leads to a buffer-overflow
vulnerability when a license string longer than 128 bytes is copied in
a stack buffer using strncpy in the wrong way.


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

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


A]
echo USEP %n%n%n%s%s%s|nc SERVER 3114 -v -v

B]
echo LICENSE aaaaa...160...aaaaa|nc SERVER 3114 -v -v


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

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


No Fix


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


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