bugtraq - LS simple guestbook - arbitrary code execution

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Message-ID: <20070415035322.8081.qmail@securityfocus.com>
Date: 15 Apr 2007 03:53:22 -0000
From: jd2k2000@...mail.com
To: bugtraq@...urityfocus.com
Subject: LS simple guestbook - arbitrary code execution

########################################################
#   Special Greetings To - Timq,Warpboy,The-Maggot     #
########################################################

File: index.php
Affects: LS simple guestbook (v1)
Date: 15th April 2007

Issue Description:
===========================================================================
LS simple guestbook fails to sanitize user input that it writes to the 
posts.txt file when the user leaves a message, this file is then included 
causing any php code within it to be run.
===========================================================================

Scope:
===========================================================================
An attacker can inject arbitrary php code and potentially execute commands 
on the system.
===========================================================================

Recommendation:
===========================================================================
Add the following line of code in index.php: 

$message = strip_tags($message);

just above: 

if ($message != "") {$file = fopen("$dataf","a");
===========================================================================

Example:

name = Test
message = <?php phpinfo(); ?>

Discovered By: Gammarays