exploits , vulnerabilities , articles , LS simple guestbook (v1) Remote Code Execution Vulnerability

Rated as : High Risk

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

securitydot.net - 2007-04-15