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securityvulnsSecurityvulnsSECURITYVULNS:DOC:16729
HistoryApr 17, 2007 - 12:00 a.m.

LS simple guestbook - arbitrary code execution

2007-04-1700:00:00
vulners.com
20

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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