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fan-Guestbookv2.0.1.txt

fan-Guestbookv2.0.1.txt
Posted Jul 18, 2006
Authored by Omnipresent | Site it.security.netsons.org

Fantastic GuestBook version 2.0.1 suffers from XSS due to improper input sanitization.

tags | advisory
SHA-256 | 7c86243db7e915d333495525d6984f897b4c10ccaa62dbac9813d3482e6686cf

fan-Guestbookv2.0.1.txt

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.:. Fantastic Guestbook v2.0.1 Advisory .:.

Date of written Advisory:
-------------------------

July, 11 2006

Product:
--------

Fantastic Guestbook v2.0.1

Vendor:
-------

http://fscripts.com/

Description:
------------

Fantastic GuestBook version 2.0.1 is simple GuestBook; where remote user without authentication can post their own message.
No authentication is required! Every body can post message.

Exploit(s) / Vulnerability(ies):
--------------------------------

Fantastic GuestBook version 2.0.1 is affected by a Remote XSS Vulnerability.
Some variables are not properly sanitized before being used.
Here you will find the variables not properly sanitized:

[...]
'first_name'=>$_POST['first_name'],

'last_name'=>$_POST['last_name'],
'nickname'=>$_POST['nickname'],

[...]

PoC(s):
-------

If a malicious people go into the sign in form and put in the fields First Name, Last Name and Nick Name a code like this:

<script>alert("XSS")</script>

When you load the page http://127.0.0.1/[path]/guestbook.php or you read the messages of the guestbook you will se a pop-up that "say" 'XSS'.

Vendor Status:
--------------

July, 2006/11 - Not Informed!

Solution:
---------

At the moment (July, 2006/11) there are no solutions from the vendor. If you want to make sure the code and your GuestBook you have to sanitize the variables:
firs_name
last_name
nick_name

Credits:
--------

omnipresent
omnipresent[at]email[dot]it
http://it.security.netsons.org


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