ConPresso CMS 4.07 Session Fixation / XSS

`[HACKATTACK Advisory 25012009]ConPresso CMS 4.07 - Session Fixation, XFS, XSS  
  
Details  
************************  
Product: ConPresso CMS 4.07  
Security-Risk: moderated  
Remote-Exploit: yes  
Vendor-URL: http://www.conpresso.de/  
Vendor-Status: informed  
Advisory-Status: not yet published  
  
Credits  
************************  
Discovered by: David Vieira-Kurz  
http://www.HACKATTACK.at   
  
Affected Products:  
----------------------------  
ConPresso CMS 4.07 and prior  
  
Original Advisory:  
************************  
http://www.HACKATTACK.at/  
  
Introduction  
************************  
ConPresso CMS is a PHP-based Content Management System.  
  
More Details  
************************  
1. Cookie_Manipulation:  
---------------------  
The cookie variable "PHPSESSID" parameter can be set to a malicious and arbitrary value.  
  
1.1 Description:  
In a session fixation attack, the attacker fixes the user's session ID before the user even logs into the target server.  
After a user's session ID has been fixed, the attacker will wait for them to login.  
Once the user does so, the attacker uses the predefined session ID value to assume their online identity.  
  
Workaround:  
************************  
1. Do not accept session identifiers from GET / POST variables.  
2.Regenerate SID on each request.  
3. Accept only server generated SID:  
One way to improve security is to not accept session identifiers not generated by server.  
  
if ( ! isset( $_SESSION['SERVER_GENERATED_SID'] ) ) {  
session_destroy(); // destroy all data in session  
}  
session_regenerate_id(); // generate a new session identifier  
$_SESSION['SERVER_GENERATED_SID'] = true;  
  
  
2. Cross-Site-Scripting  
************************  
Input passed directly to the "/conpresso407/_admin/frame_titel.php" file in not proberly sanitized before being used and returned to the user.  
This can be exploited to inject arbitrary html and javascript code.  
  
3. Cross-Frame-Scripting  
************************  
A frame containing malicious code or a redirection to an opponents' site can be embedded using the cross-frame-scripting techniques.  
  
Affected: "/conpresso407/_manual/index.php?ref=http://www.evil-hacker-site.com"  
  
Solution  
************************  
Edit the source code to ensure that input is properly sanitised.  
You should work with "htmlspecialchars()" or "htmlentities()" php-function to ensure that html tags  
are not going to be executed.   
  
Example:  
# clean = array();  
# $html = array();  
# $html['username'] = htmlentities($clean['username'],ENT_QUOTES,UTF-8');   
?>  
  
About HACKATTACK  
================  
HACKATTACK IT SECURITY GmbH is a Penetrationtest and security Auditinf company located in Austria and Germany.  
  
Hotline Germany +49 (0)800 20 60 900  
Hotline Austria +43 (0)06223 20 6210  
More Information about HACKATTACK at  
http://www.HACKATTACK.at || http://www.HACKATTACK.eu  
`