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Category:   Application (Forum/Board/Portal)  >   PostNuke Vendors:   postnuke.com
PostNuke Input Filtering Error in 'modules.php' Facilitates Remote Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1005583
SecurityTracker URL:  http://securitytracker.com/id/1005583
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Updated:  Nov 18 2002
Original Entry Date:  Nov 8 2002
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Exploit Included:  Yes  
Version(s): 0.72
Description:   GemSEC reported an input validation vulnerability in PostNuke in the 'sid' argument of 'modules.php'. A remote user can conduct cross-site scripting attacks against PostNuke users.

A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running PostNuke and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit URL is provided:

http://ip.ad.dr.ess/postnuke/html/modules.php?op=modload&name=News&file=article&sid=<script>alert(document.cookie);</script>exploitstring

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running PostNuke, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.postnuke.com (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
(Vendor Issues Fix) Re: PostNuke Input Filtering Error in 'modules.php' Facilitates Remote Cross-Site Scripting Attacks
The vendor has issued a fix.



 Source Message Contents

Subject:  XSS in Postnuke Rogue release (0.72)



Program: Postnuke Rogue release (0.72) (Latest).
HomePage: www.Postnuke.com/.org

Description:

PostNuke is a weblog/Content Management System (CMS). Whilst PostNuke is a fork of
PHP-Nuke, the entire core of the product has been replaced, making it far more secure and
stable, and able to work in high-volume environments with ease. 

Some of the highlights of PostNuke are 
customisation of all aspects of the website's appearance through themes, including CSS
support 
the ability to specify items as being suitable for either a single or all languages 
the best guarantee of displaying your webpages on all browsers due to HTML 4.01
transitional compliance 
a standard API and extensive documentation to allow for easy creation of extended
functionality through modules and blocks 

Problem: 

The XSS was found fixed on postnuke's own website, but not in their code available for
download.

I have previously mentioned it on bugtraq too:

http://online.securityfocus.com/archive/1/293813

Recently a friend emailed and informed me that his latest build still has same problem,
which I mentioned in my earlier post. I thought since it was fixed on postnuke's own
website then probably it'd be patched in their latest build too.

I just checked it again by downloading and building fresh postnuke.

The popup still comes, along with DB error.

Exploit:
http://ip.ad.dr.ess/postnuke/html/modules.php?op=modload&name=News&file=article&sid=<script>alert(document.cookie);</script>

WorkAround: 
Wait for a fixed version by postnuke team. Or edit the php script to validate input
properly for script tags as well.

contact address on their website, except for registering myself on their forums. And as
someone else also mentioned that why should one be bound to register there just for a
contact.

disclosure too. I hope such functionality be added to the downloadable version of


Regards
--------
Muhammad Faisal Rauf Danka

Head of GemSEC / Chief Technology Officer
Gem Internet Services (Pvt) Ltd.
web: www.gem.net.pk
Key Id: 0x784B0202
Key Fingerprint: 6F8C EDCF 6C6E 06A5 48D7 6A20 C592 484B 
784B 0202

_____________________________________________________________
---------------------------
[ATTITUDEX.COM]
http://www.attitudex.com/
---------------------------

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