XSS in Postnuke Rogue release (0.72)

[Muhammad Faisal Rauf Danka <mfrd () attitudex com>]

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.

P.S. Email was sent to security () postnuke org which was bounced back. I couldn’t find any 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.

On postnuke’s own website this issue is handled very effectively by bouncing the user back to the “./index.php” without 
giving any errors, thus reducing the chances of webroot disclosure too. I hope such functionality be added to the 
downloadable version of postnuke’s latest build too for the benefit of the users. 


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

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