8Pixel Blog CMS v4.2 - Cross Site Scripting Vulnerability

Document Title:
===============
8Pixel Blog CMS v4.2 - Cross Site Scripting Vulnerability



Release Date:
=============
2011-08-14


Vulnerability Laboratory ID (VL-ID):
====================================
1


Product & Service Introduction:
===============================
8pixel.net developes applications for the .NET platform. We develop browser based, windows applications and combinations of both.
As well we provide some apps for download, such as 8pixel.net blog v4. 

(Copy of the Vendor Homepage: http://8pixel.net/)


Abstract Advisory Information:
==============================
The Vulnerability-Lab Team discovered multiple persistent Cross-Site-Scripting Vulnerability on  8Pixel Blog v4.2
Remote attackers can implement malicious persistent script code on a main software module of the blog/cms.


Vulnerability Disclosure Timeline:
==================================
2011-08-15: Discovery by Vulnerability-Lab


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
A XSS(Cross-Site-Scripting) vulnerability is detected on 8Pixel Blog v4.x. Remote attackers can include persistent malicious script codes 
on application-side. When sucessfully exploited by an authenticated user, the identified vulnerabilities can lead to Information 
Disclosure, Session Hijacking, access to Web Interface. Its also possible to load malware or scripts out of the comment context 
of the website. 

Vulnerable Module(s):	
                                                              [+] Comments - E-Mails & Names


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by local restricted user or remote attackers without auth. The vulnerability can reproduced 
by the following way/example ...

Methods:		[+] XSS Restriction Bypass - Cross-Site-Scripting

1. Open the Blog Website
2. Open a post and switch to the comments under the article
3. Implement your malicious persistent script on the vulnerable input fields (name & email)
4. After saving the input is persistent implemented on application-side
5. Malicious script code will be executed on every request of the article by users/administrators


PoC:
>"<iframe src=http://global-evolution.info width=800 hight=800>@aollamer.com
>"<script>alert(document.cookie)</script><div style="[email protected]

Note: The @ on the script code (poc)  is required because of the input field restriction on mail.


Security Risk:
==============
The security risk of the persistent input validation vulnerabilities are estimated as medium.


Credits & Authors:
==================
Vulnerability Research Laboratory


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=========================
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