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NodeBB v0.8.2 - Client Side Cross Site Web Vulnerability

Document Title:
===============
NodeBB v0.8.2 - Client Side Cross Site Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1600


Release Date:
=============
2015-09-24


Vulnerability Laboratory ID (VL-ID):
====================================
1607


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
NodeBB is a next-generation discussion platform that utilizes web sockets for 
instant interactions and real-time notifications. 
NodeBB forums have many modern features out of the box such as social network 
integration and streaming discussions. NodeBB is an 
open source project which can be forked on GitHub. 

(Copy of Vendor page https://docs.nodebb.org/en/latest/ &  
https://github.com/NodeBB/NodeBB/)


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a client-side 
vulnerability in the offical NodeBB v0.8.2 forum web-application.


Vulnerability Disclosure Timeline:
==================================
2015-09-24:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
NodeBB v0.8.2


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
A non-persistent input validation web vulnerability has been discovered in the 
offical NodeBB v0.8.2 forum web-application.
The security vulnerability allows remote attackers to manipulate client-side 
application to browser requests to compromise user session data.

The vulnerability is located in the `url` values of the `outgoing` module. 
Remote attackers are able to inject malicious script codes to client-side 
browser to application requests. Remote attackers are able to prepare special 
crafted weblinks to execute client-side script code that compromises the 
src/controllers/index.js GET data. The execution of the script code occurs in 
the src/controllers/index.js module. The attack vector of the vulnerability 
is located on the client-side of the web-application and the request method to 
inject or execute the code is GET.

The security risk of the non-persistent cross site vulnerability is estimated 
as medium with a cvss (common vulnerability scoring system) count of 3.4.
Exploitation of the non-persistent cross site scripting web vulnerability 
requires no privilege web application user account but low or medium user 
interaction. 
Successful exploitation of the vulnerability results in session hijacking, 
non-persistent phishing, non-persistent external redirects, non-persistent load 
of malicious script codes or non-persistent web module context manipulation.

Request Method(s):
                                [+] GET

Vulnerable Module(s):
                                [+] outgoing 

Vulnerable Parameter(s):
                                [+] url

Affected Module(s):
                                [+] src/controllers/index.js


Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers without 
privilege web-application user account and with low or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

Ubuntu 14.04 (Firefox 39.0)
Vulnerable is GET parameter --url-- in outgoing controller 
(src/controllers/index.js)

PoC:
http://www.[website].com/outgoing?url=<script>alert("CSXSS")</script>
http://www.[website].com/outgoing?url=<script>alert(document.cookie)</script>


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the url value 
parameter in the outgoing module GET method request.
Restrict the input and disallow special chars. Filter the input to prevent 
further client-side cross site scripting attacks.


Security Risk:
==============
The security risk of the client-side cross site scripting vulnerability is 
estimated as medium. (CVSS 3.4)


Credits & Authors:
==================
Mikica Ivosevic


Disclaimer & Information:
=========================
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