NodeBB 0.8.2 Cross Site Scripting

2015-09-28T00:00:00
ID PACKETSTORM:133739
Type packetstorm
Reporter Mikica Ivosevic
Modified 2015-09-28T00:00:00

Description

                                        
                                            `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:  
=========================  
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed   
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable   
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab   
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for   
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,   
policies, deface websites, hack into databases or trade with fraud/stolen material.  
  
Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com  
Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com  
Section: magazine.vulnerability-db.com - vulnerability-lab.com/contact.php - evolution-sec.com/contact  
Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab  
Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php  
Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/  
  
Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to   
electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by   
Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website   
is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact   
(admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission.  
  
Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™  
  
  
  
  
  
--   
VULNERABILITY LABORATORY - RESEARCH TEAM  
SERVICE: www.vulnerability-lab.com  
CONTACT: research@vulnerability-lab.com  
PGP KEY: http://www.vulnerability-lab.com/keys/admin@vulnerability-lab.com%280x198E9928%29.txt  
  
`