UBNT Script Insertion

`Document Title:  
===============  
UBNT Bug Bounty #3 - Persistent Filename Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1467  
  
Video: http://www.vulnerability-lab.com/get_content.php?id=1468  
  
  
Release Date:  
=============  
2015-08-11  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1467  
  
  
Common Vulnerability Scoring System:  
====================================  
4.2  
  
  
Product & Service Introduction:  
===============================  
Ubiquiti Networks is an American technology company started in 2005. Based in San Jose, California they are a manufacturer of   
wireless products whose primary focus is on under-served and emerging markets.  
  
(Copy of the Homepage: http://en.wikipedia.org/wiki/Ubiquiti_Networks )  
  
  
Abstract Advisory Information:  
==============================  
The Vulnerability Laboratory Core Research Team discovered an application-side input validation web vulnerability in the official Ubiquiti Networks Community online service web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2015-03-17: Researcher Notification & Coordination (Hadji Samir)  
2015-03-18: Vendor Notification (Ubnt Security Team - Bug Bounty Program)  
2015-04-12: Vendor Response/Feedback (Ubnt Security Team - Bug Bounty Program)  
2015-07-09: Vendor Fix/Patch (Ubnt Developer Team)  
2015-08-11: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Ubiquiti Network  
Product: Ubnt Community - Web Application (Online Service) 2015 Q2  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Medium  
  
  
Technical Details & Description:  
================================  
An application-side web vulnerability has been discovered in the official Ubiquiti Networks Community online service web-application.  
The vulnerability allows an remote attacker to inject own script code to the application-side of the affected application module.  
  
The web vulnerability is located in the `filename` value of the `gallery page album upload` module. Remote attackers are able to inject own files   
with malicious `filename` value in the `album upload` POST method request to compromise the ubnt web-application. Remote attackers are also able   
to exploit the filename issue in combination with persistent injected script codes to execute different malicious attack requests. The attack vector   
is located on the application-side of the ubnt service and the request method to inject is POST.   
  
The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 4.2.   
Exploitation of the application-side validation web vulnerability requires no user interaction and only a low privileged web-application user account.   
Successful exploitation of the security vulnerability results in the ubnt community web-application compromise.  
  
Request Method(s):  
[+] [POST]  
  
Vulnerable Module(s):  
[+] gallerypage (upload)  
  
Vulnerable Parameter(s):  
[+] filename (Album)  
  
Affected Module(s):  
[+] confirmationpage  
  
  
Proof of Concept (PoC):  
=======================  
The vulnerability can be exploited by remote attackers with low privileged application user account and with low user interaction.   
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.  
  
Manual steps to reproduce the vulnerability ...  
1. Open link http://community.ubnt.com/t5/media/gallerypage  
2. Click add images  
3. Upload image with name "><img src="x" onerror=alert(document.cookie)>.png  
4. Click selact an album and save  
5. Post comment  
6. Click selete the comment you will redirect to http://community.ubnt.com/t5/action/confirmationpage  
7. Now you will see the alert with the document cookies context!  
  
PoC Video: http://www.vulnerability-lab.com/get_content.php?id=1468  
  
  
Reference(s):  
http://community.ubnt.com/  
http://community.ubnt.com/t5/media/gallerypage  
http://community.ubnt.com/t5/action/confirmationpage  
  
  
Solution - Fix & Patch:  
=======================  
The vulnerability can be patched by a secure parse and encode of the vulnerable filename value in the album add module.  
Restrict the input and encode the filename to prevent further script code injection attack that runs through the application-side.  
Disallow special chars and implement a secure exception to prevent the execution itself.  
  
  
Security Risk:  
==============  
The security risk of the application-side album filename input validation web vulnerability is estimated as medium. (CVSS 4.2)  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Hadji Samir [[email protected]]  
  
  
Disclaimer & Information:  
=========================  
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