UBNT Bug Bounty #1 - Client Side Cross Site Scripting Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
UBNT Bug Bounty #1 - Client Side Cross Site Scripting Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1465

#52988


Release Date:
=============
2015-08-17


Vulnerability Laboratory ID (VL-ID):
====================================
1465


Common Vulnerability Scoring System:
====================================
2.8


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 Research Team discovered a client-side cross site scripting web vulnerability in the 
official Ubnt 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)
2015-04-03: Vendor Response/Feedback (Ubnt Security Team - Bug Bounty Program)
2015-07-24: Vendor Fix/Patch (Ubnt Developer Team)
2015-08-12: Bug Bounty Reward (Ubnt Security Team - Bug Bounty Program)
2015-08-17: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Ubiquiti Network
Product: Ubnt Store - Web Application (Online-Service) 2015 Q2


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


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


Technical Details & Description:
================================
A non persistent cross site scripting web vulnerability has been discovered in the official Cisco Newsroom online 
service web-application.
The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions data by client-side 
manipulated cross site requests.

The vulnerability is located in the `bridgename` value of the store.ubnt.com/skin/adminhtml/default/default/media/ 
service module. The injection point 
of the issue is the vulnerable uploader.swf file. Remote attackers are able to inject own script codes to the 
vulnerable GET method request of the 
uploader.swf module.  The attack vector of the vulnerability is located on the client-side of the ubnt store 
web-application. The request method to 
inject the script code to the client-side is `GET`. The execution of the script code occurs in the same swf files 
context.

The security risk of the non-persistent input validation web vulnerability is estimated as medium with a cvss (common 
vulnerability scoring system) count of 2.8.
Exploitation of the client-side cross site scripting web vulnerability requires low user interaction (click) and no 
privileged application user account. 
Successful exploitation results in client-side account theft by hijacking, client-side phishing, client-side external 
redirects and non-persistent manipulation 
of affected or connected service modules.

Request Method(s):
                                                [+] GET

Vulnerable Service(s):
                                                [+] Ubnt Store - (store.ubnt.com/skin/adminhtml/default/default/media/)

Vulnerable Module(s):
                                                [+] uploader.swf

Vulnerable Parameter(s):
                                                [+] bridgeName


Proof of Concept (PoC):
=======================
The remote cross site vulnerability in the swf file can be exploited by remote attackers without privileged 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.

PoC: Example
string attack uploader.swf?bridgeName=1``]));}catch(s){alert('hadjisamir')}//

PoC: Payload
https://store.ubnt.com/skin/adminhtml/default/default/media/uploader.swf?bridgeName=1``]));}catch(s){alert('hadjisamir')}//Hadji
 Samir

Reference(s):
http://store.ubnt.com/ in the (uploader.swf)
http://store.ubnt.com/skin/adminhtml/default/default/media/uploader.swf?


Solution - Fix & Patch:
=======================
Encode the bridgeName value in the uploaded swf files to prevent client-side script code injection attacks or cross 
site scripting.


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerabilities in the swf file is estimated as medium. 
(CVSS 2.8)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Hadji Samir [samir () evolution-sec com]


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