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Ubiquiti Networks Bug Bounty #9 - Invoice Persistent Vulnerabilities

2016-02-22 15:35
Document Title:
Ubiquiti Networks Bug Bounty #9 - Invoice Persistent Vulnerabilities

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Ubiquiti Networks - airCRM - Control and Configure All Your Devices in One Interface. Provision, monitor and manage all
devices from a
central interface. Enjoy faster deployments, healthier networks & faster customer service response times.

(Copy of the Vendor Homepage: https://aircrm.ubnt.com )

Abstract Advisory Information:
An independent vulnerability laboratory researcher discovered an application-side web vulnerability in the official
Ubiquiti Networks airCRM online service web-application.

Vulnerability Disclosure Timeline:
2015-12-09: Researcher Notification & Coordination (Milan Solanki)
2015-12-23: Vendor Notification (Ubiquiti Networks Security Team - Bug Bounty Program)
2015-12-23: Vendor Response/Feedback (Ubiquiti Networks Security Team - Bug Bounty Program)
2015-12-23: Vendor Fix/Patch (Ubiquiti Networks Developer Team)
2016-02-22: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Ubiquiti Network
Product: Ubnt Community - Web Application (Online Service) 2016 Q1

Exploitation Technique:

Severity Level:

Technical Details & Description:
An application-side cross site scripting web vulnerability has been discovered in the official Ubiquiti Networks airCRM
online service web-application.
The security vulnerability allows remote attackers to inject own script code to the application-side of the affected
application module.

The vulnerabilites are located in the input Name fields in the Billing Section. Remote attackers with low privilege
web-application user accounts are
able to inject own malicious script code via POST method request. The vulnerability is located to the application-side
of the vulnerable service.

The security risk of the application-side cross site vulnerability is estimated as medium with a cvss (common
vulnerability scoring system) count of 3.8.
Exploitation of the persistent input validation web vulnerability requires a low privileged web-application user
account and low or medium user interaction.
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent
external redirects to malicious source
and persistent manipulation of affected or connected application modules.

Request Method(s):
[+] POST

Vulnerable Service(s):
[+] aircrm.ubnt.com

Vulnerable Module(s):
[+] Billings

Vulnerable Parameter(s):
[+] Business Name
[+] Residental First Name
[+] Residental Last Name

Proof of Concept (PoC):
The security vulnerability can be exploited by remote attackers with low privileged web-application user account and
low or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to

Manual steps to reproduce the vulnerability ...
1. Go to the subscriber module
2. Create with name as xss payload
Note: <--`<img/src=` onerror=alert(document.cookie)> --!>
3. Click at bottom on invoice button
4. Now, the payload directly executes and can be shared
5. Successful reproduce of the vulnerability!

Video PoC:


Solution - Fix & Patch:
The vulnerability can be patched by a secure parse and encode of the vulnerable input fields. Restrict the input and
disallow usage of special chars.
Filter and setup a secure exception handling that prevents the persistent execution in the output location.

Security Risk:
The security risk of application-side input validation web vulnerability in the frontend of the airCRM web-application
is estimated as medium. (CVSS 3.8)

Credits & Authors:
Milan Solanki - [http://www.vulnerability-lab.com/show.php?user=Milan%20A%20Solanki]

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.

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Source: 29/beF/6102/erusolcsidlluf/gro.stsilces

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