Title:
======
Barracuda CudaTel 2.6.02.04 - Multiple Client Side Cross Site Vulnerabilities  (Bug Bounty #17)



Date:
=====
2013-07-17


References:
===========
http://vulnerability-lab.com/get_content.php?id=779

BARRACUDA NETWORK SECURITY ID: BNSEC-815


VL-ID:
=====
779


Common Vulnerability Scoring System:
====================================
2.5


Introduction:
=============
Designed to enable seamless voice and video communication, the CudaTel Communication Server is an easy-to-use, 
affordable, next-generation phone system for businesses. CudaTel Communication Server s enterprise-class 
feature set includes Voice over IP (VoIP) PBX services, conferencing, follow-me, automated attendant services, 
and more, controlled by an easy-to-use Web interface. CudaTel Communication Server is compatible with any SIP 
device and provider, and can be pre-configured for use with both analog and digital telephone networks. Powerful, 
Complete Solution With an expansive feature set and and no per user or phone licensing fees, the CudaTel 
Communication Server is equipped and priced for organizations of any size. Native High Definition audio support 
and integrated phone line (TDM) hardware produces an unparalleled audio experience. VOIP encryption protects calls 
from hackers and digital eavesdroppers.

(Copy of the Vendor Homepage: http://www.cudatel.com )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered multiple client side web vulnerabilities in Barracuda Networks CudaTel v2.6.002.040 appliance application.


Report-Timeline:
================
2012-11-26:  Researcher Notification & Coordination (Benjamin Kunz Mejri)
2012-11-29:  Vendor Notification (Barracuda Networks Security Team - Bug Bounty Program)
2012-12-01:  Vendor Response/Feedback (Barracuda Networks Security Team)
2013-04-07:  Vendor Fix/Patch Confirmed (Barracuda Networks Developer Team) [Manager: Dave Farrow]
2012-07-17:  Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Barracuda Networks
Product: CudaTel - Communication Server 2.6.002.040


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


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


Details:
========
Multiple client side input validation vulnerabilities are detected  in Barracuda Networks CudaTel v2.6.002.040 appliance application.
The non-persistent vulnerabilities allows an attacker (remote) to manipulate client side application to browser requests.

The first vulnerability (client side) is located in the gui route module when processing to request the vulnerable 
bbx_outbound_route_name parameter & affected listing. The route module allows remote attackers via bbx_outbound_route_flag_locked 
parameter to request and execute script codes in the bbx_outbound_route_name listing.

The secound vulnerability (client side) is located in the ajax - html module when processing to request the vulnerable 
queues_wall_stub file and the ops opOpenQueueWallboard link parameters. The vulnerability allows remote attackers (client side) 
to change the link of the Queue Monitor Board on requests to redirect.

The third vulnerability (client side) is located in the Web login attempt fail exception-handling of eventlog module when 
processing to load the manipulated bbx_eventlog_message parameter. The vulnerability allows remote attackers to execute own 
script code (client side)  in the queues_wall_stub.html file from the exception-handling location for Web login attempt fails.

Exploitation of the vulnerability requires a low privilege application user account and medium or high user interaction.
Successful exploitation of the vulnerabilities result in client side phishing, client side session hijacking, client side 
external redirects to malware or evil websites and client side module context manipulation.

Vulnerable Section(s):
        [+] GUI - ROUTE
        [+] AJAX - HTML
        [+] Eventlog

Vulnerable Module(s):
        [+] route - Listing
        [+] queues_wall_stub - Monitor Queue Link
        [+] eventlog - Web login attempt fail (Exception Handling) - Listing 

Vulnerable Parameter(s):
        [+] bbx_outbound_route_flag_locked > bbx_outbound_route_name
        [+] ops opOpenQueueWallboard
        [+] bbx_eventlog_message


Proof of Concept:
=================
The client side input validation vulnerabilities can be exploited by remote attackers without required application user account and with 
medium or high required user interaction. For demonstration or reproduce ...

1.1
Review: GUI - ROUTE > route - Listing > bbx_outbound_route_flag_locked [PARAMETER]> bbx_outbound_route_name [LISTING]
- 
bbx_domain_id: 6
bbx_outbound_route_flag_locked: 0
bbx_outbound_route_id: 14
bbx_outbound_route_name: [CLIENT-SIDE SCRIPT CODE!]
bbx_outbound_route_regex: "^\\d{10}$"
bbx_outbound_route_type: national
</pre></body></html></iframe>​​​​​</pre>


PoC:
http://cudatel.127.0.0.1:1338/gui/route/route?%3C[CLIENT-SIDE SCRIPT CODE!]%20%3C
http://cudatel.127.0.0.1:1338/gui/route/route?_=1354073910062&bbx_outbound_route_flag_locked=%3C[CLIENT-SIDE SCRIPT CODE!]%20%3C



1.2
Review: AJAX - HTML > queues_wall_stub - Monitor Queue Link > ops opOpenQueueWallboard

<h3>Queue Monitor <a class="ops opOpenQueueWallboard" href="#">Large View in New Window</a></h3>

PoC:
http://cudatel.127.0.0.1:1338/ajax-html/queues_wall_stub.html?_=1354074247075%20%3C[CLIENT-SIDE SCRIPT CODE!]%20%3C#



1.3
Review: Eventlog > eventlog - Web login attempt fail (Exception Handling) - Listing > bbx_eventlog_message
- 
    bbx_eventlog_date_time: 2012-11-26 15:25:59
    bbx_eventlog_email_sent: 0
    bbx_eventlog_fullname: Admin
    bbx_eventlog_id: 2823
    bbx_eventlog_ip_addr: 178.200.236.201
    bbx_eventlog_message: Web login attempt fail for <[x]>%20%20split%20%20"><[CLIENT-SIDE SCRIPT CODE!]") < from 178.200.236.201
    bbx_eventlog_priority: notice
    bbx_eventlog_user_agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Firefox/17.0
    bbx_user_id: 1
  - 

PoC:
http://cudatel.127.0.0.1:1338/gui/eventlog/eventlog?%3Cx%3E%20%20%20%20%22%3E%3C[CLIENT-SIDE SCRIPT CODE!]%20%3C


Reference(s):
http://cudatel.ptest.cudasvc.com/gui/route/route
http://cudatel.ptest.cudasvc.com/ajax-html/queues_wall_stub.html
http://cudatel.ptest.cudasvc.com/gui/eventlog/eventlog


Risk:
=====
The security risk of the (multiple) client side input validation vulnerabilities are estimated as medium.


Credits:
========
Vulnerability Laboratory [Research Team]  -    Benjamin Kunz Mejri (bkm@vulnerability-lab.com)


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===========
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