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Barracuda CudaTel - Persistent Web Vulnerability

Barracuda CudaTel - Persistent Web Vulnerability





Common Vulnerability Scoring System:

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.barracudanetworks.ca/cudatel.aspx )

The Vulnerability Laboratory Research Team discovered a client side web vulnerability in Barracuda Networks CudaTel v2.6.002.040 appliance application.

2012-11-26:	Researcher Notification & Coordination (Chokri Ben Achour)
2012-11-27:	Vendor Notification (Barracuda Networks Security Team - Bug Bounty Program)
2013-04-03:	Vendor Response/Feedback (Barracuda Networks Security Team - Bug Bounty Program)
2013-05-02:	Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordination: Dave Farrow]
2012-06-00:	Public Disclosure (Vulnerability Laboratory)


Affected Products:
Barracuda Networks
Product: CudaTel - Communication Server



The vulnerability laboratory research team discovered a persistent web vulnerability  in Barracuda Networks CudaTel v2.6.002.040 appliance application.
The input validation vulnerability allows remote attackers to inject own malicious persistent script code on application side of the vulnerable module.

The vulnerability is located in the `find me` module of the `call forwarding` function when processing to request manipulated parameters via `add listing`.
Local low privilege application user accounts can inject persistent script code to exploit higher privilege web application accounts. 

The remote bug can be exploited by remote attacker with low privileged application user account and low required userinteraction. Successful exploitation 
of the vulnerabilities result in persistent session hijacking, persistent persistent external redirects to malware or malicious sites, persistent phishing 
and persistent web context manipulation (vulnerable module).

Vulnerable Section(s):
				[+] Find Me

Vulnerable Module(s):
				[+] Call Forwarding - Add

Vulnerable Parameter(s):
				[+] Calling Sequence - Listing

Proof of Concept:

The vulnerability can be patched  by parsing the listed (output) web context after processing to add.
restrict also the input fields and disallow special chars or wrong strings.

2013-05-02:	Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordination: Dave Farrow]

The security risk of the persistent input validation vulnerability is estimated as medium.

Vulnerability Laboratory [Research Team] - Chokri Ben Achour (meister@xxxxxxxxxxxxxxxxxxxxx)

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