Barracuda Backup - Cross Site Scripting Vulnerability

Document Title:
===============
Barracuda Backup - Cross Site Scripting Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=799

BARRACUDA NETWORK SECURITY ID: BNSEC-1949


Release Date:
=============
2013-06-10


Vulnerability Laboratory ID (VL-ID):
====================================
799


Common Vulnerability Scoring System:
====================================
1.5


Product & Service Introduction:
===============================
Barracuda Backup Service is a complete and affordable data backup solution. The Barracuda Backup 
Server provides a full local data backup and is combined with a storage subscription to replicate 
data to two offsite locations. This approach provides the best of both worlds - onsite backups for 
fast restore times and secure, offsite storage for disaster recovery. Block level deduplication is 
applied inline to reduce traditional backup storage requirements by 20 to 50 times while also 
reducing backup windows and bandwidth requirements. Cloud Storage with Deduplication

Barracuda Backup Subscription plans provide diverse offsite storage at affordable monthly fees that 
scale to meet increasing data requirements.

    * Secure backup to two geo-separate data centers
    * Deduplicated efficient backup storage
    * Redundant disk-based storage
    * Best-of-breed data retention policies
    * Web interface multi-location management
    * Restore by Web, FTP and Windows software


(Copy of the Vendor Homepage: http://www.barracudanetworks.com/ns/products/backup_overview.php)


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a client side web vulnerability in the Barracuda Networks Backup Appliance Application.


Vulnerability Disclosure Timeline:
==================================
2012-12-27:	Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-01-07:	Vendor Notification (Barracuda Networks Security Team)
2012-01-10:	Vendor Response/Feedback (Barracuda Networks Security Team)
2012-05-02:	Vendor Fix/Patch (Barracuda Networks Developer Team)
2012-06-11:	Public Disclosure (Vulnerability Laboratory)


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


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A non persistent input validation vulnerability is detected in the Barracuda Networks Backup Appliance Application.
The bug allows remote attackers to force client side browser requests with manipulated web context or cross site requests.

The vulnerability is located in the exception-handling module of the ajax groupid_remove function when processing to load 
a manipulated date or error message context via GET. The attacker provoke the exception-handling to catch the invalid query, 
redisplays the context and execute it directly out of the exception-handling.

The vulnerability can be exploited by remote attackers without required application user account but with medium or high 
required user interaction. Successful exploitation of the vulnerability results in client side session hijacking, account 
take-over, client side phishing, client side external redirects and client side module web context manipulation.

Vulnerable Section(s):
				[+] Groups > Ajax > Call > remove_group

Vulnerable Module(s):
				[+] Exception-Handling

Vulnerable Parameter(s):
				[+] error - message context
				[+] date


Proof of Concept (PoC):
=======================
The client side cross site scripting web vulnerability can be exploited by remote attackers without privileged application user account and 
with medium or high required user interaction. For demonstration or reproduce ...

Standard (client-side) Request of a group remove ...
https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439

Provoke (client-side) Request of a group remove with exception-handling error ...
https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439-1%27

Manipulated (client-side) Request in the exception-handling of a group remove ...
https://backup1.127.0.0.1:3737/all/admin/groups/ajax/call/remove_group/group_id/12439-1%27+[CLIENT SIDE SCRIPT CODE!]


Solution - Fix & Patch:
=======================
The vulnerability can be patched by parsing the groupid remove_group function and parameter request.
Parse the exception-handling error and date values when processing to load the output after the invalid get request.

2012-05-02:	Vendor Fix/Patch (Barracuda Networks Developer Team) [COORDINATION: Dave Farrow]


Security Risk:
==============
The security risk of the client side cross site scripting web vulnerability is estimated as low.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])


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