Barracuda Message Archiver 650 - Persistent Vulnerability

Document Title:
===============
Barracuda Message Archiver 650 - Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=743


Release Date:
=============
2013-02-27


Vulnerability Laboratory ID (VL-ID):
====================================
743


Common Vulnerability Scoring System:
====================================
3.5


Product & Service Introduction:
===============================
The Barracuda Message Archiver is a complete and affordable email archiving solution, enabling you to effectively 
index and preserve all emails, enhance operational efficiencies and enforce policies for regulatory compliance. By 
leveraging standard policies and seamless access to messages, email content is fully indexed and backed up to enable 
administrators, auditors and end users quick retrieval of any email message stored in an organization’s email archive.

    * Comprehensive archiving
    * Exchange stubbing
    * Search and retrieval
    * Policy management
    * Intelligent Storage Manager
    * Roles-based interface
    * Reporting and statistics

The Barracuda Message Archiver provides everything an organization needs to comply with government regulations in an 
easy to install and administer plug-and-play hardware solution. The Barracuda Message Archiver stores and indexes all 
email for easy search and retrieval by both regular users and third-party auditors. Backed by Energize Updates, delivered 
by Barracuda Central, the Barracuda Message Archiver receives automatic updates to its extensive library of virus, policy 
definitions to enable enhanced monitoring of compliance and corporate guidelines, document file format updates needed to 
decode content within email attachments, as well as security updates for the underlying Barracuda Message Archiver platform 
to protect against any potential security vulnerabilities.

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


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent web vulnerability in Barracudas Messsage Archiver 3.1.0.914 Appliance Application.


Vulnerability Disclosure Timeline:
==================================
2012-11-03:	Researcher Notification & Coordination
2012-11-05:	Vendor Notification
2013-01-22:	Vendor Response/Feedback
2013-02-12:	Vendor Fix/Patch
2013-02-28:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Barracuda Networks
Product: Message Archiver 650 - Appliance Application 3.1.0.914


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


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


Technical Details & Description:
================================
A persistent input validation vulnerability has been discovered in the Barracuda Networks Message Archiver 650 v3.1.0.914 Appliance Application.
The vulnerability allows remote attackers to inject own malicious script codes on the application-side of the vulnerable message archiver application.

The vulnerability is located in the vulnerable `Benutzername & Verzeichnis` (username & path) parameter values in connection with the backup module service. 
The attacker injects via POST method request own malicious script codes through the `Automated Configuration Backups` of barracuda. The execution of the code 
after the inject occurs on the application-side next to the upcoming `sock_info: Bad service` exception. 

The security risk of the bypass and persistent input validation vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) 
count of 3.5. Exploitation of the persistent web vulnerability requires low user interaction and a local privileged web-application account. Successful exploitation 
of the vulnerability can lead to persistent session hijacking (customers), account steal via persistent web attacks, persistent phishing or persistent manipulation 
of module context.

Request Method(s):
				[+] POST

Vulnerable Module(s):
				[+] Advanced > Backup Settings > Automated Configuration Backups

Vulnerable Parameter(s):
				[+] Benutzername & Verzeichnis / Pfad (Aufgrund des folgenden Fehlers: sock_info: Bad service :redisplay)


Affected Module(s):
				[+] Exception Handling - sock_info: Bad service <redisplay>


Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by local low privileged user accounts with low or medium required user inter action.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

PoC: Advanced > Backup Settings > Automated Configuration Backups

<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"><link rel="stylesheet" type="text/css" 
href="automatic_backup_test_data/barracuda.css"></head><body class="config_module" style="background-color:transparent"><br> <img 
src="automatic_backup_test_data/redball.gif" title="Test Failed"> Keine Verbindung zum FTP-Server m&#65533;glich.<br>Keine
 Verbindung zur FTP-Seite vulnerability-lab.com auf port "[PERSISTENT INJECTED SCRIPT CODE!+SAVE]"); 
Aufgrund des folgenden Fehlers: sock_info: Bad service '"[PERSISTENT INJECTED SCRIPT CODE!+SAVE]") <'<br></body></html>


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the ftp information credentials and the backsock exception output context.
Filter the inputs of the ftp module and parse + encode the output context to prevent further injection attacks.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability is estimated as medium.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team]  - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]


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