Barracuda Web Filter 910 - Multiple Web Vulnerabilities

Type vulnerlab
Reporter Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve) & Pim J.F.P. Campers (X4lt)
Modified 2011-12-02T00:00:00


                                            Document Title:
Barracuda Web Filter 910 - Multiple Web Vulnerabilities

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Product & Service Introduction:
Barracuda Networks - Worldwide leader in email and Web security.
The Barracuda Web Filter is an integrated content filtering, application blocking and malware protection 
solution that is powerful, easy to use and affordable for businesses of all sizes. It enforces Internet 
usage policies by blocking access to Web sites and Internet applications that are not related to business, 
and it easily and completely eliminates spyware and other forms of malware from your organization. No more 
productivity loss trying to repair computers or make computers usable again.
Barracuda Web Filter.

    * Blocks access to Web sites based on domain, URL pattern, or content category
    * Blocks downloads based on file type
    * Blocks applications that access the Internet, including IM, music services, and software update utilities
    * Integrates with  safe search filters built into popular images search engines
    * Provides integrated gateway and desktop spyware protection

The Barracuda Web Filter combines preventative, reactive, and proactive measures to form a complete Web filtering 
solution. Designed for the enterprise, the Barracuda Web Filter enables you to set up custom policies for particular 
user and groups across customizable time ranges. The Barracuda Web Filter integrates with popular LDAP directory 
servers, such as Microsoft Active Directory, for both authentication and group membership information on which to 
apply custom policies. Sample uses of group policies include:

    * Restricting access to job board Web sites to only the Human Resources group
    * Defining separate policies for teachers and students at a school
    * Enabling compliance officers unrestricted access to the Web for investigation
    * Providing external instant messaging (e.g., AIM) access only to specific users or groups
    * Restricting personal Web browsing to non-working hours

For organizations that do not utilize directory servers, policies can be defined for unauthenticated users as a whole, 
locally defined users and groups, or network IP address ranges.

(Copy of the Vendor Homepage:

Abstract Advisory Information:
Vulnerability-Lab team discovered multiple Web Vulnerabilities on Barracudas Web Filter 910 appliance.

Vulnerability Disclosure Timeline:
2011-06-02:	Vendor Notification
2011-07-06:	Vendor Response/Feedback
2011-08-11:	Vendor Fix/Patch
2011-12-03:	Public or Non-Public Disclosure

Discovery Status:

Exploitation Technique:

Severity Level:

Technical Details & Description:
Multiple persistent Input Validation vulnerabilities are detected on Barracudas Web Filter 910. Local low privileged user accounts can
implement/inject malicious persistent script code. When exploited by an authenticated user, the identified vulnerabilities 
can lead to information disclosure, access to intranet available servers, manipulated persistent content.

						[+] Barracuda Web Filter 910

						[+] Firmware v4.3.0.011  &  older versions

Proof of Concept (PoC):
The vulnerabilities can be exploited by local low privileged user accounts or remote with high required user inter action. For demonstration or reproduce ...

Vulnerable Module(s):	
						[+] Basic/Reports - Schedule Report
						[+] Local User Search - EXCPT
						[+] Active Directory User/Group
						[+] NTLM User Search
						[+] Backup Test - Display

Manually reproduce ...
1. Login
2. Switch to the vulnerable  module of the application
3. Switch to the input fields over add & include your own script code. Save!
4. Enjoy the persistent output results


Solution - Fix & Patch:
Barracuda implemented after the issues 2011 a validation mask to filter malicious & disallowed inputs.
The barracuda firmware of the filter has been update multiple times.

Security Risk:
The security risk of the discovered vulnerabilities are estimated as high(-).

Credits & Authors:
Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve)  &  Pim J.F.P. Campers (X4lt)

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