Document Title:
===============
Barracuda Bug Bounty #9 CT - Cross Site Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=577
Barracuda Networks Security ID: BNSEC-305
Release Date:
=============
2013-05-09
Vulnerability Laboratory ID (VL-ID):
====================================
577
Common Vulnerability Scoring System:
====================================
2.4
Product & Service 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 or http://www.barracudanetworks.com )
Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered multiple client side Web Vulnerabilities in the official Barracuda CudaTel Communication Server, Firmware 2.5.001.016.
Vulnerability Disclosure Timeline:
==================================
2013-01-04: Fix/Patch by Barracuda Networks
2013-05-09: Public Disclosure
Discovery Status:
=================
Published
Affected Product(s):
====================
Barracuda Networks
Product: CudaTel - Communication Server 2.5.001.016
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Low
Technical Details & Description:
================================
Multiple non-persistent input validation vulnerabilities are detected in the official Barracuda CudaTel Communication Server, Firmware 2.5.001.016.
The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions with medium or high required user interaction.
The first vulnerability is located in the exception handling when processing to load invalid integer values by using the list
or bbx_backup_site_id parameters. The second client side cross site scripting vulnerability is located in the list module when processing
to load the showname parameter.
Exploitation of the vulnerability does not require an application user account but low or medium user interaction.
Successful exploitation of the vulnerability result in account steal, client-side phishing & client-side module context request manipulation.
Vulnerable Module(s)
[+] Exception Handling Integer Value - List or bbx_backup_site_id
[+] List - showname
Proof of Concept (PoC):
=======================
The non-persistent cross site scripting vulnerabilities can be exploited by remote attackers with medium or high required user inter action and
without local application user account. For demonstration or reproduce ...
Code Review: Exception Handling Integer Value - List or bbx_backup_site_id
<pre>---
ERROR: invalid input syntax for integer: >``<[NON-PERSISTENT SCRIPT CODE!]>`` .... with
ParamValues: 1='>``<[NON-PERSISTENT SCRIPT CODE!]>'] at /home/bps/code/firmware/current/lib/perl5//Barracuda/
BPS/BaseResultSet.pm line 217"
</pre>
PoC:
cudatel.127.0.0.1:8080/gui/backup/list?_=1337378392621&bbx_backup_site_id='<[NON-PERSISTENT SCRIPT CODE!]>&bbx_backup_site_type=x&bbx_backup_site_host=x
Code Review: List - showname
bbx_domain_id: 6
bbx_extension_block_begin: 2040
bbx_extension_block_end: 2040
bbx_extension_id: 153
bbx_extension_id_primary: 153
bbx_extension_rcd: 2012-05-03 19:48:41.6751
bbx_extension_rpd: 2012-05-03 19:48:41.70055
bbx_extension_value: 2040
bbx_router_id: 30
flag_auto_provision: 0
flag_external: 0
flag_locked: 0
flag_primary: 1
flag_standalone: 1
flag_super: 0
flag_voicemail: 0
show_name: ">``<"<[NON-PERSISTENT SCRIPT CODE!]>']"' sort_name:="" "="">``<"<[NON-PERSISTENT SCRIPT CODE!]>']")<"
type: router
PoC:
cudatel2.127.0.0.1:8080/gui/extension/list?_=1337415353739&rows=1000&sortby='<[NON-PERSISTENT SCRIPT CODE!]>
Solution - Fix & Patch:
=======================
The show-name & the integer name needs a secure encoding to parse manipulated malicious client side request via GET method.
The output listing (show-name & invalid integer error name) needs to be parsed too.
Note: The issue has been addressed (fixed) by barracuda networks since January 2013 after the report in 2012.
Security Risk:
==============
The security risk of the cross site scripting vulnerabilities are estimated as medium(-).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)
Disclaimer & Information:
=========================
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