The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
High
AC
The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Document Title:
===============
Barracuda Networks Spam&Virus Firewall v6.0.2 (600 & Vx) - Client Side Cross Site Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=890
Barracuda Networks Security ID (BNSEC): BNSEC-1176
https://www.barracuda.com/support/knowledgebase/501600000013gvh
Solution #00006521
BNSEC-01176: Authenticated non-persistent XSS in Barracuda Spam and Virus Firewall v6.0.2
Release Date:
=============
2014-07-21
Vulnerability Laboratory ID (VL-ID):
====================================
890
Common Vulnerability Scoring System:
====================================
2.3
Product & Service Introduction:
===============================
Barracuda Networks, Inc. is a privately held company providing security, networking and storage products based on network appliances and
cloud services. The companys security products include products for protection against email, web surfing, web hackers and instant messaging
threats such as spam, spyware, trojans, and viruses. The company`s networking and storage products include web filtering, load balancing,
application delivery controllers, message archiving, NG firewalls, backup services and data protection.
(Copy of the Vendor Homepage: https://www.barracudanetworks.com/products/spamandvirusfirewall/models)
Abstract Advisory Information:
==============================
An independent researcher (Ebrahim Hegazy) discovered a client side cross site vulnerability in the Barracuda Networks Spam & Virus Firewall 5.1.0.012 Appliance.
Vulnerability Disclosure Timeline:
==================================
2013-10-26:Researcher Notification & Coordination (Ebrahim Hegazy)
2013-11-27:Vendor Notification (Barracuda Networks - Bug Bounty Team)
2013-12-03:Vendor Response/Feedback (Barracuda Networks - Bug Bounty Team)
2014-00-00:Vendor Fix/Patch (Barracuda Networks - Developer Team)
2014-00-00:Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Barracuda Networks
Product: Spam & Virus Firewall 5.1.0.012 (Model 600)
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A non persistent cross site scripting vulnerability has been discovered in the official Barracuda Networks Spam&Virus Firewall 600 v5.1.0.x Appliance Application.
The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions informaton by client-side cross site scripting requests.
The vulnerability is located in the main `index.cgi` module of the appliance. The vulnerable application GET values are `auth_type`, `primary_tab` and `secoundary_tab`.
The client-side script code execution occurs in the `index.cgi` after processing to click the client-side manipulated link with the cross site scripting payload.
The attack vector of the vulnerability is located on the client-side of the appliance service. The request method to inject the script code is `GET`.
The security risk of the non-persistent input validation web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 2.3.
Exploitation of the client-side remote vulnerability requires low or medium user interaction and no privileged application user account. Successful exploitation results
in client-side account theft by hijacking, client-side phishing, client-side external redirects and non-persistent manipulation of appliance application- or connected modules.
Vulnerable Service(s):
[+] Barracuda Networks - Spam & Virus Firewall 600 v5.1.0.x [BUG BOUNTY: http://spam.ptest.cudasvc.com]
Vulnerable Module(s):
[+] ../cgi-mod/index.cgi
Vulnerable Parameter(s):
[+] auth_type
[+] primary_tab
[+] secondary_tab
Affected Section(s):
[+] Index - Tab Listings
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 low or medium user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information
and steps below to continue.
Service: Bug Bounty Server (ptest)
Seriennummer: #BAR-SF-362525
Firmware: v5.1.0.012 (2011-10-27 11:34:08)
Modell:V600
1- primary_tab
2- auth_type
3- secondary_tab
PoC: Service Link with client-side injected Payload
http://spam.ptest.cudasvc.com/cgi-mod/index.cgi?primary_tab=1%27-alert%28document.location%29-%27//&secondary_tab=quarantine_setup&realm=
%0D&auth_type=Local&user=guest&password=0dc15354daf5236353adf547cf675a49&et=1361818196&role=%0D&locale=en_US&q=
%0D&UPDATE_scana_per_user=Yes&save=Save+Changes&UPDATE_scana_quarantine_addr=fdhdf&UPDATE_scana_quarantine_tag=[QUAR]
&UPDATE_scana_quarantine_reply_addr=postmaster@barracudanetworks.com&UPDATE_quarantine_inbox_url=
%0D&UPDATE_quarantine_enable_default=No&UPDATE_scana_use_default_domain=No&UPDATE_scana_quarantine_notify=Daily&UPDATE_notification_time=15%3
a35&UPDATE_outbound_dusage_use_size_limit=No&UPDATE_outbound_dusage_size_limit=1024000&UPDATE_outbound_dusage_use_age_limit=Yes&UPDATE_outbou
nd_dusage_age_limit=30&UPDATE_user_quarantine_notify=Never&UPDATE_outbound_notification_time=15%3a35&UPDATE_user_quarantine_email_address=%0D
Solution - Fix & Patch:
=======================
The vulnerable function and script context should be filtered when processing to encode meta characters in client-side user inputs.
Especially when the context will be prepared to reflect inside of the main page index.cgi context.
Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerabilities are estimated as medium(-).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Ebrahim Hegazy [[email protected]] (www.vulnerability-lab.com)
Disclaimer & Information:
=========================
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