Barracuda Cloud Control 3.020 Cross Site Scripting

CVE Category Price Severity
CVE-2021-27976 CWE-79 Unknown High
Author Risk Exploitation Type Date
Pablo Santiago High Remote 2018-07-19
CVSS:4.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

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):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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:

Affected Product(s):
Barracuda Networks
Product: Cloud Control Center

Exploitation Technique:

Severity Level:

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
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

PoC: Exploitation
<title>Barracuda Cloud Control v3.020 - Cross Site Scripting PoC</title>
secondary_tab=edit_user&page_submitted=550a4ef30b4d0aa5d5435c2f09b3c09c&content_only=1&target_user="><iframe src=
onload=alert("VulnerabilityLab") <

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>


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]]

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