Description

The Organizr application allows large characters to insert in the input field “Username” which can allow attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Proof of Concept

1.Sign up to the application, capture the request in burp suites, and send it to Repeater.

2.After the &username= parameter put the payload mentioned on this link:- https://drive.google.com/file/d/1PBd3aXwKOL8uinLG7FJsn-8ldQceW4Zb/view?usp=sharing

3.Now press go and you will see the JWT token also get generated as the same size as the user input.

Video PoC

https://drive.google.com/file/d/1su5IYU3GwUBCMX6SP_Ur-u2uxXXPh6cT/view?usp=sharing