22.2 Lab: JWT authentication bypass via flawed signature verification | 2023
This lab uses a JWT-based mechanism for handling sessions. The server is insecurely configured to accept unsigned JWTs. To solve the lab, modify your session token to gain access to the admin panel at /admin, then delete the user carlos | Karthikeyan Nagaraj
Description
This lab uses a JWT-based mechanism for handling sessions. The server is insecurely configured to accept unsigned JWTs.
To solve the lab, modify your session token to gain access to the admin panel at /admin, then delete the user carlos.
You can log in to your own account using the following credentials: wiener:peter
Solution
- Log in to your Account using
wiener:peter - Copy the Session Cookie using Cookie Editor
- Navigate to token.dev and paste the JWT cookie that you Copied
- Change the Header Values like as below
{
"type": "JWT",
"alg": "none"
}5. Change the Value of sub from wiener to administrator and Copy the JWT String (Modified Cookie)
6. Go to Lab’s page →Click on Cookie Editor → Click on the Session cookie →Paste the string that we copied → Click Save
7. Refresh the Page, Now you will be able to see the admin Panel
8. Click on the Admin panel and click delete Carlos to Solve the Lab
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Happy Hacking ~
Author: Karthikeyan Nagaraj ~ Cyberw1ngTelegram Channel for Ethical Hacking Dumps — https://t.me/ethicalhackingessentials
