Authentication Bypass - Enumerate Username via Stubly Responses - Lab #4 | Fusion Labs -

Join me as we dive into Lab 4 of the Web Security Academy to explore Authentication Bypass techniques. In this video, we’ll uncover common vulnerabilities and learn how to exploit them responsibly to strengthen our understanding of web security.
Let’s explore the Username Enumeration via Subtly Different Responses lab from the Web Security Academy. Here’s how you can approach it:

1. Visit the Login Page of the Lab:
- Start by navigating to the login page of the lab.
- You’ll need to log in with a username and password, but we’ll focus on the username enumeration part.
2. Use Burp Suite for Analysis:
- Open Burp Suite and turn on Foxy Proxy if you haven’t already.
- Enter a random username and password in the login form.
- Intercept the POST /login request in Burp Suite by going to Proxy → HTTP History.
- Look at the Response page for any indication of an invalid username.
3. Username Enumeration:
- Right-click on the request and select Send to Intruder.
- Set the attack type to Sniper.
- Use a provided username list as the payload.
- After running the enumeration, check if there are any deviations in the responses.
- Look for subtle differences in the error messages. Sometimes, minor variations exist due to typos, punctuation, or extra spaces.
- In one case, you might find that the error message is missing the full stop at the end. This indicates a valid username.
4. Brute Force Password:
- Repeat the process for the password argument until you find the correct password.
- Use a provided password list as the payload.
- Remove all responses with 2xx status codes (these indicate successful logins).
- Once you have the correct username and password combination, you’ve successfully bypassed the authentication.

Disclaimer:
This video is for educational purposes only. The techniques demonstrated are intended to be used ethically and responsibly to enhance cybersecurity knowledge and promote a safer online environment.

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