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Cluster bomb - Username enumeration via account lock

Samuel | Last updated: Jul 10, 2022 05:06PM UTC

Hi, Currently working on lab "Vulnerabilities in password-based login - Username enumeration via account lock", and after sending cluster bomb attack, there is no length variation for valid account. Even I divided in chunks of 20 the recommended list of usernames. Is something wrong with this lab ?

Michelle, PortSwigger Agent | Last updated: Jul 11, 2022 03:15PM UTC

Hi We've checked the lab and on steps 3 and 4 of the solution, we are seeing a difference in the length for two of the responses. Have you tried following along with the video solution provided by one of our users in the community?

RAMSHATH | Last updated: Nov 15, 2022 05:50AM UTC

Tried the same method shown in the video but was not able to get a different length variation.

Michelle, PortSwigger Agent | Last updated: Nov 15, 2022 08:31AM UTC

Hi Can you tell us a bit more about the steps you took? Are you using Burp Suite Community or Burp Suite Professional? How many usernames and passwords did you include in the attack at a time?

Rico | Last updated: Nov 27, 2022 04:32PM UTC

Please help me understand the logic of this lab. I passed it, but I don't understand one thing, that I entered all the passwords and even after the inscription that the account is blocked, I was able to log in safely.

Michelle, PortSwigger Agent | Last updated: Nov 28, 2022 11:10AM UTC

The resource materials should give you a bit more background on this type of vulnerability, there's a section that discusses account-locking on this page: https://portswigger.net/web-security/authentication/password-based I hope this helps.

Marwa | Last updated: Dec 31, 2022 03:09PM UTC

Hi, thank you in advance for your help! Is there a difference if we use Burp community VS burp professional? I have followed along with the steps, and I am stuck in enumerating the valid username. I have hit the POST /login with the Cluster mode attack type. The first payload is the username (list of candidate usernames, including "ae", and for the password, null payload as indicated, 5 times: username=§hello§&password=12345§§ This line above is to show that I paid attention to setting the null payload. I do not see a difference in the length in any of the response for any username, including ae. I did wait for a couple minutes before re launching the attack. Could you please help here? Thanks

Ben, PortSwigger Agent | Last updated: Jan 02, 2023 10:42AM UTC