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[Ben Hollinbeck]

How to Fix Hydra Hanging or Returning False Positives

Hydra is a popular tool for brute-forcing web forms, but sometimes it may encounter problems such as hanging after a few attempts or returning all passwords as valid. In this article, we will explain why these issues happen and how to solve them.

Why does Hydra hang after attempts?

One possible reason why Hydra hangs after attempts is that the web server is blocking or throttling your requests due to excessive traffic or suspicious activity. This may cause Hydra to wait indefinitely for a response from the server, or to receive an error message that it cannot parse.

To avoid this problem, you can try the following solutions:

• Use the -t option to limit the number of concurrent tasks per server. For example, hydra -t 5 ...

• Use the -w option to set a timeout value for waiting for a response. For example, hydra -w 10 ...

• Use the -R option to restore a previous session from a file. For example, hydra -R hydra.restore ...

• Use the -C option to specify a colon-separated file with login and password pairs. For example, hydra -C logins.txt ...

• Use the -x option to generate passwords from a charset. For example, hydra -x 4:6:aA1 ...

• Use the -e option to try empty passwords or login as password. For example, hydra -e ns ...

• Use the -f option to stop on the first login/password pair found. For example, hydra -f ...

Why does Hydra return all passwords valid?

Another possible reason why Hydra returns all passwords valid is that the web form does not return a distinctive error message for invalid login attempts. This may cause Hydra to assume that any response from the server is a successful login.

To avoid this problem, you can try the following solutions:

• Use the -s option to specify the port number if it is not 80. For example, hydra -s 8080 ...

• Use the http-get-form or http-post-form service name depending on the method used by the web form. For example, hydra ... http-post-form ...

• Use the colon-separated format to specify the URL, parameters, and failure string for the web form. For example, hydra ... \"/login.php:username=^USER^&password=^PASS^:Invalid login\" ...

• Use the H= option to specify any additional headers required by the web form, such as cookies or user-agent. For example, hydra ... \"H=Cookie: PHPSESSID=1234\" ...

• Use the S= option to specify any additional strings required by the web form, such as CSRF tokens or hidden fields. For example, hydra ... \"S=token=abcd\" ...

• Use a proxy or a tool like Burp Suite to capture and analyze the requests and responses between Hydra and the web server. This can help you identify the correct parameters and failure strings for the web form.

Conclusion

Hydra is a powerful tool for brute-forcing web forms, but it may encounter some issues due to web server security measures or web form design. By using the appropriate options and parameters, you can optimize Hydra's performance and accuracy. We hope this article has helped you understand and fix some of the common problems with Hydra.

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