DVWA Login Brute Force with Hydra

G5 Cyber Security

2 weeks ago

TL;DR

This guide shows you how to brute-force the DVWA login page using the Hydra tool. It’s for learning purposes only – never use this against systems you don’t have permission to test.

Prerequisites

A running instance of DVWA (Damn Vulnerable Web Application).
Hydra installed on your Kali Linux machine or similar. You can install it with:
```
sudo apt update && sudo apt install hydra
```
A wordlist containing potential usernames and passwords (e.g., rockyou.txt).

Steps

Find the Login Form Details
- Open your web browser’s developer tools (usually by pressing F12).
- Navigate to the DVWA login page.
- Inspect the HTML source code of the login form.
- Identify the names of the username and password fields. Commonly, these are ‘username’ and ‘password’.
Basic Hydra Command
The basic syntax for a brute-force attack using Hydra is:
```
hydra -l  -P   http-post-form "/login.php:username=:password="
```
- -l: Specifies the username to use (or leave blank for multiple usernames).
- -P: Specifies the path to your wordlist file.
- : The URL of the DVWA login page (e.g., 192.168.1.100).
- http-post-form: Indicates that you’re using an HTTP POST form for authentication.
- “/login.php:username=:password=“: Specifies the login page and the names of the username and password fields found in Step 1. Replace and with the actual field names.
Example Command (Single Username)
Assuming your DVWA URL is 192.168.1.100, username field is ‘username’, password field is ‘password’, and you want to try the username ‘admin’ with rockyou.txt:
```
hydra -l admin -P /usr/share/wordlists/rockyou.txt 192.168.1.100 http-post-form "/login.php:username=username:password=password"
```

Example Command (Multiple Usernames)

To try multiple usernames from a wordlist, leave the -l option blank:

hydra -P /usr/share/wordlists/rockyou.txt 192.168.1.100 http-post-form "/login.php:username=username:password=password"

Monitor the Output
Hydra will display its progress as it tries different username and password combinations. Look for lines that indicate a successful login:
```
[STATUS] 192.168.1.100:443 - login: admin Password: password
```
Adjusting Hydra Options (Optional)
- -t : Specifies the number of threads to use for faster brute-forcing. Be careful not to overload the server. Example:
```
hydra -t 16 ...
```
- -vV: Increases verbosity for more detailed output.

Important Considerations

Rate Limiting and Account Lockout: DVWA may implement rate limiting or account lockout mechanisms, which can hinder your brute-force attempt.
Wordlist Quality: The effectiveness of the attack depends heavily on the quality of your wordlist. Use a comprehensive wordlist like rockyou.txt.
Ethical Hacking: Only perform this test on systems you have explicit permission to assess. Unauthorized access is illegal and unethical.