Burp Suite is one of the most popular penetration testing tools for web applications. Developed by PortSwigger, it offers a range of features that allow security testers to analyze, intercept, and modify web traffic between a browser and a target server. In this article, we will discuss how to use Burp Suite on Kali Linux, a Linux distribution specifically designed for penetration testing.

Installing Burp Suite on Kali Linux

Kali Linux, as a distribution designed for security, already includes Burp Suite Community Edition as part of its default package. To verify whether Burp Suite is installed, you can open a terminal and type the following command:

burpsuite

If Burp Suite is installed, the user interface will open. If not, you can install it with the command:

sudo apt update
sudo apt install burpsuite

Starting Burp Suite

After installation, you can start Burp Suite through the terminal with the burpsuite command. When you first run Burp Suite, you will be presented with a wizard to choose a new or existing project. Select the “Temporary Project” option to start working without saving your project settings.

Configuring Your Browser to Use Burp Suite

To take advantage of Burp Suite features like intercepting web requests, you need to configure your browser to use Burp Suite as a proxy. Here are the steps:

1. Open Proxy Settings in Browser

• In Firefox, go to Preferences > Network Settings > Settings.
• In Chrome, you can use an extension like “SwitchyOmega” to set the proxy.

2. Set Proxy to Burp Suite

• HTTP proxy: 127.0.0.1 with port 8080.
• Make sure to enable the “Use this proxy server for all protocols” option.

3. Disable Proxy for Local: Add localhost, 127.0.0.1 to the exception list.

4. Save and Close Settings

Using Burp Suite for Testing

After configuring your browser, you can start using Burp Suite to intercept and analyze HTTP requests and responses.

1. Interception

• Enable the Proxy tab in Burp Suite and click Intercept is on.
• Every HTTP request from the browser will be intercepted and displayed in this tab.

2. HTTP History: All requests that have passed through the proxy can be viewed in the HTTP history tab under Proxy.

3. Repeater: Use the Repeater tab to re-send the captured HTTP requests with certain modifications. This is useful for testing different inputs against the server.

4. Intruder: The Intruder tab is used to automate testing by sending different variations of inputs to the web application. You can use it to find security vulnerabilities such as SQL injection or XSS.

5. Scanner: The Professional version of Burp Suite has a Scanner feature that can automatically find vulnerabilities in web applications. However, this is not available in the Community Edition.

Additional Features

• Decoder: This tab allows you to decode or encode data in various formats such as Base64, URL, or HTML.

• Comparer: Used to compare two sets of data, very useful for seeing the difference in HTTP responses before and after an action.

Tips and Tricks

• Use Extensions: Burp Suite has various extensions that can be added to extend its functionality, such as the BApp Store Extender.

• SSL Certificate: If you are facing issues with HTTPS websites, install the Burp Suite certificate into your browser to prevent SSL errors.

Conclusion

Burp Suite is a very powerful tool for web application security testing. By understanding how it works in Kali Linux, you can leverage its potential to find and mitigate vulnerabilities in your web applications. Although the Community Edition has limitations, many important features are still accessible and can be used effectively. Always ensure you have the appropriate permissions before performing penetration testing to comply with the law and professional ethics.

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