Use the Search Functionality in Burp Suite

Introduction

Burp Suite is a powerful platform for web application security testing. One of its most useful features is the global search function, which allows you to quickly find specific content across all of its different tools, such as Proxy, Repeater, and Intruder. This is incredibly helpful for locating specific parameters, tokens, error messages, or other interesting strings within the vast amount of data captured during a security assessment.

In this lab, you will learn how to effectively use the search functionality in Burp Suite. You will practice opening the search dialog, defining a search term, configuring search options, and analyzing the results.

Go to the 'Burp' Menu and Select 'Search'

In this step, you will begin by launching Burp Suite and opening the global search window. This window is the central hub for all search-related activities within the application.

First, you need to launch Burp Suite. You can find it in the application menu. Click on the Applications menu in the top-left corner, go to Other, and select Burp Suite Community Edition.

A dialog box will appear. Just click Next and then Start Burp to open the main application window.

Once Burp Suite is running, locate the main menu bar at the very top of the window. Click on the Burp menu. A dropdown list will appear. From this list, select Search.

This action will open the global search dialog window. You will use this window in the following steps to perform your searches.

Enter a Search Term (e.g., a specific parameter name)

In this step, you will enter a search term. Before we can search for anything meaningful, we need to generate some web traffic data within Burp Suite.

First, let's configure Burp's proxy and use its built-in browser to visit a website.

1. Go to the Proxy tab and then the Intercept sub-tab.
2. If the button says Intercept is on, click it to turn it off. It should now say Intercept is off.
3. Click the Open Browser button. A new Chromium browser window will open, pre-configured to send traffic through Burp Suite.
4. In the browser's address bar, type http://portswigger-labs.net and press Enter. Browse the site for a moment.
5. You can now close the browser window.

Go back to the Burp Suite window. Navigate to the Proxy -> HTTP history tab. You will see a list of requests that your browser made. This is the data we will search through.

Now, return to the search window you opened in the previous step (or open it again via Burp -> Search). In the Search term input field, we will look for a common HTTP header. Type the following term into the search box:

Host

This is the term we will be looking for in the subsequent steps.

Configure the Search Options (e.g., case-sensitive, regex)

In this step, you will learn how to refine your search using the available options. The search window provides several checkboxes to control the search behavior.

Below the Search term field, you will find these options. Let's explore two of the most common ones:

• Case sensitive: When this box is checked, the search will only find text that matches the exact casing of your search term. For our search for Host, checking this would find Host but not host or HOST.
• Regex: This powerful option treats your search term as a regular expression. This allows for advanced pattern matching. For example, to find a parameter that looks like a session ID (e.g., sessionid=a1b2c3d4), you could use a regex like sessionid=\w+.

For this lab, we want to perform a case-sensitive search to find the specific HTTP header.

Ensure the Case sensitive checkbox is ticked. Leave the Regex checkbox unticked for now.

Select the Tools to Search In (e.g., Proxy, Repeater)

In this step, you will define the scope of your search. Burp Suite allows you to select which of its tools should be included in the search operation.

On the right side of the search window, you will see the Tools scope section. This area lists all the major tools in Burp Suite, such as Target, Proxy, Repeater, and Intruder.

Since we generated traffic using the built-in browser, all the requests and responses are stored in the Proxy history. Therefore, we need to make sure our search includes the Proxy tool.

Ensure that the Proxy checkbox is ticked. To make the search faster and more focused, you can untick the other checkboxes like Target, Repeater, etc. For this lab, searching only within the Proxy is sufficient.

Execute the Search and Analyze the Results

In this step, you will execute the search and analyze the results. With all the parameters configured, you are now ready to find all occurrences of the Host header.

At the bottom of the search window, click the Search button.

The search will run, and the results will appear in the table in the main part of the window. Each row in the table represents a single match found in the specified tool scope. The table columns provide context for each match, including the Tool, Host, Method, and URL.

To inspect a specific match:

1. Click on any row in the results table.
2. Look at the Request / Response viewer at the bottom. You will see the full request and response for the selected item.
3. The search term, Host, will be automatically highlighted in the request viewer, making it very easy to see the match in its context.

This functionality is extremely valuable for quickly navigating through hundreds or thousands of transactions to find specific points of interest.

Summary

In this lab, you have successfully learned how to use the global search functionality in Burp Suite. You practiced opening the search dialog, entering a search term, configuring options like case sensitivity, selecting the tool scope, and finally, executing the search and analyzing the results.

Mastering the search feature is a key skill for efficient web application security testing, saving you significant time and effort when analyzing large and complex applications. You can now apply this skill to find vulnerabilities, track user sessions, or locate any piece of information within your testing traffic.