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Burp Suite Essentials
Burp Suite Essentials

Burp Suite Essentials: Discover the secrets of web application pentesting using Burp Suite, the best tool for the job

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Burp Suite Essentials

Chapter 1. Getting Started with Burp

Burp Suite is a collection of tightly integrated tools that allow effective security testing of modern-day web applications. It provides a great combination of tools that allow automated and manual workflows to test, assess, and attack web applications of all shapes and sizes. Getting started with Burp is easy. With some application, we can become extremely comfortable and skilled at using the various powerful tools that are offered by Burp Suite.

Burp Suite is a piece of modern software written in the Java language. Java makes it cross-platform and extremely versatile for use both by novices and professionals. This chapter will get you started with Burp quickly while giving you enough information that will facilitate our journey of getting acquainted with Burp Suite. The tool, unlike point-and-click automated scanners, is meant to be used in a hands-on manner, and while it makes it easy to automate parts of the testing, a lot can be done by the tool in the hands of an expert. Since our aim is to optimize the way we use Burp, through this chapter, we will get to know a few tricks that will make it easy to start with.

Burp Suite is distributed as a single Java Archive (.jar) file. The free version can be downloaded from http://portswigger.net/burp/downloadfree.html. There is no registration or form to fill out, but if you'd rather get the Pro version, which I highly recommend, then you need to buy it from the same website to be able to download it. There are significant differences between the free version and the Pro version, but if you are a serious tester looking for the best value-for-money scanner / web application security tool, it should be Burp Suite Pro.

The main differences between the free version and the Pro version of Burp Suite are:

  • Burp Scanner
  • The ability to save and restore your work
  • Engagement tools, such as Target Analyzer, Content Discovery, and Task Scheduler

These are the topics we'll be covering in this chapter:

  • Starting Burp from the command line
  • Setting memory options based on our requirement and system RAM
  • Troubleshooting any IPv6 error that occurs sometimes

Oracle Java 1.6 or above is currently required for the software to run.

Oracle Java 1.6+ is usually installed for Windows and Mac OS X. If your computer doesn't have it installed, go to http://java.com, choose the version of Java Runtime Environment (JRE) for your operating system, and follow the installation instructions.

The official documentation cautions users from double-clicking on the .jar file. This is to ensure that we can clearly specify the amount of RAM allocated for the Burp process when we start it.

Some people have successfully run Burp with other flavors of Java, but for now, we will focus on running it well with Oracle Java 1.6 or above.

Starting Burp from the command line

Burp doesn't have an elaborate setup process. Starting Burp is as simple as executing a command in your shell of choice.

Starting Burp requires Java to be already installed and configured on your computer. If your computer doesn't already have Java 1.6+, you can get it for free from http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html.

We need the JRE, so click on the Download button under JRE.

If your computer already has Java 1.6 or above installed, execute the following in your shell:

java -jar /path/to/burpSuite.jar

Those who have done Java programming will understand what is happening here. We are passing a JAR to the Java runtime. Please note there are no command-line options that need to be passed to Burp Suite.

Specifying memory size for Burp

If we start Burp Suite by double-clicking on the .jar file, the Java runtime will allocate the maximum memory available to Burp on its own. The total amount allocated might vary based on the available system RAM. Since Burp Suite will capture hundreds and sometimes thousands of requests and responses of various sizes, it makes sense to allocate memory when we start the program.

There is the possibility that Burp Suite might crash if the total memory available is not enough. While doing a security assessment, we don't want to worry about disruption in our work or the feeling that we may lose valuable data about the assessment due to Burp Suite crashing. Therefore, it is prudent to specify how much system RAM is allocated to Burp Suite in the beginning itself.

Specifying the maximum memory Burp is allowed to use

We can use command-line flags provided by Java to ensure that Burp has enough, and more, memory to use while running our security assessment:

java -jar -Xmx2048M /path/to/burpsuite.jar
java -jar -Xmx2G /path/to/burpsuite.jar

Both these commands will allocate 2 GB of RAM to Burp Suite. We can also pass options for gigabytes, megabytes, or kilobytes. You can read up more about this at the Oracle page at http://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionX.html#wp999528.

This should be enough for most web applications that need to be tested. If you have more system RAM to spare, you can even increase it further. There is a small caveat you should know. If you increase the memory allocated to Burp Suite beyond 4 GB, the Java Virtual Machine (JVM) garbage collector (GC) will need to do more work. This has been known to adversely affect the performance of Java-based applications. Keeping that in mind, there are clear performance gains that can be achieved by increasing the minimum heap size from the default, which can be as low as 128 MB on older machines.

Ensuring that IPv4 is allowed

Sometimes, Java picks up the IPv6 address on the interface, and Burp is unable to make any connections to websites returning an IPv4 address. This results in a Java error, which is as follows:

java.net.SocketException: Permission denied

The browser also shows a cryptic error, which is as follows:

Burp proxy error: Permission denied: connect

If we ever encounter this error, all we need to do is tell Java that we want to use the IPv4 interface by passing the following parameter to the runtime:

java -Xmx2048M -Djava.net.preferIPv4Stack=true -jar /path/to/burpsuite.jar

This command and flag tells the Java runtime that we will prefer the IPv4 network stack to run the Burp Suite JAR file. Another option is to set a Java option environment variable.

Please note that by running the preceding command, the IPv6 interface will be disabled.

Many people have reported this as a bug on the Burp support forums. Most of the people who complained were using Microsoft Windows 7 64-bit operating system running a 32-bit version of the JVM.

Working with other JVMs

The official documentation of Burp doesn't say anything about not working with JVMs apart from the official Oracle Java. There was a time when if we tried to run Burp Suite with OpenJDK, it would start off by giving a warning. But now, it runs perfectly without any warnings in Kali with OpenJDK.

Kali is a Linux-based distribution that has been specifically created for penetration testing and security testing of applications and networks. Previously, it was known as Backtrack. In the following screenshot, we can see that it runs the OpenJDK JRE and is able to run Burp Suite without any issues:

Working with other JVMs

Summary

We have successfully managed to start Burp Suite. Usually, we just double-click on the application shortcut and get it working. However, if you want to utilize the full power of the application, we need to understand some of the underlying concepts of memory and networking.

In this chapter, you learned how to allocate and reserve a specified amount of RAM for use while Burp Suite runs. This will ensure that while doing a security assessment, memory issues will not hamper our progress in any way. We also saw an error that can crop up, which is quite difficult to understand unless you have seen it before.

Now that we have successfully started Burp Suite, in the next chapter, we will see how to configure our web browsers to send web traffic through it for interception and analysis.

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Description

If you are interested in learning how to test web applications and the web part of mobile applications using Burp, then this is the book for you. It is specifically designed to meet your needs if you have basic experience in using Burp and are now aiming to become a professional Burp user.

What you will learn

  • Get to grips with the userdriven workflow so that you can test any kind of web application
  • Get acquainted with the use of each of the components in Burpa?”Target, Proxy, Intruder, Scanner, and Repeater
  • Search, extract, and match patterns for requests and responses using response extraction rules, URLmatching rules, and Grep Match
  • Set up and test SSLenabled applications without any errors
  • Intercept SSL traffic from all kinds of web and mobile applications
  • Develop customized Burp Extensions to suit your needs using Java, Python, and Ruby
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Table of Contents

12 Chapters
1. Getting Started with Burp Chevron down icon Chevron up icon
2. Configuring Browsers to Proxy through Burp Chevron down icon Chevron up icon
3. Setting the Scope and Dealing with Upstream Proxies Chevron down icon Chevron up icon
4. SSL and Other Advanced Settings Chevron down icon Chevron up icon
5. Using Burp Tools As a Power User – Part 1 Chevron down icon Chevron up icon
6. Using Burp Tools As a Power User – Part 2 Chevron down icon Chevron up icon
7. Searching, Extracting, Pattern Matching, and More Chevron down icon Chevron up icon
8. Using Engagement Tools and Other Utilities Chevron down icon Chevron up icon
9. Using Burp Extensions and Writing Your Own Chevron down icon Chevron up icon
10. Saving Securely, Backing Up, and Other Maintenance Activities Chevron down icon Chevron up icon
11. Resources, References, and Links Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.2
(15 Ratings)
5 star 60%
4 star 6.7%
3 star 26.7%
2 star 6.7%
1 star 0%
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Vivek Mohan Aug 07, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I would highly recommend this book for anyone getting started with Burp Suite, and web application security testing. Extremely well written, this book systematically covers the essentials of the tool, right from configuration to using Burp Suite as a power user. A must have in your library.
Amazon Verified review Amazon
Michael F. Sterrett Mar 21, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Burp Suite Essentials guides you through initial setup/configuration of Burp Suite through becoming a power user. A must read for anybody wanting to use Burp Suite for pentesting or CTF competitions.
Amazon Verified review Amazon
hemanthkumar Mar 13, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Awesome
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Amazon Customer Dec 05, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good book
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David Harshman May 07, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent
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