The application will now be available on your local machine at: Setting up the Demo ApplicationĪpplication setup is relatively easy, but you will need to be somewhat familiar with Ruby, Ruby on Rails, and have a basic understanding of git. This post will focus on the application’s Weak tokenizer. With the app, we can fire Burp off with abandon and see just how it analyzes the tokens. In an effort to minimize confusion, I’ve put together a small demonstration application that offers three ways simple session tokens are generated. These are values that identify a user and their current session for the purposes of authorization in a web application. One of the most popular ways random tokens are used is in session cookies. Hopefully, after reading this article you’ll have a better understanding of both. Burp Sequencer can help you understand this vulnerability and the consequences of an improper implementation. If you’ve done any work in the field, you’ve probably come across findings from some of the more popular static analysis tools that note “insecure randomness” as a vulnerability. In the simplest sense and as noted by PortSwigger’s website, it is a tool for analyzing the degree of randomness in security-critical tokens. First, let’s talk about what Sequencer actually does If you’ve been following along in the series and have a few application assessments under your belt, this is a good addition to your mental toolkit to expand your capabilities as a security analyst or penetration tester. The Sequencer tool has a lot to offer, but it is often overlooked and seen as a complex instrument to be used by only the most intelligent security engineers. This time around I wanted to draw attention to one of the more advanced features of the BurpSuite toolset, Burp’s built-in sequencer. Welcome to the next edition of the Intro to BurpSuite series.
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