Book Image

Defending APIs

By : Colin Domoney
Book Image

Defending APIs

By: Colin Domoney

Overview of this book

Along with the exponential growth of API adoption comes a rise in security concerns about their implementation and inherent vulnerabilities. For those seeking comprehensive insights into building, deploying, and managing APIs as the first line of cyber defense, this book offers invaluable guidance. Written by a seasoned DevSecOps expert, Defending APIs addresses the imperative task of API security with innovative approaches and techniques designed to combat API-specific safety challenges. The initial chapters are dedicated to API building blocks, hacking APIs by exploiting vulnerabilities, and case studies of recent breaches, while the subsequent sections of the book focus on building the skills necessary for securing APIs in real-world scenarios. Guided by clear step-by-step instructions, you’ll explore offensive techniques for testing vulnerabilities, attacking, and exploiting APIs. Transitioning to defensive techniques, the book equips you with effective methods to guard against common attacks. There are plenty of case studies peppered throughout the book to help you apply the techniques you’re learning in practice, complemented by in-depth insights and a wealth of best practices for building better APIs from the ground up. By the end of this book, you’ll have the expertise to develop secure APIs and test them against various cyber threats targeting APIs.
Table of Contents (19 chapters)
1
Part 1: Foundations of API Security
6
Part 2: Attacking APIs
10
Part 3: Defending APIs

Injection attack

Injection attacks are one of the oldest and most well-known software vulnerabilities. Although originally a common defect in web applications, they are quite frequently encountered in APIs, particularly when an API accepts user-supplied input. We will cover the basics of the main injection attack types. Readers wanting more details on topics including hands-on laboratories are advised to take a look at the Further reading section in this chapter, particularly the PortSwigger resources.

Detecting injection vulnerabilities

The concept of an injection attack is extremely simple: where an API expects input data, inject one of several types of payloads and observe the behavior. For example, by passing JavaScript into a website form, can you force the website to display a message box? If so, you have found a webpage that is vulnerable to XSS attacks.

For APIs, there are numerous locations where inject payloads can be placed:

  • Query strings in the URL (for...