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

Authorization attacks

We now have a thorough understanding of the wide array of attacks that can be used on the authentication mechanisms of an API. Let us now turn the focus to the counterpart of authentication: authorization.

Object-level authorization

As a reminder, broken object-level authorization (BOLA) occurs when an API becomes confused about the right to access an object and allows unauthorized access. In Chapter 3, Understanding Common API Vulnerabilities, this is covered in detail in the API1:2019 — Broken object-level authorization section.

Conceptually speaking, BOLA attacks are simple to originate using the following recipe:

  1. Identify an API operation that takes an object ID as a parameter.
  2. Create a resource for the first user (call them user A).
  3. Confirm that user A can access the new resource.
  4. Using a second user (call them user B) who does not have access to the new resource, attempt to access the same resource. If you succeed, you...