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

Business logic vulnerabilities

The final category of vulnerability is that of business logic vulnerabilities, which allow an attacker to elicit unexpected behaviors with negative consequences. They are closely aligned with abuse cases and can be notoriously difficult to eliminate. The key is to think like an adversary—threat modeling exercises can be useful in highlighting business logic vulnerabilities.

There are several good examples of business logic vulnerabilities affecting APIs:

  • Relying on client-side controls: One of the most nefarious and persistent weaknesses (highlighted frequently in this chapter) is the reliance on client-side controls to implement security. Simply put, they do not work and can always be defeated—do not use them.
  • Trusting users: Avoid trusting that the user will behave in the way you intended; typical examples include not providing required parameters or supplying the wrong format of data.
  • Trusting partners and third parties...