Book Image

Fuzzing Against the Machine

By : Antonio Nappa, Eduardo Blázquez
Book Image

Fuzzing Against the Machine

By: Antonio Nappa, Eduardo Blázquez

Overview of this book

Emulation and fuzzing are among the many techniques that can be used to improve cybersecurity; however, utilizing these efficiently can be tricky. Fuzzing Against the Machine is your hands-on guide to understanding how these powerful tools and techniques work. Using a variety of real-world use cases and practical examples, this book helps you grasp the fundamental concepts of fuzzing and emulation along with advanced vulnerability research, providing you with the tools and skills needed to find security flaws in your software. The book begins by introducing you to two open source fuzzer engines: QEMU, which allows you to run software for whatever architecture you can think of, and American fuzzy lop (AFL) and its improved version AFL++. You’ll learn to combine these powerful tools to create your own emulation and fuzzing environment and then use it to discover vulnerabilities in various systems, such as iOS, Android, and Samsung's Mobile Baseband software, Shannon. After reading the introductions and setting up your environment, you’ll be able to dive into whichever chapter you want, although the topics gradually become more advanced as the book progresses. By the end of this book, you’ll have gained the skills, knowledge, and practice required to find flaws in any firmware by emulating and fuzzing it with QEMU and several fuzzing engines.
Table of Contents (18 chapters)
Part 1: Foundations
Part 2: Emulation and Fuzzing
Part 3: Advanced Concepts
Chapter 12: Conclusion and Final Remarks

QEMU user mode

QEMU is a very versatile tool that allows us to run binaries from other architectures without installing any virtualization mechanisms or running the emulation of the whole target system. In this part of the chapter, we will learn how to run QEMU in user mode, how to create binaries for other architectures, and how to debug them using the common tools that a Linux system offers us: gcc and gdb.

The first thing we will do now is install all the necessary tooling for this part of the chapter. While in some cases, not every package is necessary for what we’ll do, you can choose the architecture you want. In our case, and in this part of the book, we will work on binaries for the ARM architecture (

Let’s first see the commands we will run for installing the tooling for ARM:

sudo apt install build-essential # for all the other packages of compilation utilities
sudo apt install gcc-arm-linux-gnueabihf...