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

Triforce’s driver mod for iOS

Now that we have shown you how to start the fuzzer and exactly when the system starts, we will run the binary called sysc_fuzz, according to the .plist file edited in the Plist files and entitlements section. We are now going to explain what the function of this binary is, which glues AFL together, and the system call interface of iOS.

We have taken the code from the TriforceLinuxSyscallFuzzer driver (check out the OpenWrt chapters to get a refresher on the concept) repository and adapted it to iOS. The compilation has been done on a Mac, although it is possible to do it on a Linux machine. We are not going to show you how to compile the sysc_fuzz binary on Linux though while given all the source code involved. The reason for this decision is that the process becomes painful on Linux, since it requires downloading Xcode Command Line Tools and registering an Apple account. However, there are many tutorials online (