The downside to IDA Pro is that it costs $515 US for the standard single-user edition. Commercial Windows Disassemblers IDA Pro is a professional disassembler that is expensive, extremely powerful, and has a whole slew of features. The site is currently in beta release but will hopefully only get better with time. You can use "Live View" to see how code is disassembled in real time, one byte at a time, or upload a file. Online Disassemblers ODA is a free, web-based disassembler for a wide variety of architectures. Each disassembler will have different features, so it is up to you as the reader to determine which tools you prefer to use. Notice that there are professional disassemblers (which cost money for a license) and there are freeware/shareware disassemblers. Here we are going to list some commonly available disassembler tools. We will typically not use HLA syntax for code examples, but that may change in the future. Examples in this book will use Intel and AT&T syntax interchangeably. Many disassemblers have the option to output assembly language instructions in Intel, AT&T, or (occasionally) HLA syntax. Of course, disassembly has its own problems and pitfalls, and they are covered later in this chapter. Since most assembly languages have a one-to-one correspondence with underlying machine instructions, the process of disassembly is relatively straight-forward, and a basic disassembler can often be implemented simply by reading in bytes, and performing a table lookup. Where an assembler converts code written in an assembly language into binary machine code, a disassembler reverses the process and attempts to recreate the assembly code from the binary machine code. In essence, a disassembler is the exact opposite of an assembler. Wikipedia has related information at Disassembler 5.1.2 parameters after the call instruction.5.1.1 jump tables and other calculated jumps.2.3 Commercial Freeware/Shareware Windows Disassemblers.We are going to perform this entire exercise as a black box attack. Please only download the dontpopme binary and NOT the source code. Step 1: Download the vulnerable binary from my GitHub page In order for you to follow this walkthrough step-by-step, make sure you have your jailbroken phone ready with SSH / SFTP set up and connected on the same LAN. Your jailbroken iPhone (I am using an old phone with iOS 14.1).These are the tools we will use to perform the analysis: Find the next function we want to use for ROP chain.Calculate the function addresses at runtime (ASLR enabled on iOS).Debug the binary to find interesting functions that we will jump to in the payload.Check the iOS crash logs to get the position of the link register (LR) so we can craft the payload.If you don’t know how to jailbreak your phone, please refer to unC0ver guide. Upload the iOS binary onto your jailbroken iOS via SFTP.We will go through each little step below in detail. Introduction to the binary we are exploitingīelow are the high-level step-through of what this blog post will cover.High level walk through of the steps we will take.This blog post is broken up into five sections, if you are familiar with my blog posts then this shouldn’t be a surprise. As such, I will be introducing you to buffer overflows and ROP chain attacks. The difference is this blog post will focus on exploiting iOS arm64 binaries and we will take what we learn from reversing the binary to perform two attacks. This blog post builds on Part 1’s knowledge of how to perform basic reversing on iOS apps. I have also included the source code on GitHub for all my evil cheaters out there!!! Don’t think for a second that I don’t know you exist :P.ĭownload the exercise binary “dontpopme” from Github here. Therefore, for this blog post/tutorial, I have compiled and built you an iOS binary that you can use and abuse. We will only be using FREE tools because I don’t like to spend money on nerd things. Calculating the runtime function addresses without disabling ASLR.Building and compiling your own iOS binary.Once again, I will walk you step-by-step through the following: Part 3: Heap Overflows on iOS ARM64: Heap Spraying, Use-After-Freeīy the end of this blog post you will be able to reverse engineer an arm64 iOS binary and exploit it in two ways – first through a buffer overflow, and then through a ROP chain. Part 2: Guide to Reversing and Exploiting iOS binaries: ARM64 ROP Chains Part 1: How to Reverse Engineer and Patch an iOS Application for Beginners If you’ve missed the blogs in the series, check them out below ^_^ This is PART 2 of how to reverse engineer and exploit iOS binaries. Welcome back my masochistic kings and queens.
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