DEF CON CTF 2021 Quals baby-a-fallen-lap-ray writeup

Outline:

• Introduction
• First impressions
• Architecture reversing
• Binary Ninja plugin development
• Reverse engineering the actual challenge
• Exploiting the challenge
• Commentary about tooling
• Other writeups

Introduction

This weekend, Samurai played the DEF CON CTF Qualifier event. We had a great time playing; much thanks to the organizers for putting on a great event! Many thanks to my teammates, it was awesome playing with you all!

One of the challenges this weekend was called baby-a-fallen-lap-ray. It was categorized as a pwn challenge, and it made a comment about being ‘the return of the parallel machine (or is it?)’.

Continue reading “Reversing and exploiting a program running in an undocumented VM” →