A journey into IonMonkey: root-causing CVE-2019-9810.

Introduction

In May, I wanted to play with BigInt and evaluate how I could use them for browser exploitation. The exploit I wrote for the blazefox relied on a Javascript library developed by @5aelo that allows code to manipulate 64-bit integers. Around the same …

Introduction

This blogpost covers the development of three exploits targeting SpiderMonkey JavaScript Shell interpreter and Mozilla Firefox on Windows 10 RS5 64-bit from the perspective of somebody that has never written a browser exploit nor looked closely at any JavaScript engine codebase.

As you have probably noticed, there has been …