# spidermonkey

SpiderMonkey is Mozilla's JavaScript and WebAssembly engine, implemented as a library that can be embedded in C++ and Rust projects.

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

DevFeed: [A journey into IonMonkey: root-causing CVE-2019-9810.](<https://devfeed.tech/articles/a-journey-into-ionmonkey-root-causing-cve-2019-9810-39710.md>)

Original publisher: [Read original article](<https://doar-e.github.io/blog/2019/06/17/a-journey-into-ionmonkey-root-causing-cve-2019-9810/>)

Author: Axel "0vercl0k" Souchet

Published: 2019-06-17T15:00:00Z

Content type: tutorial

Language: en

Sources: [Diary of a reverse-engineer](<https://devfeed.tech/sources/diary-of-a-reverse-engineer.md>)

Topics: [Exploit](<https://devfeed.tech/topics/exploit.md>), [spidermonkey](<https://devfeed.tech/topics/spidermonkey.md>), [JIT](<https://devfeed.tech/topics/jit.md>), [Optimization](<https://devfeed.tech/topics/optimization.md>), [Compiler](<https://devfeed.tech/topics/compiler.md>), [Firefox](<https://devfeed.tech/topics/firefox.md>), [Assembly](<https://devfeed.tech/topics/assembly.md>), [Mozilla](<https://devfeed.tech/topics/mozilla.md>)

Tags: [assembly](<https://devfeed.tech/tags/assembly.md>), [browser](<https://devfeed.tech/tags/browser.md>), [cve](<https://devfeed.tech/tags/cve.md>), [exploit](<https://devfeed.tech/tags/exploit.md>), [exploitation](<https://devfeed.tech/tags/exploitation.md>), [firefox](<https://devfeed.tech/tags/firefox.md>), [ion](<https://devfeed.tech/tags/ion.md>), [ionmonkey](<https://devfeed.tech/tags/ionmonkey.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [jit](<https://devfeed.tech/tags/jit.md>), [mozilla](<https://devfeed.tech/tags/mozilla.md>), [optimization](<https://devfeed.tech/tags/optimization.md>), [spidermonkey](<https://devfeed.tech/tags/spidermonkey.md>)

### AI overview

This article examines the root cause of CVE-2019-9810, an IonMonkey issue in Mozilla's speculative JIT engine. It describes the author's investigation of Ion's codebase, including the issue's alias information and the related AliasAnalysis optimization pass.

### Source excerpt

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 to SpiderMonkey exploitation.

DevFeed: [Introduction to SpiderMonkey exploitation.](<https://devfeed.tech/articles/introduction-to-spidermonkey-exploitation-39707.md>)

Original publisher: [Read original article](<https://doar-e.github.io/blog/2018/11/19/introduction-to-spidermonkey-exploitation/>)

Author: Axel "0vercl0k" Souchet

Published: 2018-11-19T16:25:00Z

Content type: article

Language: en

Sources: [Diary of a reverse-engineer](<https://devfeed.tech/sources/diary-of-a-reverse-engineer.md>)

Topics: [Exploit](<https://devfeed.tech/topics/exploit.md>), [spidermonkey](<https://devfeed.tech/topics/spidermonkey.md>), [Firefox](<https://devfeed.tech/topics/firefox.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [JIT](<https://devfeed.tech/topics/jit.md>), [Windows](<https://devfeed.tech/topics/windows.md>), [Shell](<https://devfeed.tech/topics/shell.md>), [ctf](<https://devfeed.tech/topics/ctf.md>)

Tags: [blazefox](<https://devfeed.tech/tags/blazefox.md>), [ctf](<https://devfeed.tech/tags/ctf.md>), [exploit](<https://devfeed.tech/tags/exploit.md>), [exploitation](<https://devfeed.tech/tags/exploitation.md>), [firefox](<https://devfeed.tech/tags/firefox.md>), [interpreter](<https://devfeed.tech/tags/interpreter.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [jit](<https://devfeed.tech/tags/jit.md>), [mozilla](<https://devfeed.tech/tags/mozilla.md>), [payload](<https://devfeed.tech/tags/payload.md>), [spidermonkey](<https://devfeed.tech/tags/spidermonkey.md>), [ttd](<https://devfeed.tech/tags/ttd.md>), [windows](<https://devfeed.tech/tags/windows.md>)

### AI overview

This blog post explains the development of three exploits targeting the SpiderMonkey JavaScript engine and Mozilla Firefox on 64-bit Windows. It progresses from a WinDbg JavaScript extension and a build-specific interpreter exploit to dynamically resolving targets and using the baseline JIT to generate ROP gadgets or native code payloads.

### Source excerpt

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 ...