CVE-2024-29943

A Pwn2Own SpiderMonkey JIT Bug: From Integer Range Inconsistency to Bound Check Elimination then RCE.

This repository contains PoC, Exploit and Analysis Slides for CVE-2024-29943.

Demo

Demo.mp4

Slides

Slides.pdf

Reproduce Information

• Github Git Commit: afbdf6822c9e9f9b6d44b9ea6904cb10878126b1
• Operating System: Ubuntu 22.04
• Architecture: amd64
• Command Line Arguments: ./js --ion-offthread-compile=off --spectre-mitigations=off PoC.js
• Patch for JitSpew Debug: JitSpew.patch

Acknowledgement

• Shoutout to Manfred Paul for finding the bug.
• Shoutout to @maxpl0it for giving the integer range inconsistent PoC.

References

1. https://hg.mozilla.org/mozilla-central/rev/45d29e78c0d8f9501e198a512610a519e0605458
2. https://github.com/mozilla/gecko-dev/commit/81806e7ccec7dde41e37c9891592a6e39ce46380
3. https://doar-e.github.io/blog/2018/11/19/introduction-to-spidermonkey-exploitation/
4. https://starlabs.sg/blog/2020/04-tianfu-cup-2019-adobe-reader-exploitation/