WHW0x455

Bypass PAC in JIT

The code snippets and conceptual analysis presented in this document are based on iOS 16.2.

The bug was disclosed and patched after Pwn2Own 2024 and was assigned CVE-2024-27834. Details of the patch can be found in the WebKit repository.

• https://support.apple.com/en-us/120905
• https://github.com/WebKit/WebKit/commit/3e3d0883c84955472ece1b2f2e63f31522c5440d

bmwalters

tl;dr

The iphone-dataprotection project (GiHub mirror) includes a tool to determine an iOS device's 4-digit passcode using a brute force technique. That project only claims support for devices <= iOS 8 and < A5. It turns out the code also supports A5 devices on iOS 9.

However the brute force utility also requires a companion kernel patch to enable access to keys such as 0x835 in calls to the AES accelerator from userland. This doc confirms the value of said patches for 32-bit iOS 9.

This writeup also describes the various st