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macOS LPE (CVE-2023-32413 / ZDI-23-845 / Pwn2Own Vancouver 2023) exploit

This is the exploit code that has been played at Pwn2Own Vancouver 2023 (https://youtu.be/c0cS4R0ja-I?t=180).

This code exploits CVE-2023-32413 to gain root rights on any vulnerable macOS. The vulnerability is a logic TOCTOU that can be used to overwrite any file that can be read. The exploit is fast, 100% reliable, give a root shell AND display an animated ascii art (🥷🔪🍎).

The vulnerability has been patched in may 2023 but the associated (partial) SIP bypass was still present (CVE-2023-42914), this other bug has been fixed in december 2023.

More details can be found in the "Finding and Exploiting an Old XNU Logic Bug" presentation made at Hexacon 2023: https://www.synacktiv.ninja/sites/default/files/2024-11/finding_and_exploiting_an_old_xnu_logic_bug.pdf / https://www.youtube.com/watch?v=J2QR58JAO7Q