Following Parts 1 through 3 of their PS4 Aux Hax covering hacking Aeolia, Syscon and DS4 today PlayStation 4 hackers fail0verflow shared documentation on PS4 Aux Hax 4 which uses HDMI (High-Definition Multimedia Interface) CEC (Consumer Electronics Control) to get code exec on all PS4 Belize southbridge versions (including PS4 Pro, etc) without requiring other parts of the system to be pwned!
According to Wikipedia, CEC is a feature of HDMI designed to allow users to command and control devices connected through HDMI by using only one remote control... and the bug is in the HDMI CEC code with the path reachable when HDMI-CEC is enabled and active.
Be sure to check out the full PS4 Aux Hax 4: Belize via CEC documentation on their latest Blog Entry, and to quote in part:
Proceeding his recent PS4 Debug Trophies ShellCore Patch, PlayStation 4 developer @flatz (Twitter) made available both an (f)SELF loader via server fPKG application and a PS4 Stub Library Maker (using OrbisLibGen generate stub files) on Github alongside a Windows compiled PKG version below by @zecoxao on Twitter to try fSELFs without installing the full Package file saving scene devs time testing changes.
Also below is a brief demo video by Lil Xo of the PS4 Payload Loader launching before receiving a CE-34224-5 'Cannot start the application' error followed by a fixed version, and a screenshot of the ZLibTest.pkg being loaded ready to use.