PS5 BD-JB Exploit: PS5 JAR Loader release for Firmware 7.61 and below
Developer Hammer 83 has updated PS5 Jar Loader, following TheFloW’s disclosure of BD-JB for Firmware 7.61 and below. PS5 Jar Loader is a tool that leverages Blu-Ray vulnerabilities on the PS5, to load JAR Files easily.
What is PS5 JAR Loader
From the Readme:
This project uses vulnerabilities discovered in BD-J layer of PS5 firmware version 7.61 and earlier to deploy a loader that is able to listen to JAR files and execute their main class. This makes it easy to burn the BD-R disc with the loader just once and then keep on running new versions of the experimental code. This repository provides all the necessary setup needed to create both the loader BD-R disc filesystem and the JAR to send to the PS5.
What is BD-JB
The BD-JB exploit is a usermode exploit chain on the PS5 that allows unsigned code execution. It was initially known to run up to Firmware 4.51 (included) only. But hacker TheFloW, behind the original release, has updated the exploit chain with a new path traversal flaw, which allowed to “revive” the exploit up to Firmware 7.61 included. Although this is only a usermode exploit (it needs to be coupled with a Kernel exploit for an actual console Jailbreak, such a kernel exploit is currently only publicly known up to Firmware 4.51), it allows some experimentation with the PS5 for tinkerers, and could potentially open the console for more if a kernel exploit is ever found for these higher firmwares.
since BD-JB relies on vulnerabilities in the Blu-Ray layer of the PS5, it requires to burn BD Discs to run the code. PS5 JAR Loader makes it so that only one disc needs to be created (the one with JAR Loader), which will in return be able to load and run more payloads at runtime, sent via a TCP connection.
Download and use PS5 JAR Loader
To restate, in order to test this tool, you need a Disc edition PS5 on firmware 7.61 or below. Digital edition will not work since this requires a Blu-Ray.
The exploit needs to be burned onto a Blu-Ray disc. You can find Blu Ray burners for reasonably cheap on Amazon and other retailers (make sure they support BD-RE and Dual Layer DL). TheFloW has specified in the past that he used Rewritable Verbatim discs (BD-RE) in his own tests. (affiliate links).