Speculation that the T2 security chip on modern Macs can be hacked has been confirmed by the team behind the research. A combination of two different exploits would give a hacker the ability to modify the behavior of the chip, and even plant malware like a keylogger inside it.
All Macs sold since 2018 contain the T2 chip, and because the attack uses code in the read-only memory section of the chip, there is no way for Apple to patch it …
How the T2 security chip exploit works
ZDNet reports that the attack involves using two exploits used to jailbreak iPhones. The reason they can also be used on Macs is because the T2 security chip is based on the A10 chip used in older iPhones.
The attack requires combining two other exploits that were initially used for jailbreaking iOS devices — namely Checkm8 and Blackbird. This works because of some shared hardware and software features between T2 chips and iPhones and their underlying hardware.
Read more at 9to5Mac.com