The presentation discusses the T2 chip and its role in enhancing secure boot and mitigating firmware attacks on Apple devices.
- The T2 chip utilizes integrity protection features found on the iPhone and Apple Watch to create a hardware root of trust.
- The T2 chip replaces the vulnerable flash chip on the motherboard and becomes the arbiter of all flash access operations.
- The T2 chip enhances secure boot by utilizing the slave attached flash functionality typically found on Xeon chipsets.
- The T2 chip's user LAN interface, Mac EFI Util, manages UEFI firmware and non-volatile variables.
- Firmware attacks can be mitigated by eliminating the vulnerable flash chip and utilizing the T2 chip's secure boot features.
The presentation describes how the T2 chip replaces the vulnerable flash chip on the motherboard, which can be exploited through software or hardware-based attacks. The T2 chip utilizes the enhanced serial peripheral interface (East by) to communicate with embedded controllers and BMCs, and becomes the arbiter of all flash access operations. This functionality allows the T2 chip to quickly reset the UEFI firmware or perform remote upgrades, enhancing secure boot and mitigating firmware attacks.