Dell Firmware Security
Dell Firmware Security
Past, Present, and Future
Justin Johnson
Senior Principal Firmware Engineer justin.johnson1@
Dell Security
Copyright 2018 Dell Technologies ? All Rights Reserved 2
What does BIOS do?
Configure and Test System Memory Configure Chipset
Discover Attached Peripherals Locate, Load, and Execute Bootloader
Copyright 2018 Dell Technologies ? All Rights Reserved 3
BIOS Write Protections
? During runtime, block host writes from outside of SMM
? Chipset protection through three bits in BIOS Control register
? EISS or SMM_BWP ? BLE ? WPD or BIOS_WE
4
Copyright 2018 Dell Technologies ? All Rights Reserved
BIOS Write Protections
? BIOS updates are digitally signed by Dell ? Updates signed with trusted key are written to flash
during reboot cycle ? Follows NIST 800-147 requirements for protected
updates
BIOS Update
Signature
Platform Reset
Signature Verification
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Copyright 2018 Dell Technologies ? All Rights Reserved
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