Security

This page explains how coreboot can help with various security aspects of your system, compared to closed-source, legacy BIOS/EFI/firmware implementations.

This page is work in progress!

Common security features

• Boot password (like BIOS password)
• Signature verification - option to boot from payload only signed images

Bayou / coreinfo / GRUB2 have "BIOS password"-like feature, using SHA-1 hashes stored in NVRAM or the (flash) ROM chip. GRUB2 can also do signature verification of on-disk operating systems. TianoCore could probably be adapted to support either, too.

Both features are in the payload domain since coreboot doesn't provide a user interface.

• RAM wiping after each boot

This is not very useful: The most interesting time would be right before power-off, which could be implemented in SMM. Unfortunately a cautious attacker just pulls the plug.

To prevent reading data after a reboot, a payload could be adapted to clean out memory. Using applications that manage sensible data sensibly (ie. wipe after use) is still a better solution.

• Support booting from encrypted block devices/volumes

GRUB2 can do that.

Current BIOS issues

RAM wiping

• http://citp.princeton.edu/memory/
• Coreinfo as demo payload for coreboot, showing your RAM contents after a cold boot.

SMI issues

• http://www.ssi.gouv.fr/fr/sciences/fichiers/lti/cansecwest2006-duflot.pdf
• http://tracker.coreboot.org/trac/coreboot/ticket/42

ATA issues

• http://coreboot.org/pipermail/coreboot/2005-May/011686.html
• http://www.heise.de/ct/english/05/08/172/

Firewire issues

• http://md.hudora.de/presentations/firewire/
• http://www.hermann-uwe.de/blog/physical-memory-attacks-via-firewire-dma-part-1-overview-and-mitigation

TPM issues

• http://tracker.coreboot.org/trac/coreboot/ticket/49