Bypassing Hardware-Based Trusted Boot Through x86 Downgrade

Bypassing Hardware-Based Trusted Boot Through x86 Downgrade

Hack In The Box Security Conference via YouTube Direct link

Downgrading ACMs. Intel BIOS Guard

16 of 19

16 of 19

Downgrading ACMs. Intel BIOS Guard

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Bypassing Hardware-Based Trusted Boot Through x86 Downgrade

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  1. 1 Intro
  2. 2 Inside Intel CPU
  3. 3 Firmware Interface Table (FIT)
  4. 4 Microcode Update binary main header
  5. 5 Microcode Update binary extended header
  6. 6 Microcode Update binary data
  7. 7 Known facts about Microcode
  8. 8 Authenticated Code Modules (ACMS)
  9. 9 Useful links to start digging
  10. 10 Updating Microcode in UEFI BIOS
  11. 11 Microcode Update loading process
  12. 12 Platform Init
  13. 13 Microcode Downgrade
  14. 14 Side channel attacks
  15. 15 Debug capabilities
  16. 16 Downgrading ACMs. Intel BIOS Guard
  17. 17 Downgrading ACMs. Intel TXT
  18. 18 #Report and Reaction
  19. 19 #Mitigations

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