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Attack Vectors: Option ROMs 16 - stored on internal PCI(e) devices - and any external devices capable of PCI bus mastering: Firewire, Thunderbolt, ExpressCard, etc. - loaded during DXE phase as normal DXE drivers - no verification performed if SecureBoot is disabled - some systems will launch an Option ROM even if verification fails - attacker can modify an Option ROM of an existing device
Attack Vectors: BIOS Setup 17 - can control SPI flash access - controls SecureBoot - settings are stored in NVRAM variable called “Setup”, which can be changed from UEFI Shell (always) or any UEFI-bootable OS (if the variable has RT flag) - protected by password, which can be stored using a weak algor<strong>it</strong>hm, removed w<strong>it</strong>h “factory password” or reset by PC vendor
Page 1 and 2: Fix it yourself detecting and fixin
Page 3 and 4: Agenda 1 - Brief Intro to (U)EFI -
Page 5 and 6: Brief Intro to (U)EFI: What is it?
Page 7 and 8: Brief Intro to (U)EFI: SEC concepts
Page 9 and 10: Brief Intro to (U)EFI: DXE concepts
Page 11 and 12: What an Attacker Can Do? 9
Page 13 and 14: What an Attacker Can Do: A quote 11
Page 15 and 16: Attack Vectors: SPI flash chip 13 -
Page 17: Attack Vectors: S3 BootScript 15 -
Page 21 and 22: Attack Vectors: Vendor-specific 19
Page 23 and 24: Protections: SPI flash 21 - read-on
Page 25 and 26: Protections: S3 BootScript 23 - the
Page 27 and 28: Protections: BIOS settings 25 - the
Page 29 and 30: An Average System 27
Page 31 and 32: Test Tools 29
Page 33 and 34: Test Tools: UEFITool 31 - open sour
Page 35 and 36: Test Results 33
Page 37 and 38: Test Results: UEFITool 35 - BIOS ha
Page 39 and 40: What Now? 37
Page 41 and 42: Prepare to Dig Deep 39
Page 43 and 44: Prepare to Dig Deep: POST card 41 -
Page 45 and 46: Prepare to Dig Deep: Quanta ZQX pin
Page 47 and 48: Prepare to Dig Deep: SPI emulator 4
Page 49 and 50: Fix It Yourself 47
Page 51 and 52: Fix It Yourself: EmuVariable driver
Page 53 and 54: Fix It Yourself: Set PR registers 5
Page 55 and 56: Fix It Yourself: Decompile DSDT 53
Page 57 and 58: Fix It Yourself: Patch S3 setup han
Page 59 and 60: Fix It Yourself: PreventS3Pei drive
Page 61 and 62: Fix It Yourself: Generate PK 59 - P
Page 63 and 64: Fix It Yourself: Generate db 61 - d
Page 65 and 66: Fix It Yourself: Enable SecureBoot
Page 67 and 68: Fix It Yourself: Remove other stuff
Page 69 and 70:
Conclusion: Summary 67 - PC is stil
Page 71 and 72:
Conclusion: What else? 69 - try to
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Fix it yourself

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