Evil Maid Just Got Angrier - Why Full-Disk Encryption ... - CanSecWest

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Outline 1 UEFI BIOS 2 Measured/Trusted Boot 3 The Real World: Bypassing Measured/Trusted Boot 4 Windows BitLocker with TPM 5 Secure Boot 6 What Else? 7 Anything We Can Do?
Anything We Can Do? If you care about Full-Disk Encryption or sneaky little UEFI malware ASUS is releasing fixed revision of UEFI BIOS. Update! Check with platform vendor if BIOS updates are signed and if BIOS meets NIST SP800-147 requirements Systems certified for Windows 8 are likely to sign UEFI updates Check UEFI BIOS protections on your system Do not leave your system unattended Do not enter PIN if concerned that BIOS was compromised Stop using systems with legacy BIOS NIST should have a test suite to validate SP800-147 requirements
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Evil Maid Just Got Angrier Why Full
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Outline 1 UEFI BIOS 2 Measured/Trus
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Legacy BIOS CPU Reset vector in ROM
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Legacy BIOS CPU Reset vector in ROM
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Security of Legacy BIOS Huh?
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Unified Extensible Firmware Interfa
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So is UEFI BIOS secure? UEFI specif
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Windows BitLocker http://technet.mi
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Typical Chain of Measurements
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Typical Chain of Measurements ⊗ I
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Page 36 and 37: Typical Chain of Measurements ⊗ I
Page 42 and 43: Outline 1 UEFI BIOS 2 Measured/Trus
Page 44 and 45: The Problem Startup UEFI BIOS firmw
Page 46 and 47: The Solution is Simple Just let Bit
Page 54 and 55: SPI Flash / BIOS Protections 1 Writ
Page 56 and 57: SPI Protected Range Registers http:
Page 60 and 61: Hey! We’ve Succeeded!
Page 62 and 63: NIST BIOS Protection Guidelines Rec
Page 64 and 65: UEFI Updates Aren’t Exactly Signe
Page 69 and 70: Angry Evil Maid Attack Outline Agai
Page 71 and 72: The Original Boot Block
Page 73 and 74: Writing Payload to Early BIOS in SP
Page 75 and 76: But That P67 Board Is Just Too Old
Page 77 and 78: ASUS P8Z77-V PRO Yes! UEFI BIOS upd
Page 79 and 80: Demo The problem applies to any Ful
Page 81 and 82: What About Secure Boot? UEFI 2.3.1
Page 83 and 84: Outline 1 UEFI BIOS 2 Measured/Trus
Page 85: BIOS Rootkits BIOS Rootkit [5,6,7,1
Page 89 and 90: Further Reading 1 Evil Maid goes af
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Evil Maid Just Got Angrier - Why Full-Disk Encryption ... - CanSecWest

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