Rafal Wojtczuk and Joanna Rutkowska - Black Hat

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A VMM we want to load (Currently unprotected) The VMM loaded <strong>and</strong> its hash stored in PCR18 VMM SENTER VMM TPM PCR18 secret key TPM will unseal secrets to the justloaded VMM only if it is The Trusted VMM Notes: Diagram is not in scale! SENTER also resets <strong>and</strong> extends PCR17 with hash of SINIT/BIOSACM/(STM)/ LCP
SENTER — one of a few new instructions introduced by TXT (They are all called SMX extensions)
Page 1: Attacking Intel ® Trusted Executio
Page 4 and 5: Intel ® Trusted Execution Technolo
Page 6 and 7: TPM 1.2 Passive I/O device (master-
Page 8 and 9: PCR “extend” operation PCRN+1 =
Page 10 and 11: TPM seal/unseal example # echo 'Sec
Page 12 and 13: Both seal/unseal and quote operatio
Page 14 and 15: BIOS ROM BIOS FLASH BOOT LOADER OS
Page 16 and 17: Example #1: Disk Encryption Disk en
Page 18 and 19: So, a malware can sniff it…
Page 20 and 21: Example #2: User’s Picture Test :
Page 22 and 23: Problems with SRTM
Page 24 and 25: Dynamic Root of Trust Measurement (
Page 28 and 29: TXT bottom line TXT late launch can
Page 30 and 31: GRUB (1 st stage) GRUB (2 nd stage)
Page 32: First we start “trusted” Xen (b
Page 36 and 37: Thanks to tboot only when the trust
Page 38: Tboot Demo #1: sealing to a trusted
Page 42 and 43: SENTER is not obligatory!!! TXT and
Page 44 and 45: Why would a user or an attacker be
Page 46 and 47: AMD Presidio AMD’s technology sim
Page 48 and 49: SRTM/DRTM (launch-time protection)
Page 50 and 51: TXT: exciting new technology with g
Page 52 and 53: Q: What is more privileged than a k
Page 54 and 55: Introducing “Ring -2” SMM can a
Page 56 and 57: SMM vs. TXT?
Page 58 and 59: Q: Does TXT measure currently used
Page 60 and 61: Q:So, how does the SENTER deal with
Page 62 and 63: TXT attack sketch (using tboot+Xen
Page 64 and 65: Address of the shellcode (in the gu
Page 67: The final outcome...
Page 70 and 71: Stay tuned! SMM exploiting to be pr
Page 73 and 74: More on the Implementation Bugs
Page 75 and 76: SMM research quick history
Page 77 and 78:
No SMM bugs known... ...cannot read
Page 79:
De-soldering?
Page 84 and 85:
De-soldered SPI-flash chip
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The BIOS image on the SPI-flash is
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Remember our Q35 bug from Vegas? (W
Page 90 and 91:
Now, applying this to SMM...
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We see we can access SMM memory usi
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So, what now?
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December 2008: Intel We think TXT i
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Intel confirmed the problems in the
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Intel believes the issues might aff
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CERT has assigned the following tra
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Stay tuned! (and don’t trust your
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Intel Solution to the TXT attack is
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Potential issues with STM STM seems
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Intel Why should we trust BIOS vend
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Intel offered us a chance to read t
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There are some other issues with ST
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Still, allowing TXT to work without
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Intel TXT is a new exciting technol
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Rafal Wojtczuk and Joanna Rutkowska - Black Hat

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