Rafal Wojtczuk and Joanna Rutkowska - Black Hat

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We have provided Intel with the details of the new SMM issues affecting their recent BIOSes on December 10 th , 2008.
Intel confirmed the problems in their BIOSes as affecting: “mobile, desktop, <strong>and</strong> server motherboards", without providing any more details about which exact models are vulnerable.
Page 1:
Attacking Intel ® Trusted Executio
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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
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Example #1: Disk Encryption Disk en
Page 18 and 19:
So, a malware can sniff it…
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Example #2: User’s Picture Test :
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Problems with SRTM
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Dynamic Root of Trust Measurement (
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A VMM we want to load (Currently un
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TXT bottom line TXT late launch can
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GRUB (1 st stage) GRUB (2 nd stage)
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First we start “trusted” Xen (b
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Thanks to tboot only when the trust
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Tboot Demo #1: sealing to a trusted
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SENTER is not obligatory!!! TXT and
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Why would a user or an attacker be
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AMD Presidio AMD’s technology sim
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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
Page 86 and 87: The BIOS image on the SPI-flash is
Page 88 and 89: Remember our Q35 bug from Vegas? (W
Page 90 and 91: Now, applying this to SMM...
Page 95 and 96: We see we can access SMM memory usi
Page 97 and 98: So, what now?
Page 99: December 2008: Intel We think TXT i
Page 103 and 104: Intel believes the issues might aff
Page 105 and 106: CERT has assigned the following tra
Page 107 and 108: Stay tuned! (and don’t trust your
Page 109 and 110: Intel Solution to the TXT attack is
Page 111 and 112: Potential issues with STM STM seems
Page 113 and 114: Intel Why should we trust BIOS vend
Page 115 and 116: Intel offered us a chance to read t
Page 117 and 118: There are some other issues with ST
Page 119 and 120: Still, allowing TXT to work without
Page 121 and 122: Intel TXT is a new exciting technol
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Rafal Wojtczuk and Joanna Rutkowska - Black Hat

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