TOCTOU, Traps, and Trusted Computing

@inproceedings{Bratus2008TOCTOUTA,
  title={TOCTOU, Traps, and Trusted Computing},
  author={Sergey Bratus and Nihal D'Cunha and Evan Sparks and Sean W. Smith},
  booktitle={TRUST},
  year={2008}
}
The security of the standard TCG architecture depends on whether the values in the PCRs match the actual platform configuration. However, this design admits potential for time-of-check time-of-use vulnerabilities: a PCR reflects the state of code and data when it was measured, not when the TPM uses a credential or signs an attestation based on that measurement. We demonstrate how an attacker with sufficient privileges can compromise the integrity of a TPM-protected system by modifying critical… CONTINUE READING
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