Researchers have found a new way to defeat the boot verification process for some Intel-based systems, but the technique can also impact other platforms and can be used to compromise machines in a stealthy and persistent way.

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Researchers Peter Bosch and Trammell Hudson presented a time-of-check, time-of-use (TOCTOU) attack against the Boot Guard feature of Intel's reference Unified Extensible Firmware Interface (UEFI) implementation at the Hack in the Box conference in Amsterdam this week.

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