FUD aside, I'm taking a look at the Intel DCI protocol (JTAG over USB3). Doesn't look very complicated. OpenOCD for Skylake anyone?pic.twitter.com/eXE5n4I00R
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I'm worried about scenario of "plug usb kit, hard reboot, implant". Once the OS is running, it's usually quite harder
There's more than one TAP accessible via DCI. Wouldn't be surprised if you could still take over w/o x86 JTAG.
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But really the whole point is this should be disabled in PCH from boot.
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It's trivial to check if you're vulnerable. Connect USB3 crossover cable to host, reboot. If it ever enumerates, vuln.
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