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I'm staring at my MAC now and wondering if my Little Snitch will prevent this type of hijacking. I expect the firewall to ask me how to treat a new interface before sending packets there.

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No, the rules aren't per interface and there's no authentication of a new network device.

It appears you are mistaken: a properly configured little snitch will protect you. You can configure APS (automatic profile switching) to pause and ask every time your mac connects to an unknown network -- not a device, as I imagined, but a network.

Here is a detailed post: https://blog.obdev.at/automatic-profile-switching/

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