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Found in the wild: The world’s first unkillable UEFI bootkit for Linux (arstechnica.com)

submitted 3 weeks ago by [email protected] to c/technology

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“Whether a proof of concept or not, Bootkitty marks an interesting move forward in the UEFI threat landscape, breaking the belief about modern UEFI bootkits being Windows-exclusive threats,” ESET researchers wrote. “Even though the current version from VirusTotal does not, at the moment, represent a real threat to the majority of Linux systems, it emphasizes the necessity of being prepared for potential future threats.”

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[–] [email protected] 74 points 3 weeks ago* (last edited 3 weeks ago) (25 children)

The Bootkitty sample ESET found is unable to override a defense, known as UEFI Secure Boot, that uses cryptographic signatures to ensure that each piece of software loaded during startup is trusted by a computer's manufacturer.

AKA not that big of a deal, yet. An article from another post about this also mentions GRUB explicitly as a requirement as well as PoC using self signed keys, which renders it sort of impossible to abuse.

UKI + your own keys + secure boot is still not broken.

[–] CriticalMiss 4 points 3 weeks ago (3 children)

How many distros support secure boot out of the box? IIRC it’s only Ubuntu and RHEL. The rest require hacking some shit together with self signed keys.

[–] [email protected] 2 points 3 weeks ago (2 children)

Don't know, been rolling with Gentoo for some time now.

I wouldn't trust "out of the box" support anyway as that would imply trusting microsoft keys.

[–] raldone01 2 points 3 weeks ago* (last edited 3 weeks ago)

It is so annoying that one can't ditch m$ keys and still boot windows. Sure you can sign the windows bootloader with your own keys. However it checks its own signature and just refuses to boot.

If anyone has a solution let me know.

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