the UEFI doesn't have any unintended security vulnerabilities which allow overwriting it with arbitrary code or can otherwise be exploited to cause damage.Īnd those two assumptions do not necessarily hold.the mainboard manufacturers manage to keep their private keys secret.That means it should not be possible to overwrite it with arbitrary code. However, most UEFIs will not accept an update which isn't digitally signed by the manufacturer. Updating the UEFI firmware from the running operating system is a standard procedure, so any malware which manages to get executed on the operating system with sufficient privileges could attempt to do the same. Modern computers don't have a BIOS, they have a UEFI.
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