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In a well-closed system, sudo is used precisely to give very selective access to a certain account and / or a certain command. It is precisely those systems that will suffer from this bug. So it hits where it hurts the most.
No, because the bug only affects sudoers files configured to allow people to run a command as *literally anyone but root*. Not "one user". Literally "any user, including numeric users, except root". That kind of configuration makes *no sense*.
