Funny, how things can get so easily overlooked.24-25-26-27-28? That's the kind of thing an idiot would have on his luggage!
Security researchers have discovered a ludicrously simple way to hack into a number of Linux distributions: Just tap the backspace key 28 times in a row. A team from the Cybersecurity Group at Polytechnic University of Valencia (UPV) in Spain found that doing so for builds utilizing the ubiquitous Grub2 bootloader -- that's to say just about all of them -- immediately bypasses the lock screen, initiates the "Grub rescue shell" and grants the user access to the system for whatever nefarious reason.
The team found that the backspace trick triggers a memory error, which in turn launches the rescue shell. The bug isn't a huge threat -- I mean, a hacker would need physical access to your machine in order to exploit it -- especially now that Ubuntu, Red Hat, and Debian all have released patches.
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- Red Squirrel
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I think this is only at the grub prompt though, which means you need physical access, in which case, the machine is already compromised if someone unauthorized is sitting in front of it. It is a really odd oversight though.