The cursor and other 'magic' keys send special key codes through the
terminal, where sudo reads the password from.

Cursor keys (and others) work just fine in passwords, so breaking those
(which are actually really good password characters!) for the sake of
"aesthetics" is not warranted at all.

** Changed in: sudo (Ubuntu)
       Status: New => Won't Fix

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sudo password takes up arrow
https://bugs.launchpad.net/bugs/162121
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