It is expected behaviour that on unix-like systems booting in single user mode leaves you with /bin/sh as init or something very much alike, and, obviously, bei

It is expected behaviour that on unix-like systems booting in single user mode leaves you with /bin/sh as init or something very much alike, and, obviously, being root. This is no different than booting a live{cd,usb} and at that point you're a mount/chroot/passwd away from resetting the password. Unless the disk is encrypted of course.