Why should a Linux boot loader have password protection?

Updated -

The following are the primary reasons for password protecting a Linux boot loader:

  1. Preventing Access to Single User Mode - If an attacker can boot into single user mode, he becomes the root user.

  2. Preventing Access to the GRUB Console - If the machine uses GRUB as its boot loader, an attacker can use the use the GRUB editor interface to chang...

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