Boot Loader Passwords


Boot Loader Passwords

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

   1. Preventing Access to Single User Mode

If attackers can boot the system into single user mode they are logged in automatically as root without being prompted for the root password.

   2. Preventing Access to the GRUB Console

If the machine uses GRUB as its boot loader, an attacker can use the GRUB editor interface to change its configuration or to gather information using the cat command.

   3. Preventing Access to Insecure Operating Systems

If it is a dual-boot system, an attacker can select an operating system at boot time (for example, DOS), which ignores access control and file permissions. Fedora ships with the GRUB boot loader on the x86 platform.

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