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Full Discussion: Linux root Password Reset
Top Forums UNIX for Beginners Questions & Answers Linux root Password Reset Post 303008536 by vbe on Saturday 2nd of December 2017 11:02:17 AM
Old 12-02-2017
Security here is to be understood from outer world, servers are in computer rooms, I doubt you unless you are a senior sysadm will have access, as mentionned above there is no more security if someone can physically get hold of your equipment, to be able to use grub means being in front of the PC... All you can do in such case is not allow to boot from any other device on your PC, and now you can guess what possible issue you risk...
That is why the hardening is difficult with cheap equipment
 

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GRUB-SETUP(8)						  System Administration Utilities					     GRUB-SETUP(8)

NAME
grub-setup - set up a device to boot using GRUB SYNOPSIS
grub-setup [OPTION...] DEVICE DESCRIPTION
Set up images to boot from DEVICE. You should not normally run this program directly. Use grub-install instead. -a, --allow-floppy Make the drive also bootable as floppy (default for fdX devices). May break on some BIOSes. -b, --boot-image=FILE Use FILE as the boot image [default=boot.img] -c, --core-image=FILE Use FILE as the core image [default=core.img] -d, --directory=DIR Use GRUB files in the directory DIR [default=/boot/grub] -f, --force Install even if problems are detected -m, --device-map=FILE Use FILE as the device map [default=/boot/grub/device.map] -r, --root-device=DEV Use DEV as the root device [default=guessed] -s, --skip-fs-probe Do not probe for filesystems in DEVICE -v, --verbose Print verbose messages. -?, --help give this help list --usage give a short usage message -V, --version print program version Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options. DEVICE must be an OS device (e.g. /dev/sda). REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
grub-install(8), grub-mkimage(1), grub-mkrescue(1) The full documentation for grub-setup is maintained as a Texinfo manual. If the info and grub-setup programs are properly installed at your site, the command info grub-setup should give you access to the complete manual. grub-setup (GRUB) 1.99-12ubuntu5 October 2011 GRUB-SETUP(8)
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