BaselineWatch
Desk
Your fleet and your work Fleetyour releases and the hardware they run onTriagewhat needs a decisionWatchlistthe products and platforms you runSaved searchesthe lists you come back to
This instance Sourceswhat is read, how often, under what termsDigestthe daily or weekly summary, and alerts
How it is drawn Appearancethe look and the colour schemeBrandingthe mark this instance wears
Owner sign-in

RHEL-10-600010 RHEL 10 must require a unique superusers name upon booting into single-user and maintenance modes.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

RHEL 10 must require a unique superusers name upon booting into single-user and maintenance modes.

Control

Verify RHEL 10 requires a unique superusers name upon booting into single-user and maintenance modes. Verify that the boot loader superuser account has been set with the following command: $ sudo grep -A1 "superusers" /etc/grub2.cfg set superusers="" export superusers password_pbkdf2 ${GRUB2_PASSWORD} Verify is not a common name such as root, admin, or administrator. If superusers contains easily guessable usernames, this is a finding.

Discussion

Having a nondefault grub superuser username makes password-guessing attacks less effective.

Related controls

CCI-000213

Fix

Configure RHEL 10 to have a unique username for the grub superuser account. Edit the "/etc/grub.d/01_users" file and add or modify the following lines with a nondefault username for the superuser account: set superusers="" export superusers Once the superuser account has been added, update the "grub.cfg" file by regenerating the GRUB configuration with the following command: $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg --update-bls-cmdline Reboot the system: $ sudo reboot