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RHEL 9 must require a unique superusers name upon booting into single-user and maintenance modes.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-257789 | RHEL-09-212020 | SV-257789r958472_rule | High |
| Description |
|---|
| Having a nondefault grub superuser username makes password-guessing attacks less effective. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-61530r943053_chk ) |
|---|
| Verify the boot loader superuser account has been set with the following command: $ sudo grep -A1 "superusers" /etc/grub2.cfg set superusers=" export superusers The If superusers contains easily guessable usernames, this is a finding. |
| Fix Text (F-61454r943054_fix) |
|---|
| Configure RHEL 9 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 in the "### BEGIN /etc/grub.d/01_users ###" section: set superusers="superusers-account" export superusers Once the superuser account has been added, update the grub.cfg file by running: $ sudo grubby --update-kernel=ALL |