Red Hat Enterprise Linux operating systems version 7.2 or newer booted with United Extensible Firmware Interface (UEFI) must have a unique name for the grub superusers account when booting into single-user mode and maintenance.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-244558	RHEL-07-010492	SV-244558r744066_rule		Medium

Description
If the system does not require valid authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2021-06-14

Details

Check Text ( C-47833r744064_chk )
For systems that use BIOS, this is Not Applicable. For systems that are running a version of RHEL prior to 7.2, this is Not Applicable. Verify that a unique name is set as the "superusers" account: $ sudo grep -iw "superusers" /boot/efi/EFI/redhat/grub.cfg set superusers="[someuniquestringhere]" export superusers If "superusers" is not set to a unique name or is missing a name, this is a finding.

Check Text ( C-47833r744064_chk )

For systems that use BIOS, this is Not Applicable.

For systems that are running a version of RHEL prior to 7.2, this is Not Applicable.

Verify that a unique name is set as the "superusers" account:

$ sudo grep -iw "superusers" /boot/efi/EFI/redhat/grub.cfg
set superusers="[someuniquestringhere]"
export superusers

If "superusers" is not set to a unique name or is missing a name, this is a finding.

Fix Text (F-47790r744065_fix)
Configure the system to have a unique name for the grub superusers account. Edit the /boot/efi/EFI/redhat/grub.cfg file and add or modify the following lines in the "### BEGIN /etc/grub.d/01_users ###" section: set superusers="[someuniquestringhere]" export superusers password_pbkdf2 [someuniquestringhere] ${GRUB2_PASSWORD}