STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must require a unique superuser name upon booting into single-user and maintenance modes.

DISA Rule

SV-282470r1201601_rule

Vulnerability Number

V-282470

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

TOSS-05-000094

Severity

CAT I

CCI(s)

• CCI-000213 - Enforce approved authorizations for logical access to information and system resources in accordance with applicable access control policies.

Weight

10

Fix Recommendation

Configure TOSS 5 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 using the following command:

$ sudo grubby --update-kernel=ALL

Check Contents

Verify the boot loader superuser account has been set using the following command:

$ sudo grep -A1 "superusers" /etc/grub2.cfg

set superusers="<superusers-account>"
export superusers

The <superusers-account> is the actual account name, which is different from common names like "root", "admin", or "administrator".

If superusers contains easily guessable usernames, this is a finding.

Vulnerability Number

V-282470

Documentable

False

Rule Version

TOSS-05-000094

Severity Override Guidance

Verify the boot loader superuser account has been set using the following command:

$ sudo grep -A1 "superusers" /etc/grub2.cfg

set superusers="<superusers-account>"
export superusers

The <superusers-account> is the actual account name, which is different from common names like "root", "admin", or "administrator".

If superusers contains easily guessable usernames, this is a finding.

Check Content Reference

M

Target Key

5738