STIGQter STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS must not permit direct logons to the root account using remote access from outside of the system via SSH.

DISA Rule

SV-252915r1016299_rule

Vulnerability Number

V-252915

Group Title

SRG-OS-000109-GPOS-00056

Rule Version

TOSS-04-010040

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure TOSS to stop users from logging on remotely from outside of the cluster as the "root" user via SSH.

Edit the appropriate "/etc/ssh/sshd_config" file to uncomment or add the line for the "PermitRootLogin" keyword and set its value to "no":

PermitRootLogin no

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

$ sudo systemctl restart sshd.service

Check Contents

Verify remote access from outside the system using SSH prevents users from logging on directly as "root."

Check that SSH prevents users from logging on directly as "root" with the following command:

$ sudo grep -i PermitRootLogin /etc/ssh/sshd_config

PermitRootLogin no

If the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Vulnerability Number

V-252915

Documentable

False

Rule Version

TOSS-04-010040

Severity Override Guidance

Verify remote access from outside the system using SSH prevents users from logging on directly as "root."

Check that SSH prevents users from logging on directly as "root" with the following command:

$ sudo grep -i PermitRootLogin /etc/ssh/sshd_config

PermitRootLogin no

If the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Check Content Reference

M

Target Key

5469