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← Back to Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

V-269139

CAT II (Medium)

AlmaLinux OS 9 must require authentication to access single-user mode.

Rule ID

SV-269139r1137691_rule

STIG

Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide

Version

V1R6

CCIs

CCI-000213

Discussion

This requirement prevents attackers with physical access from easily bypassing security on the machine and gaining root access. Such accesses are further prevented by configuring the bootloader password.

Check Content

Verify that AlmaLinux OS 9 requires authentication for single-user mode with the following command:

$ grep -E 'ExecStart.*sulogin' /usr/lib/systemd/system/rescue.service 

ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue

If this line is not returned or is commented out, this is a finding.

Fix Text

Configure AlmaLinux OS 9 to require authentication for single-user mode.

Add or modify the following line in the "/usr/lib/systemd/system/rescue.service" file:

ExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue

"sudo systemctl edit rescue.service" can also be used to create a "/etc/systemd/system/rescue.service.d/override.conf" file.