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UBTU-22-255025 Ubuntu 22.04 LTS must not allow unattended or automatic login via SSH.

DISA STIG library V2R10
All changes in this version
first version loaded CAT I

Maps to CM-6 via CCI-000366

Title

Ubuntu 22.04 LTS must not allow unattended or automatic login via SSH.

Control

Verify that unattended or automatic login via SSH is disabled by using the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iEH '(permit(.*?)(passwords|environment))' /etc/ssh/sshd_config:PermitEmptyPasswords no /etc/ssh/sshd_config:PermitUserEnvironment no If "PermitEmptyPasswords" and "PermitUserEnvironment" are not set to "no", are commented out, are missing, or conflicting results are returned, this is a finding.

Discussion

Failure to restrict system access to authenticated users negatively impacts Ubuntu 22.04 LTS security.

Related controls

CCI-000366

Fix

Configure the SSH server to not allow unattended or automatic login to the system. Add or modify the following lines in the "/etc/ssh/sshd_config" file: PermitEmptyPasswords no PermitUserEnvironment no Restart SSH for the changes to take effect: $ sudo systemctl restart ssh