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RHEL-10-400340 RHEL 10 must enforce mode "0600" or less permissive for Secure Shell (SSH) private host key files.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

RHEL 10 must enforce mode "0600" or less permissive for Secure Shell (SSH) private host key files.

Control

Verify RHEL 10 enforces mode "0600" for SSH private host key files with the following command: $ sudo stat -c "%a %n" /etc/ssh/*_key 600 /etc/ssh/ssh_host_ecdsa_key 600 /etc/ssh/ssh_host_ed25519_key 600 /etc/ssh/ssh_host_rsa_key If any private host key file has a mode more permissive than "0600", this is a finding.

Discussion

If an unauthorized user obtains the private SSH host key file, the host could be impersonated.

Related controls

CCI-000213

Fix

Configure RHEL 10 to enforce mode "0600" for SSH private host key files with the following command: $ sudo chmod 0600 /etc/ssh/ssh_host*key Restart the SSH daemon for the changes to take effect: $ sudo systemctl restart sshd.service