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RHEL-09-255120 RHEL 9 SSH private host key files must have mode 0600 or less permissive.

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

Maps to CM-6 via CCI-000366

Title

RHEL 9 SSH private host key files must have mode 0600 or less permissive.

Control

Verify the SSH private host key files have a mode of "0600" or less permissive with the following command: $ stat -c "%a %n" /etc/ssh/*_key 600 /etc/ssh/ssh_host_dsa_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-000366

Fix

Configure the mode of SSH private host key files under "/etc/ssh" to "0600" 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