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RHEL-10-700500 RHEL 10 must be configured so that Secure Shell (SSH) public host key files have mode "0644" or less permissive.

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

Maps to SI-6 via CCI-002696

Title

RHEL 10 must be configured so that Secure Shell (SSH) public host key files have mode "0644" or less permissive.

Control

Verify RHEL 10 SSH public host key files have a mode of "0644" or less permissive with the following command: Note: SSH public key files may be found in other directories on the system depending on the installation. $ sudo stat -c "%a %n" /etc/ssh/*.pub 644 /etc/ssh/ssh_host_dsa_key.pub 644 /etc/ssh/ssh_host_ecdsa_key.pub 644 /etc/ssh/ssh_host_ed25519_key.pub 644 /etc/ssh/ssh_host_rsa_key.pub If any "key.pub" file has a mode more permissive than "0644", this is a finding.

Discussion

If a public host key file is modified by an unauthorized user, the SSH service may be compromised.

Related controls

CCI-002696

Fix

Configure RHEL 10 SSH public host key files to have mode "0644" or less permissive. Change the mode of public host key files under "/etc/ssh" to "0644" with the following command: $ sudo chmod 0644 /etc/ssh/*key.pub Restart the SSH daemon with the following command for the changes to take effect: $ sudo systemctl restart sshd.service