Finding ID | Version | Rule ID | IA Controls | Severity |
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V-258001 | RHEL-09-255125 | SV-258001r991589_rule | Medium |
Description |
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If a public host key file is modified by an unauthorized user, the SSH service may be compromised. |
STIG | Date |
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Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-06-04 |
Check Text ( C-61742r925988_chk ) |
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Verify the 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. |
Fix Text (F-61666r925989_fix) |
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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 for the changes to take effect: $ sudo systemctl restart sshd.service |