SLEM 5 SSH daemon public host key files must have mode 644 or less permissive.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-261293	SRG-OS-000480-GPOS-00227	SLEM-05-232040	SV-261293r996357_rule	2024-06-04	1

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

ℹ️ Check
Verify SLEM 5 SSH daemon public host key files have mode "644" 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. > find /etc/ssh -name 'ssh_host*key.pub' -exec stat -c "%a %n" {} \; 644 /etc/ssh/ssh_host_rsa_key.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 If any file has a mode more permissive than "644", this is a finding.

ℹ️ Check

Verify SLEM 5 SSH daemon public host key files have mode "644" 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. > find /etc/ssh -name 'ssh_host*key.pub' -exec stat -c "%a %n" {} \; 644 /etc/ssh/ssh_host_rsa_key.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 If any file has a mode more permissive than "644", this is a finding.

✔️ Fix
Configure SLEM 5 SSH daemon public host key files have mode "644" or less permissive. Note: SSH public key files may be found in other directories on the system depending on the installation. Change the mode of public host key files under "/etc/ssh" to "644" with the following command: > sudo chmod 644 /etc/ssh/ssh_host*key.pub