Title

RHEL 9 SSH server configuration files' permissions must not be modified. (Cat II impact)

Discussion

Service configuration files enable or disable features of their respective services, that if configured incorrectly, can lead to insecure and vulnerable configurations. Therefore, service configuration files must have correct permissions (owner, group owner, mode) to prevent unauthorized changes.

Check Content

Verify the permissions of the "/etc/ssh/sshd_config" file with the following command: $ sudo rpm --verify openssh-server | awk '! ($2 == "c" && $1 ~ /^.\..\.\.\.\..\./) {print $0}' If the command returns any output, this is a finding.

Fix Text

Run the following commands to restore the correct permissions of OpenSSH server configuration files: $ rpm --setugids openssh-server $ rpm --setperms openssh-server

Additional Identifiers

Rule ID: SV-257999r1134918_rule

Vulnerability ID: V-257999

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.