V-253998

Discussion

Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done or attempted to be done, and by whom, to compile an accurate risk assessment. Auditing the actions on network devices provides a means to recreate an attack or identify a configuration mistake on the device.

Check Content

Review the router interface firewall filters to verify all deny statements are logged. At a minimum, all discarding filter terms must have the "syslog" action enabled.

Verify all discarding firewall filter terms are configured with (minimally) the "syslog" action:
[edit firewall]
family inet {
    filter <filter name> {
        term <name> {
            from {
                <match conditions>;
            }
            then {
                log;
                syslog; <<< Must be enabled for local and external syslog.
                discard;
            }
        }
    }
}
family inet6 {
    filter <filter name> {
        term <name> {
            from {
                <match conditions>;
            }
            then {
                log;
                syslog; <<< Must be enabled for local and external syslog.
                discard;
            }
        }
    }
}

If packets being dropped are not logged, this is a finding.