The network device must log all access control lists (ACL) deny statements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3000	NET1020	SV-15475r3_rule	ECAT-1 ECAT-2 ECSC-1	Low

Description
Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done, attempted to be done, and by whom in order 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.

STIG	Date
Perimeter Router Security Technical Implementation Guide Juniper	2017-06-29

Details

Check Text ( C-12941r3_chk )
Review the network device interface ACLs to verify all deny statements are logged. Either the syslog or log action command will satisfy this requirement. JUNOS Example: [edit firewall] family inet { filter NIPRNet-ingress { term first-accept { from { } then accept; } term last-accept { from { destination-address { 131.77.5.32/32; 131.77.5.61/32; } protocol tcp; destination-port http; } then accept; } term default-action { then { syslog; discard; } } } }

Check Text ( C-12941r3_chk )

Review the network device interface ACLs to verify all deny statements are logged.

Either the syslog or log action command will satisfy this requirement.

JUNOS Example:
[edit firewall]
family inet {
filter NIPRNet-ingress {
term first-accept {
from {
}
then accept;
}
term last-accept {
from {
destination-address {
131.77.5.32/32;
131.77.5.61/32;
}
protocol tcp;
destination-port http;
}
then accept;
}
term default-action {
then {
syslog;
discard;
}
}
}
}

Fix Text (F-3025r4_fix)
Configure interface ACLs to log all deny statements.