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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3000	NET1020	SV-50941r1_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
Firewall Security Technical Implementation Guide - Cisco	2017-12-07

Details

Check Text ( C-46492r1_chk )

Review the network device interface ACLs to verify all deny statements are logged. interface GigabitEthernet0/0 description To Outside Router nameif outside security-level 0 ip address 173.x.x.x 255.x.x.x ipv6 nd suppress-ra access-group outside_access_in in interface outside ... access-list outside_access_in extended deny ip 172.16.0.0 255.240.0.0 any log access-list outside_access_in extended deny ip 10.0.0.0 255.0.0.0 any log access-list outside_access_in extended deny ip 192.168.0.0 255.255.0.0 any log access-list outside_access_in extended deny ip 127.0.0.0 0.0.0.0 any log ... access-list outside_access_in extended deny ip any any log

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