STIGQter: STIG Summary: Cisco IOS-XE Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco perimeter switch must be configured to filter ingress traffic at the external interface on an inbound direction.

DISA Rule

SV-221013r622190_rule

Vulnerability Number

V-221013

Group Title

SRG-NET-000205-RTR-000004

Rule Version

CISC-RT-000330

Severity

CAT II

CCI(s)

• CCI-001097 - The information system monitors and controls communications at the external boundary of the information system and at key internal boundaries within the system.

Weight

10

Fix Recommendation

Configure the switch to use an inbound ACL on all external interfaces as shown in the example below:

SW1(config)#int g0/2
SW1(config-if)#ip access-group EXTERNAL_ACL_INBOUND in

Check Contents

Review the switch configuration to verify that an inbound ACL is configured on all external interfaces as shown in the example below:

interface GigabitEthernet0/2
ip address x.11.1.2 255.255.255.254
ip access-group EXTERNAL_ACL_INBOUND in

If the switch is not configured to filter traffic entering the network at all external interfaces in an inbound direction, this is a finding.

Vulnerability Number

V-221013

Documentable

False

Rule Version

CISC-RT-000330

Severity Override Guidance

Review the switch configuration to verify that an inbound ACL is configured on all external interfaces as shown in the example below:

interface GigabitEthernet0/2
ip address x.11.1.2 255.255.255.254
ip access-group EXTERNAL_ACL_INBOUND in

If the switch is not configured to filter traffic entering the network at all external interfaces in an inbound direction, this is a finding.

Check Content Reference

M

Target Key

4074

Comments