STIGQter: STIG Summary: Cisco IOS XR Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

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

DISA Rule

SV-216761r531087_rule

Vulnerability Number

V-216761

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

This requirement is not applicable for the DODIN Backbone.

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

RP/0/0/CPU0:R3(config)#int g0/0/0/1
RP/0/0/CPU0:R3(config-if)#ipv4 access-group EXTERNAL_ACL_INBOUND in
RP/0/0/CPU0:R3(config-if)#end

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to verify that an inbound ACL is configured on all external interfaces as shown in the example below.
interface GigabitEthernet0/0/0/1
ipv4 address x.11.1.2 255.255.255.252
ipv4 access-group EXTERNAL_ACL_INBOUND ingress

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

Vulnerability Number

V-216761

Documentable

False

Rule Version

CISC-RT-000330

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to verify that an inbound ACL is configured on all external interfaces as shown in the example below.
interface GigabitEthernet0/0/0/1
ipv4 address x.11.1.2 255.255.255.252
ipv4 access-group EXTERNAL_ACL_INBOUND ingress

If the router 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

4029

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