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

The Cisco perimeter router must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.

DISA Rule

SV-216664r531086_rule

Vulnerability Number

V-216664

Group Title

SRG-NET-000364-RTR-000109

Rule Version

CISC-RT-000260

Severity

CAT II

CCI(s)

• CCI-002403 - The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Weight

10

Fix Recommendation

This requirement is not applicable for the DODIN Backbone.

Configure the router to allow only incoming communications from authorized sources to be routed to authorized destinations.

R1(config)#ip access-list extended FILTER_PERIMETER
R1(config-ext-nacl)#nn permit udp host x.12.1.9 host x.12.1.21 eq ntp
R1(config-ext-nacl)#end

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if the router allows only incoming communications from authorized sources to be routed to authorized destinations. The hypothetical example below allows inbound NTP from server x.1.12.9 only to host x.12.1.21.

ip access-list extended FILTER_PERIMETER
permit tcp any any established
…
…
…
permit udp host x.12.1.9 host x.12.1.21 eq ntp
deny ip any any log-input

If the router does not restrict incoming communications to allow only authorized sources and destinations, this is a finding.

Vulnerability Number

V-216664

Documentable

False

Rule Version

CISC-RT-000260

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if the router allows only incoming communications from authorized sources to be routed to authorized destinations. The hypothetical example below allows inbound NTP from server x.1.12.9 only to host x.12.1.21.

ip access-list extended FILTER_PERIMETER
permit tcp any any established
…
…
…
permit udp host x.12.1.9 host x.12.1.21 eq ntp
deny ip any any log-input

If the router does not restrict incoming communications to allow only authorized sources and destinations, this is a finding.

Check Content Reference

M

Target Key

4028

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