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 drop IPv6 undetermined transport packets.

DISA Rule

SV-230049r533189_rule

Vulnerability Number

V-230049

Group Title

SRG-NET-000364-RTR-000200

Rule Version

CISC-RT-000392

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

Configure the router to drop IPv6 undetermined transport packets as shown in the example below.
RP/0/0/CPU0:R3(config)# ipv6 access-list FILTER_IPV6
RP/0/0/CPU0:R3(config-ipv6-acl)# deny ipv6 any any undetermined-transport log
RP/0/0/CPU0:R3(config-ipv6-acl)# permit ipv6 …
…
…
…
RP/0/0/CPU0:R3(config-ipv6-acl)# deny ipv6 any any log
RP/0/0/CPU0:R3(config-ipv6-acl)# exit
RP/0/0/CPU0:R3(config)# interface gigabitethernet 0/2/0/2
RP/0/0/CPU0:R3(config-if)# ipv6 access-group FILTER_IPV6 ingress

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is configured to drop IPv6 undetermined transport packets.

Step 1: Verify that an inbound IPv6 ACL has been configured on the external interface.

interface interface gigabitethernet 0/2/0/2
ipv6 address 2001::1:0:22/64
ipv6 access-group FILTER_IPV6 ingress

Step 2: Verify that the ACL drops undetermined transport packets as shown in the example below.

ipv6 access-list FILTER_IPV6
10 deny ipv6 any any log undetermined-transport
20 permit ipv6 …
…
…
…
90 deny ipv6 any any log

If the router is not configured to drop IPv6 undetermined transport packets, this is a finding.

Vulnerability Number

V-230049

Documentable

False

Rule Version

CISC-RT-000392

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is configured to drop IPv6 undetermined transport packets.

Step 1: Verify that an inbound IPv6 ACL has been configured on the external interface.

interface interface gigabitethernet 0/2/0/2
ipv6 address 2001::1:0:22/64
ipv6 access-group FILTER_IPV6 ingress

Step 2: Verify that the ACL drops undetermined transport packets as shown in the example below.

ipv6 access-list FILTER_IPV6
10 deny ipv6 any any log undetermined-transport
20 permit ipv6 …
…
…
…
90 deny ipv6 any any log

If the router is not configured to drop IPv6 undetermined transport packets, this is a finding.

Check Content Reference

M

Target Key

4029

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