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 drop IPv6 packets with a Routing Header type 0, 1, or 3–255.

DISA Rule

SV-230052r533196_rule

Vulnerability Number

V-230052

Group Title

SRG-NET-000364-RTR-000201

Rule Version

CISC-RT-000393

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 packets with Routing Header of type 0, 1, or 3-255 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)# permit ipv6 any host 2001:DB8::0:1:1:1234 routing-type 2
RP/0/0/CPU0:R3(config-ipv6-acl)# deny ipv6 any any routing log
RP/0/0/CPU0:R3(config-ipv6-acl)# permit …
…
…
…
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 packets containing a Routing Header of type 0, 1, or 3-255.

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 IPv6 packets with a Routing Header type 0, 1, or 3-255
as shown in the example below.

ipv6 access-list FILTER_IPV6
10 permit ipv6 any host 2001:DB8::1:1:1234 routing-type 2
20 deny ipv6 any any log routing
30 permit ipv6 …
…
…
…
90 deny ipv6 any any log

Note: The example above allows routing-type 2 in the event Mobility IPv6 is deployed.

If the router is not configured to drop IPv6 packets containing a Routing Header of type 0, 1, or 3-255, this is a finding.

Vulnerability Number

V-230052

Documentable

False

Rule Version

CISC-RT-000393

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 packets containing a Routing Header of type 0, 1, or 3-255.

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 IPv6 packets with a Routing Header type 0, 1, or 3-255
as shown in the example below.

ipv6 access-list FILTER_IPV6
10 permit ipv6 any host 2001:DB8::1:1:1234 routing-type 2
20 deny ipv6 any any log routing
30 permit ipv6 …
…
…
…
90 deny ipv6 any any log

Note: The example above allows routing-type 2 in the event Mobility IPv6 is deployed.

If the router is not configured to drop IPv6 packets containing a Routing Header of type 0, 1, or 3-255, this is a finding.

Check Content Reference

M

Target Key

4029

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