STIGQter 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 packets containing an extension header with the Endpoint Identification option.

DISA Rule

SV-230154r538603_rule

Vulnerability Number

V-230154

Group Title

SRG-NET-000364-RTR-000204

Rule Version

CISC-RT-000396

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the router to drop IPv6 packets containing an option type values of 0x8A (Endpoint Identification) regardless of whether it appears in a Hop-by-Hop or Destination Option header 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 any any dest-option-type 138 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
RP/0/0/CPU0:R3(config-if)# end

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is compliant with this requirement.

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 containing an extension header with the Endpoint Identification option as shown in the example below.

ipv6 access-list FILTER_IPV6
10 deny any any dest-option-type 138 log
20 permit ipv6 …



90 deny ipv6 any any log

If the router is not configured to drop IPv6 packets containing an extension header with the Endpoint Identification option, this is a finding.

Vulnerability Number

V-230154

Documentable

False

Rule Version

CISC-RT-000396

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if it is compliant with this requirement.

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 containing an extension header with the Endpoint Identification option as shown in the example below.

ipv6 access-list FILTER_IPV6
10 deny any any dest-option-type 138 log
20 permit ipv6 …



90 deny ipv6 any any log

If the router is not configured to drop IPv6 packets containing an extension header with the Endpoint Identification option, this is a finding.

Check Content Reference

M

Target Key

4029

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