STIGQter STIGQter: STIG Summary: Cisco IOS-XE Switch RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Apr 2021:

The Cisco perimeter switch must be configured to drop IPv6 packets containing an extension header with the Endpoint Identification option.

DISA Rule

SV-237774r648815_rule

Vulnerability Number

V-237774

Group Title

SRG-NET-000364-RTR-000204

Rule Version

CISC-RT-000396

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the switch 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.

SW1(config)#ipv6 access-list FILTER_IPV6
SW1(config-ipv6-acl)#deny any any dest-option-type 138 log
SW1(config-ipv6-acl)#permit ipv6 …



SW1(config-ipv6-acl)# deny ipv6 any any log
SW1(config-ipv6-acl)#exit
SW1(config)#int g1/0
SW1(config-if)#ipv6 traffic-filter FILTER_IPV6
SW1(config-if)#end

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the switch 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 gigabitethernet1/0
ipv6 address 2001::1:0:22/64
ipv6 traffic-filter FILTER_IPV6 in


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
deny any any dest-option-type 138 log
permit ipv6 …



deny ipv6 any any log


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

Vulnerability Number

V-237774

Documentable

False

Rule Version

CISC-RT-000396

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the switch 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 gigabitethernet1/0
ipv6 address 2001::1:0:22/64
ipv6 traffic-filter FILTER_IPV6 in


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
deny any any dest-option-type 138 log
permit ipv6 …



deny ipv6 any any log


If the switch 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

4074

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