STIGQter: STIG Summary: Cisco IOS XR Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

The Cisco multicast Designated Router (DR) must be configured to limit the number of mroute states resulting from Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Host Membership Reports.

DISA Rule

SV-216816r531087_rule

Vulnerability Number

V-216816

Group Title

SRG-NET-000362-RTR-000122

Rule Version

CISC-RT-000880

Severity

CAT II

CCI(s)

• CCI-002385 - The information system protects against or limits the effects of organization-defined types of denial of service attacks by employing organization-defined security safeguards.

Weight

10

Fix Recommendation

Configure the DR on a global or interface basis to limit the number of mroute states resulting from IGMP or MLD membership reports.

RP/0/0/CPU0:R5(config)#router igmp
RP/0/0/CPU0:R2(config-igmp)#maximum groups 200
RP/0/0/CPU0:R5(config-igmp)#end

Check Contents

Review the DR configuration to verify that it is limiting the number of mroute states via IGMP or MLD.

Verify IGMP limits have been configured globally or on each host-facing interface via the ip igmp limit command as shown in the example.

router igmp
interface GigabitEthernet0/0/0/0
access-group IGMP_JOIN_FILTER
!
interface GigabitEthernet0/0/0/1
access-group IGMP_JOIN_FILTER
!
maximum groups 200

!Note: After the maximum groups value is met, all additional memberships learned are ignored. If not configured, the default is 5000 which would be an overage for a small to average size multicast deployment.

If the DR is not limiting multicast join requests via IGMP or MLD on a global or interfaces basis, this is a finding.

Vulnerability Number

V-216816

Documentable

False

Rule Version

CISC-RT-000880

Severity Override Guidance

Review the DR configuration to verify that it is limiting the number of mroute states via IGMP or MLD.

Verify IGMP limits have been configured globally or on each host-facing interface via the ip igmp limit command as shown in the example.

router igmp
interface GigabitEthernet0/0/0/0
access-group IGMP_JOIN_FILTER
!
interface GigabitEthernet0/0/0/1
access-group IGMP_JOIN_FILTER
!
maximum groups 200

!Note: After the maximum groups value is met, all additional memberships learned are ignored. If not configured, the default is 5000 which would be an overage for a small to average size multicast deployment.

If the DR is not limiting multicast join requests via IGMP or MLD on a global or interfaces basis, this is a finding.

Check Content Reference

M

Target Key

4029

Comments