STIGQter: STIG Summary: Network Infrastructure Policy Security Technical Implementation Guide Version: 9 Release: 10 Benchmark Date: 24 Jan 2020:

Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) report messages must be filtered to allow hosts to join only those multicast groups that have been approved by the organization.

DISA Rule

SV-80871r1_rule

Vulnerability Number

V-66381

Group Title

NET2013

Rule Version

NET2013

Severity

CAT III

CCI(s)

• CCI-001414 - The information system enforces approved authorizations for controlling the flow of information between interconnected systems based on organization-defined information flow control policies.

Weight

10

Fix Recommendation

Configure the Designated Router (DR) to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) report messages to allow tenant hosts to join only those multicast groups that have been approved by the organization.

Check Contents

Review the configuration of the DR to verify that it is filtering IGMP or MLD report messages allowing hosts to only join those groups that have been approved by the organization.

If the DR is not filtering IGMP or MLD report messages, this is a finding.

The following is a PIM sparse mode configuration example filtering specific multicast groups as defined in access-list 11 on the LAN-facing interface.

ip multicast-routing
!
interface FastEthernet 0/0
description link to core
ip address 192.168.123.2 255.255.255.0
ip pim sparse-mode
!
interface FastEthernet 0/1
description User LAN
ip address 192.168.122.1 255.255.255.0
ip pim sparse-mode
ip igmp access-group 11
!
access-list 11 permit 224.10.10.0 0.0.0.255
access-list 11 permit 224.11.11.0 0.0.0.255
access-list 11 permit 224.20.20.0 0.0.0.255

Vulnerability Number

V-66381

Documentable

False

Rule Version

NET2013

Severity Override Guidance

Review the configuration of the DR to verify that it is filtering IGMP or MLD report messages allowing hosts to only join those groups that have been approved by the organization.

If the DR is not filtering IGMP or MLD report messages, this is a finding.

The following is a PIM sparse mode configuration example filtering specific multicast groups as defined in access-list 11 on the LAN-facing interface.

ip multicast-routing
!
interface FastEthernet 0/0
description link to core
ip address 192.168.123.2 255.255.255.0
ip pim sparse-mode
!
interface FastEthernet 0/1
description User LAN
ip address 192.168.122.1 255.255.255.0
ip pim sparse-mode
ip igmp access-group 11
!
access-list 11 permit 224.10.10.0 0.0.0.255
access-list 11 permit 224.11.11.0 0.0.0.255
access-list 11 permit 224.20.20.0 0.0.0.255

Check Content Reference

M

Target Key

838

Comments