DISA STIGS Viewer

The Dell OS10 multicast router must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.

Overview

Finding ID Version Rule ID IA Controls Severity
V-269858 OS10-RTR-000140 SV-269858r1051959_rule   Medium
Description
PIM is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infrastructure. PIM traffic must be limited to only known PIM neighbors by configuring and binding a PIM neighbor filter to those interfaces that have PIM enabled. If a PIM neighbor filter is not applied to those interfaces that have PIM enabled, unauthorized routers can join the PIM domain, discover and use the rendezvous points, and also advertise their rendezvous points into the domain. This can result in a denial of service by traffic flooding or result in the unauthorized transfer of data.
STIG Date
Dell OS10 Switch Router Security Technical Implementation Guide 2024-12-11

Details

Check Text (C-73891r1051957_chk)
This requirement is not applicable for the DODIN Backbone.

Review the multicast topology diagram and determine if router interfaces are enabled for IPv4 or IPv6 multicast routing.

If the router is enabled for multicast routing, verify all interfaces enabled for PIM have a neighbor filter bound to the interface. The neighbor filter must only accept PIM control plane traffic from the documented PIM neighbors.

Step 1: Verify that a PIM neighbor filter has been configured.

!
ip access-list PIM_NBR_FILTER
seq 10 permit ip 10.10.10.2/32 any

Step 2: Verify all interfaces enabled for PIM have the neighbor filter bound to the interface.

!
interface vlan100
no shutdown
ip pim sparse-mode
ip pim neighbor-filter PIM_NBR_FILTER

If PIM neighbor filters are not bound to all interfaces that have PIM enabled, this is a finding.
Fix Text (F-73792r1051958_fix)
This requirement is not applicable for the DODIN Backbone.

Configure neighbor filters to only accept PIM control plane traffic from documented PIM neighbors. Bind neighbor filters to all PIM enabled interfaces.

Step 1: Configure an ACL that only permits documented neighbors.

OS10(config)# ip access-list PIM_NBR_FILTER
OS10(config-ipv4-acl)# permit ip 10.10.10.2/32 any

Step 2: Apply the ACL to the PIM interfaces.

OS10(config)# interface vlan 100
OS10(conf-if-vl-100)# ip pim neighbor-filter PIM_NBR_FILTER