The multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-207118
SRG-NET-000019-RTR-000013
SV-207118r604135_rule
Low
Description
Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast packets, over-using the available bandwidth and thereby creating a denial-of-service (DoS) condition. Hence, it is imperative that register messages are accepted only for authorized multicast groups and sources.
Verify that the RP router is configured to filter PIM register messages.
If the RP router peering with PIM-SM routers is not configured with a PIM import policy to block registration messages for any undesirable multicast groups and sources, this is a finding.
Fix Text (F-7379r382248_fix)
Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.