Title

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. (Cat III impact)

Discussion

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.

Check Content

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

Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.

Additional Identifiers

Rule ID: SV-207118r604135_rule

Vulnerability ID: V-207118

Group Title: SRG-NET-000019

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.