Title

The RUCKUS ICX Router 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. (Cat II impact)

Discussion

The current multicast paradigm can let any host join any multicast group at any time by sending an IGMP or MLD membership report to the DR. In a Protocol Independent Multicast (PIM) Sparse Mode network, the DR will send a PIM Join message for the group to the RP. Without any form of admission control, this can pose a security risk to the entire multicast domain - specifically the multicast routers along the shared tree from the DR to the RP that must maintain the mroute state information for each group join request. Hence, it is imperative that the DR is configured to limit the number of mroute state information that must be maintained to mitigate the risk of IGMP or MLD flooding.

Check Content

View the "show default value" output for the pim-hw-cache and pim6-hw-cache values. If either number is zero, this is a finding.

Fix Text

Configure the "system-max pim-hw-cache" and "system-max pim6-hw-cache" values to be above zero. (Reboot may be required to take effect.) ICX(config)#system-max pim-hw-cache 256 ICX(config)#system-max pim6-hw-cache 256

Additional Identifiers

Rule ID: SV-273639r1110942_rule

Vulnerability ID: V-273639

Group Title: SRG-NET-000362-RTR-000122

Expert Comments

CCIs tied to check.

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