Title

The RUCKUS ICX multicast Rendezvous Pointerface (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

Check configuration for presence of accept-register filter for PIM: ICX# show ip pim sparse Global PIM Sparse Mode Settings Maximum Mcache : 12288 Current Count : 0 Hello interval : 30 Neighbor timeout : 105 Join/Prune interval : 60 Inactivity interval : 180 Hardware Drop Enabled : Yes Prune Wait Interval : 3 Bootstrap Msg interval : 60 Candidate-RP Msg interval : 60 Register Suppress Time : 60 Register Probe Time : 10 Register Stop Delay : 10 SPT Threshold : 1 SSM Enabled : No Register Rate Limit : 1 pps Register Filter : PIM_REG_FILTER Route Precedence : uc-non-default uc-default mc-non-default mc-default Join/Prune Policy : No Slow Path Disable All : No Slow Path Enable SSM : No Slow Path Filter Acl : None If the RP router peering with PIM-SM routers is not configured with a policy to block registration messages for any undesirable multicast groups and sources, this is a finding.

Fix Text

Configure PIM register filter and apply to PIM configuration: ICX(config)#ip access ext PIM_REG_FILTER ICX(config-ext-ipacl-PIM_REG_FILTER)#deny ip any 239.5.0.0/16 ICX(config-ext-ipacl-PIM_REG_FILTER)#permit ip host 10.1.2.6 any ICX(config-ext-ipacl-PIM_REG_FILTER)#permit ip host x.1.2.7 any ICX(config-ext-ipacl-PIM_REG_FILTER)#deny ip any any ICX(config-ext-ipacl-PIM_REG_FILTER)#exit ICX(config)#router pim ICX(config-pim-router)#rp-addres x.1.1.1 ICX(config-pim-router)#accept-register PIM_REG_FILTER

Additional Identifiers

Rule ID: SV-273590r1110891_rule

Vulnerability ID: V-273590

Group Title: SRG-NET-000019-RTR-000013

Expert Comments

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