Finding ID | Version | Rule ID | IA Controls | Severity |
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V-216722 | CISC-RT-000840 | SV-216722r531086_rule | Low |
Description |
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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 join messages are only accepted for authorized multicast groups. |
STIG | Date |
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Cisco IOS XE Router RTR Security Technical Implementation Guide | 2023-02-28 |
Check Text ( C-17955r288108_chk ) |
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Verify that the RP router is configured to filter PIM join messages for any undesirable multicast groups. In the example below, groups from 239.8.0.0/16 are not allowed. ip pim rp-address 10.2.2.2 ip pim accept-rp 10.2.2.2 FILTER_PIM_JOINS … … … ip access-list standard FILTER_PIM_JOINS deny 239.8.0.0 0.0.255.255 permit any ! If the RP is not configured to filter join messages received from the DR for any undesirable multicast groups, this is a finding. |
Fix Text (F-17953r288109_fix) |
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Configure the RP to filter PIM join messages for any undesirable multicast groups as shown in the example below: R2(config)#ip access-list standard PIM_JOIN_FILTER R2(config-std-nacl)#deny 239.8.0.0 0.0.255.255 R2(config-std-nacl)#permit any R2(config-std-nacl)#exit R2(config)#ip pim accept-rp 10.2.2.2 PIM_JOIN_FILTER R2(config)#end |