Detections
Analytics

1.82 CISC-RT-000810

Information

The Cisco multicast edge router must be configured to establish boundaries for administratively scoped multicast traffic.

GROUP ID: V-216809RULE ID: SV-216809r531087

If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel.

Administrative scoped multicast addresses are locally assigned and are to be used exclusively by the enterprise network or enclave. Administrative scoped multicast traffic must not cross the enclave perimeter in either direction. Restricting multicast traffic makes it more difficult for a malicious user to access sensitive traffic.

Admin-Local scope is encouraged for any multicast traffic within a network intended for network management, as well as for control plane traffic that must reach beyond link-local destinations.

Solution

Step 1: Configure the ACL to deny packets with multicast administratively scoped destination addresses as shown in the example below.

RP/0/0/CPU0:R2(config)#Ipv4 access-list MULTICAST_SCOPERP/0/0/CPU0:R2(config-ipv4-acl)#deny 239.0.0.0 0.255.255.255RP/0/0/CPU0:R2(config-ipv4-acl)#permit any

Step 2: Apply the multicast boundary at the appropriate interfaces as shown in the example below.

RP/0/0/CPU0:R2(config)#multicast-routingRP/0/0/CPU0:R2(config-mcast)#address-family ipv4RP/0/0/CPU0:R2(config-mcast-default-ipv4)#int g0/0/0/1RP/0/0/CPU0:R2(config-mcast-default-ipv4-if)#boundary MULTICAST_SCOPERP/0/0/CPU0:R2(config-mcast-default-ipv4-if)#end

See Also

https://workbench.cisecurity.org/benchmarks/23599

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|III, CCI|CCI-001414, Rule-ID|SV-216809r531087_rule, STIG-ID|CISC-RT-000810, Vuln-ID|V-216809

Plugin: Cisco

Control ID: 4ba6fbd8db17aea601ea5a5fa68652f38a03c49ca1ee0edce2cf25938d282bb4