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The Juniper 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.


Overview

Finding ID Version Rule ID IA Controls Severity
V-253994 JUEX-RT-000220 SV-253994r844015_rule Low
Description
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.
STIG Date
Juniper EX Series Switches Router Security Technical Implementation Guide 2024-06-10

Details

Check Text ( C-57446r844013_chk )
Verify that the RP router is configured to filter PIM register messages from unauthorized multicast groups and sources.
[edit policy-options]
policy-statement {
term filter_groups {
from {
route-filter / orlonger;
route-filter / exact;

}
then reject;
}
term filter_sources {
from {
source-address-filter /32 exact;
source-address-filter / orlonger;

}
then reject;
}
term accept_others {
then accept;
}
}

[edit protocols pim]
rp {
rp-register-policy ;
}

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 (F-57397r844014_fix)
Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.

set policy-options policy-statement term filter_groups from route-filter /
set policy-options policy-statement term filter_groups from route-filter /
set policy-options policy-statement term filter_groups then reject

set policy-options policy-statement term filter_source from source-address-filter /
set policy-options policy-statement term filter_source from source-address-filter /
set policy-options policy-statement term filter_source then reject

set policy-options policy-statement term accept_others then accept

set protocols pim rp rp-register-policy