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The Juniper multicast Designated Router (DR) must be configured to filter the IGMP and MLD Report messages to allow hosts to join a multicast group only from sources that have been approved by the organization.


Overview

Finding ID Version Rule ID IA Controls Severity
V-254051 JUEX-RT-000790 SV-254051r844263_rule Medium
Description
Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone downloading a file here or there), whereas multicast can have broader impact on bandwidth consumption, resulting in extreme network congestion. Hence, it is imperative that there is multicast admission control to restrict which multicast groups hosts are allowed to join via IGMP or MLD.
STIG Date
Juniper EX Series Switches Router Security Technical Implementation Guide 2023-03-23

Details

Check Text ( C-57503r844184_chk )
Review the configuration of the DR to verify that it is filtering IGMP or MLD report messages, allowing hosts to only join multicast groups from sources that have been approved.

Note: This requirement is only applicable to Source Specific Multicast (SSM) implementation.

[edit policy-options]
policy-statement {
term unauth-sources {
from {
source-address-filter / orlonger;
}
then reject;
}
term allow-others {
then accept;
}
}
policy-statement {
term unauth-sources {
from {
source-address-filter / orlonger;
}
then reject;
}
term allow-others {
then accept;
}
}

[edit protocols]
igmp {
interface / {
group-policy ;
}
}
mld {
interface / {
group-policy ;
}
}

If the DR is not filtering IGMP or MLD report messages, this is a finding.
Fix Text (F-57454r844185_fix)
Configure the DR to filter the IGMP and MLD report messages to allow hosts to join only those multicast groups from sources that have been approved.

set policy-options policy-statement term unauth-sources from source-address-filter / orlonger
set policy-options policy-statement term unauth-sources then reject
set policy-options policy-statement term accept-others then accept

set policy-options policy-statement term unauth-sources from source-address-filter / orlonger
set policy-options policy-statement term unauth-sources then reject
set policy-options policy-statement term accept-others then accept

set protocols igmp interface . group-policy
set protocols mld interface . group-policy