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JUNI-RT-000850 - The Juniper multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization - protocols igmp

Information

Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download 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.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Configure the DR to filter the IGMP and MLD report messages to allow hosts to join only those multicast groups that have been approved.

Configure a multicast join policy to filter groups that have not been approved as shown in the example below.

[edit policy-options policy-statement MULTICAST_JOIN_POLICY]
set term BAD_GROUPS from route-filter 224.1.1.0/24 orlonger
set term BAD_GROUPS from route-filter 225.1.2.3/32 exact
set term BAD_GROUPS from route-filter 239.0.0.0/8 orlonger
set term BAD_GROUPS then reject
set term ALLOW_APPROVED then accept

Apply the policy to all interfaces enabled for IGMP.

[edit protocols igmp]
set interface ge-1/0/1.0 group-policy MULTICAST_JOIN_POLICY

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_Router_Y25M01_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7(11), CAT|III, CCI|CCI-002403, Rule-ID|SV-217089r878058_rule, STIG-ID|JUNI-RT-000850, STIG-Legacy|SV-101171, STIG-Legacy|V-90961, Vuln-ID|V-217089

Plugin: Juniper

Control ID: a2bb33f2a7bb9bd05b3e1ce30d3d934ea0aae146a7a7d422881a15f72e7cb5a1