STIGQter: STIG Summary: Juniper Router RTR Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 12 Feb 2021:

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 a multicast group only from sources that have been approved by the organization.

DISA Rule

SV-217090r639663_rule

Vulnerability Number

V-217090

Group Title

SRG-NET-000364-RTR-000115

Rule Version

JUNI-RT-000860

Severity

CAT II

CCI(s)

• CCI-002403 - The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Weight

10

Fix Recommendation

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.

Configure a multicast join policy to filter unauthorized multicast sources.

[edit policy-options policy-statement MULTICAST_JOIN_POLICY]
set term BAD_SOURCES from source-address-filter x.x.x.x/32 exact
set term BAD_SOURCES from source-address-filter x.x.x.x/24 orlonger
set term BAD_SOURCES 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

Check Contents

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.

Verify that a group policy has been configured to filter IGMP join requests as shown in the example below.

protocols {
igmp {
interface ge-1/0/1.0 {
group-policy MULTICAST_JOIN_POLICY;
}
}

Verify that the policy only allows join requests for those sources that have been approved.

policy-options {
…
…
…
}
policy-statement MULTICAST_JOIN_POLICY {
term BAD_SOURCES {
from {
source-address-filter x.x.x.x/32 exact;
source-address-filter x.x.x.x/24 orlonger;
}
then reject;
}
…
…
…
}
term ALLOW_APPROVED {
then accept;
}
}

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

If the DR is not filtering IGMP or MLD report messages to only allow joins for approved sources, this is a finding.

Vulnerability Number

V-217090

Documentable

False

Rule Version

JUNI-RT-000860

Severity Override Guidance

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.

Verify that a group policy has been configured to filter IGMP join requests as shown in the example below.

protocols {
igmp {
interface ge-1/0/1.0 {
group-policy MULTICAST_JOIN_POLICY;
}
}

Verify that the policy only allows join requests for those sources that have been approved.

policy-options {
…
…
…
}
policy-statement MULTICAST_JOIN_POLICY {
term BAD_SOURCES {
from {
source-address-filter x.x.x.x/32 exact;
source-address-filter x.x.x.x/24 orlonger;
}
then reject;
}
…
…
…
}
term ALLOW_APPROVED {
then accept;
}
}

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

If the DR is not filtering IGMP or MLD report messages to only allow joins for approved sources, this is a finding.

Check Content Reference

M

Target Key

4032

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