STIGQter: STIG Summary: Juniper EX Series Switches Router Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 24 Jul 2024:

The Juniper router configured for Multicast Source Discovery Protocol (MSDP) must filter received source-active multicast advertisements for any undesirable multicast groups and sources.

DISA Rule

SV-253979r843970_rule

Vulnerability Number

V-253979

Group Title

SRG-NET-000018-RTR-000007

Rule Version

JUEX-RT-000070

Severity

CAT III

CCI(s)

• CCI-001368 - Enforce approved authorizations for controlling the flow of information within the system based on organization-defined information flow control policies.

Weight

10

Fix Recommendation

Configure the MSDP router to implement an import policy to block multicast advertisements for undesirable multicast groups and sources.

set protocols msdp peer <address> import source-active-filter

set policy-options policy-statement source-active-filter term unauth-groups from route-filter 224.0.1.2/32 exact
set policy-options policy-statement source-active-filter term unauth-groups from route-filter 224.0.2.2/32 exact
set policy-options policy-statement source-active-filter term unauth-groups then reject
set policy-options policy-statement source-active-filter term unauth-sources from source-address-filter 10.0.0.0/8 orlonger
set policy-options policy-statement source-active-filter term unauth-sources from source-address-filter 127.0.0.0/8 orlonger
set policy-options policy-statement source-active-filter term unauth-sources then reject

Check Contents

Review the router configuration to determine if there is an import policy to block source-active multicast advertisements for any undesirable multicast groups, as well as any (S, G) states with undesirable source addresses.

Verify that an inbound source-active filter is bound to each MSDP peer.

[edit protocols msdp]
peer <address> {
import source-active-filter;
}

Review the policy-statement referenced by the source-active filter to verify that undesirable multicast groups, auto-RP, single source multicast (SSM) groups, and advertisements from undesirable sources are blocked.

[edit policy-options]
policy-statement source-active-filter {
term unauth-groups {
from {
route-filter 224.0.1.2/32 exact;
route-filter 224.0.2.2/32 exact;
}
then reject;
}
term unauth-sources {
from {
source-address-filter 10.0.0.0/8 orlonger;
source-address-filter 127.0.0.0/8 orlonger;
}
then reject;
}
}

If the router is not configured with an import policy to block undesirable SA multicast advertisements, this is a finding.

Vulnerability Number

V-253979

Documentable

False

Rule Version

JUEX-RT-000070

Severity Override Guidance

Review the router configuration to determine if there is an import policy to block source-active multicast advertisements for any undesirable multicast groups, as well as any (S, G) states with undesirable source addresses.

Verify that an inbound source-active filter is bound to each MSDP peer.

[edit protocols msdp]
peer <address> {
import source-active-filter;
}

Review the policy-statement referenced by the source-active filter to verify that undesirable multicast groups, auto-RP, single source multicast (SSM) groups, and advertisements from undesirable sources are blocked.

[edit policy-options]
policy-statement source-active-filter {
term unauth-groups {
from {
route-filter 224.0.1.2/32 exact;
route-filter 224.0.2.2/32 exact;
}
then reject;
}
term unauth-sources {
from {
source-address-filter 10.0.0.0/8 orlonger;
source-address-filter 127.0.0.0/8 orlonger;
}
then reject;
}
}

If the router is not configured with an import policy to block undesirable SA multicast advertisements, this is a finding.

Check Content Reference

M

Target Key

5479