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 source-active multicast advertisements to external MSDP peers to avoid global visibility of local-only multicast sources and groups.

DISA Rule

SV-253980r843973_rule

Vulnerability Number

V-253980

Group Title

SRG-NET-000018-RTR-000008

Rule Version

JUEX-RT-000080

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

Ensure an export policy is implemented on all MSDP routers to avoid global visibility of local multicast (S, G) states.

set protocols msdp peer <address> export 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 export policy to block local source-active multicast advertisements.

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

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

Review the policy-statement referenced by the source-active filters and verify that MSDP source-active messages being sent to MSDP peers do not leak advertisements that are local.

[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 export policy to block local source-active multicast advertisements, this is a finding.

Vulnerability Number

V-253980

Documentable

False

Rule Version

JUEX-RT-000080

Severity Override Guidance

Review the router configuration to determine if there is export policy to block local source-active multicast advertisements.

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

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

Review the policy-statement referenced by the source-active filters and verify that MSDP source-active messages being sent to MSDP peers do not leak advertisements that are local.

[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 export policy to block local source-active multicast advertisements, this is a finding.

Check Content Reference

M

Target Key

5479