Detections
Analytics

JUEX-RT-000080 - 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.

Information

To avoid global visibility of local information, there are a number of source-group (S, G) states in a PIM-SM domain that must not be leaked to another domain, such as multicast sources with private address, administratively scoped multicast addresses, and the auto-RP groups (224.0.1.39 and 224.0.1.40).

Allowing a multicast distribution tree, local to the core, to extend beyond its boundary could enable local multicast traffic to leak into other autonomous systems and customer networks.

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

Solution

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

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Juniper_EX_Switches_Y26M01_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|III, CCI|CCI-001368, Rule-ID|SV-253980r843973_rule, STIG-ID|JUEX-RT-000080, Vuln-ID|V-253980

Plugin: Juniper

Control ID: a55296db20ba06f9c7b739f1ef7b0a5e9a826a483aee8e780bba5cff4c01955d