Multi-Protocol Labeled Switching (MPLS) labels must not be exchanged between the enclaves edge routers and any external neighbor routers.

From Network Infrastructure Policy Security Technical Implementation Guide

Part of NET2001

Associated with: CCI-001097

SV-80845r1_rule Multi-Protocol Labeled Switching (MPLS) labels must not be exchanged between the enclaves edge routers and any external neighbor routers.

Vulnerability discussion

MPLS label exchange via Label Distribution Protocol (LDP) or Resource Reservation Protocol (RSVP) with any external neighbor creates the risk of label spoofing that could disrupt optimum routing, or even drop packets that are encapsulated with a label that is not in the MPLS forwarding table.

Check content

Review the DISN-facing interfaces of the enclave perimeter routers to verify that LDP or RSVP is not enabled. If any of these interfaces are LDP or RSVP enabled, this is a finding.

Fix text

Disable LDP and RSVP on DISN-facing interfaces on all perimeter routers.

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