The PE router providing MPLS Layer 2 Virtual Private Network (L2VPN) services must be configured to authenticate targeted Label Distribution Protocol (LDP) sessions used to exchange virtual circuit (VC) information using a FIPS-approved message authentication code algorithm.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207147	SRG-NET-000343-RTR-000001	SV-207147r856631_rule		Medium

Description

LDP provides the signaling required for setting up and tearing down pseudowires (virtual circuits used to transport Layer 2 frames) across an MPLS IP core network. Using a targeted LDP session, each PE router advertises a virtual circuit label mapping that is used as part of the label stack imposed on the frames by the ingress PE router during packet forwarding. Authentication provides protection against spoofed TCP segments that can be introduced into the LDP sessions.

STIG	Date
Router Security Requirements Guide	2024-05-28

Details

Check Text (C-7408r382424_chk)

Review the router configuration to determine if LDP messages are being authenticated for the targeted LDP sessions.

If authentication is not being used for the LDP sessions using a FIPS-approved message authentication code algorithm, this is a finding.

Fix Text (F-7408r382425_fix)

Implement authentication for all targeted LDP sessions using a FIPS-approved message authentication code algorithm.