The Juniper 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.

From Juniper Router RTR Security Technical Implementation Guide

Associated with: CCI-001958

JUNI-RT-000640_rule The Juniper 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.

Vulnerability discussion

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.

Check content

Review the router configuration to determine if LDP messages are being authenticated for the targeted LDP sessions. In the example below, the PE router is LDP peering with remote PE 8.8.8.8. ldp { interface ge-0/1/0.0; interface ge-0/1/1.0; session 8.8.8.8 { authentication-algorithm hmac-sha-1-96; authentication-key-chain LDP_KEY; } } If authentication is not being used for the LDP targeted sessions using a FIPS-approved message authentication code algorithm, this is a finding.

Fix text

Implement authentication for all targeted LDP sessions using a FIPS-approved message authentication code algorithm. [edit security authentication-key-chains] set key-chain LDP_KEY key 1 start-time 2018-05-01.12:00 secret xxxxxxxxxxxxx set key-chain LDP_KEY key 2 start-time 2018-09-01.12:00 secret xxxxxxxxxxxxx set key-chain LDP_KEY key 3 start-time 2019-01-01.12:00 secret xxxxxxxxxxxxx [edit protocols ldp] set session 8.8.8.8 authentication-algorithm hmac-sha-1-96 authentication-key-chain LDP_KEY

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.