CISC-RT-000660 - The Cisco PE switch 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.

Information

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 switch advertises a virtual circuit label mapping that is used as part of the label stack imposed on the frames by the ingress PE switch during packet forwarding. Authentication provides protection against spoofed TCP segments that can be introduced into the LDP sessions.

Solution

The severity level can be downgraded to a CAT III if the switch is configured to authenticate targeted LDP sessions using MD5 as shown in the example below:

SW1(config)#mpls ldp neighbor 10.1.1.2 password xxxxxxxx

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS_Switch_Y24M07_STIG.zip

Item Details

Category: IDENTIFICATION AND AUTHENTICATION

References: 800-53|IA-3, CAT|II, CCI|CCI-001958, Rule-ID|SV-220454r864159_rule, STIG-ID|CISC-RT-000660, STIG-Legacy|SV-110763, STIG-Legacy|V-101659, Vuln-ID|V-220454

Plugin: Cisco

Control ID: 491d6859f86e1092e8771a9e71d7680be56626b7d308b2f139ff3e96b96e667a