The Cisco IOS XE router must enable neighbor router authentication for control plane protocols.

From Cisco IOS XE Release 3 RTR Security Technical Implementation Guide

Part of SRG-NET-000025-RTR-000020

Associated with: CCI-000366 CCI-002205

SV-88793r2_rule The Cisco IOS XE router must enable neighbor router authentication for control plane protocols.

Vulnerability discussion

A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect or even a rogue destination. This diverted traffic could be analyzed to learn confidential information about the site's network, or merely used to disrupt the network's ability to communicate with other networks. This is known as a "traffic attraction attack" and is prevented by configuring neighbor router authentication for routing updates.This requirement applies to all IPv4 and IPv6 protocols that are used to exchange routing or packet forwarding information; this includes all Interior Gateway Protocols (such as OSPF, EIGRP, and IS-IS) and Exterior Gateway Protocols (such as BGP), MPLS-related protocols (such as LDP), and Multicast-related protocols.

Check content

Review the Cisco IOS XE router configuration and verify that neighbor router authentication is configured for all control plane protocols. The configuration should look similar to the examples below: OSPF Example: router ospf 1 area 1 authentication message-digest interface GigabitEthernet0/0 ip ospf message-digest-key 1 md5 BGP Example: router bgp 65001 bgp log-neighbor-changes neighbor 2200:31:3::1 remote-as 65000 neighbor 2200:31:3::1 password neighbor 200.31.3.1 remote-as 65000 neighbor 200.31.3.1 password If authentication is not enabled, this is a finding.

Fix text

Configure neighbor router authentication for all control plane protocols. The configuration will look similar to the example below: OSPF Example: router ospf 1 area 1 authentication message-digest interface GigabitEthernet0/0 ip ospf message-digest-key 1 md5 BGP Example: router bgp 65001 bgp log-neighbor-changes neighbor 2200:31:3::1 remote-as 65000 neighbor 2200:31:3::1 password neighbor 200.31.3.1 remote-as 65000 neighbor 200.31.3.1 password

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