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The Cisco switch must be configured to implement message authentication for all control plane protocols.


Overview

Finding ID Version Rule ID IA Controls Severity
V-220468 CISC-RT-000020 SV-220468r622190_rule Medium
Description
A rogue switch could send a fictitious routing update to convince a site's perimeter switch 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 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 switch 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.
STIG Date
Cisco IOS Switch RTR Security Technical Implementation Guide 2021-03-19

Details

Check Text ( C-22183r508477_chk )
Review the switch configuration. Verify that authentication is enabled for all routing protocols. The configuration examples below depict OSPF and EIGRP authentication.

EIGRP example:

key chain EIGRP_KEY
key 1
key-string xxxxxxx



interface GigabitEthernet0/0
no switchport
ip address x.x.x.x 255.255.255.0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 EIGRP_KEY

OSPF example:

interface GigabitEthernet0/0
no switchport
ip address x.x.x.x 255.255.255.0
ip ospf authentication-key xxxxx

If authentication is not enabled on all routing protocols, this is a finding.
Fix Text (F-22172r508478_fix)
Configure authentication to be enabled for every protocol that affects the routing or forwarding tables. The example configuration commands below enables OSPF and EIGRP authentication.

EIGRP example:

SW1(config)#key chain EIGRP_KEY
SW1(config-keychain)#key 1
SW1(config-keychain-key)#key-string xxxxx
SW1(config-keychain-key)#exit
SW1(config-keychain)#exit
SW1(config)#int g0/0
SW1(config-if)#ip authentication mode eigrp 1 md5
SW1(config-if)#ip authentication key-chain eigrp 1 EIGRP_KEY
SW1(config-if)#end

OSPF example:

SW1(config)#int g0/0
SW1(config-if)#ip ospf authentication-key xxxxx
SW1(config-if)#end