V-269868

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 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. However, using clear-text authentication provides little benefit since an attacker can intercept traffic and view the authentication key. This would allow the attacker to use the authentication key in an attack. 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 router configuration.

For every protocol that affects the routing or forwarding tables (where information is exchanged between neighbors), verify that neighbor router authentication is encrypting the authentication key.

Verify the routing protocols are configured to use encryption 

!
interface vlan400
 ipv6 ospf 10 area 0.0.0.1
 ipv6 ospf authentication ipsec spi 4017 sha1 1234567890123456789012345678901234567890
 ...
 ip ospf 1 area 0.0.0.1
 ip ospf message-digest-key 1 md5 1234567812345678

If authentication is not encrypting the authentication key, this is a finding.