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The Cisco router must be configured to use encryption for routing protocol authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-216554 | CISC-RT-000040 | SV-216554r892362_rule | Medium |
| Description |
|---|
| 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. |
| STIG | Date |
|---|---|
| Cisco IOS Router RTR Security Technical Implementation Guide | 2023-02-17 |
Details
| Check Text ( C-17789r892360_chk ) |
|---|
| Review the router configuration. For every routing protocol that affects the routing or forwarding tables, verify that neighbor router authentication is encrypting the authentication key as shown in the examples below. BGP Example router bgp nn no synchronization bgp log-neighbor-changes neighbor x.x.x.x remote-as nn neighbor x.x.x.x password xxxxxxx Note: BGP authentication uses MD5 EIGRP Example interface GigabitEthernet1/0 ip address x.x.x.x 255.255.255.0 ip authentication mode eigrp 1 md5 ip authentication key-chain eigrp 1 EIGRP_KEY_CHAIN IS-IS Example interface GigabitEthernet1/0 ip address x.x.x.x 255.255.255.0 ip router isis isis authentication mode md5 isis authentication key-chain ISIS_KEY_CHAIN OSPF Example key chain OSPF_KEY_CHAIN key 1 key-string xxxxxxx cryptographic-algorithm hmac-sha-256 … … … interface GigabitEthernet0/1 ip address x.x.x.x 255.255.255.0 ip ospf authentication key-chain OSPF_KEY_CHAIN RIP Example interface GigabitEthernet1/0 ip rip authentication mode md5 ip rip authentication key-chain RIP_KEY_CHAIN If the routing protocol is not encrypting the authentication key, this is a finding. |
| Fix Text (F-17785r892361_fix) |
|---|
| Configure all routing protocol authentications to encrypt the authentication key. BGP Example R1(config)#router bgp nn R1(config-router)#neighbor x.x.x.x password xxxxxx EIGRP Example R2(config)#int g0/1 R2(config-if)#ip authentication mode eigrp 1 md5 R2(config-if)#ip authentication key-chain eigrp 1 EIGRP_KEY_CHAIN IS-IS Example R5(config)#int g0/1 R5(config-if)#isis authentication mode md5 R5(config-if)#isis authentication key-chain ISIS_KEY_CHAIN OSPF Example R5(config)#key chain OSPF_KEY_CHAIN R5(config-keychain)#key 1 R5(config-keychain-key)#key-string xxxxxx R5(config-keychain-key)#cryptographic-algorithm hmac-sha-256 R5(config-keychain-key)#exit R5(config-keychain-key)#end R5(config)#interface GigabitEthernet0/2 R5(config-if)#ip ospf authentication key-chain OSPF_KEY_CHAIN RIP Example R2(config)#int g1/0 R2(config-if)#ip rip authentication mode md5 R2(config-if)#ip rip authentication key-chain RIP_KEY_CHAIN |