Title

The Juniper router must be configured to use encryption for routing protocol authentication. (Cat II impact)

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 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. OSPF Example: protocols { … … … ospf { area 0.0.0.0 { interface ge-0/0/0 { authentication { md5 1 key "$8$NHVb2mPQ3nCYg/t"; ## SECRET-DATA } } interface ge-0/1/0 { authentication { md5 1 key "$8$Lgb7NbHkPTQnVwF/"; ## SECRET-DATA } } interface lo0.0; interface ge-0/2/0 { authentication { md5 1 key "$8$7DdVY.mTF39s26A"; ## SECRET-DATA } } } } } IS-IS Example: security { … … … } authentication-key-chains { key-chain ISIS_KEY { key 1 { secret "$8$W8oXxdji.f5F-VQn"; ## SECRET-DATA start-time "2018-5-1.12:00:00 +0000"; algorithm hmac-sha-1; options isis-enhanced; } key 2 { secret "$8$Q4953nCrlMLX-9A7V"; ## SECRET-DATA start-time "2018-9-1.12:00:00 +0000"; algorithm hmac-sha-1; options isis-enhanced; } key 3 { secret "$8$UeiHmpu1Ehr.PSe"; ## SECRET-DATA start-time "2019-1-1.12:00:00 +0000"; algorithm hmac-sha-1; options isis-enhanced; } } } } protocols { … … … isis { level 1 authentication-key-chain ISIS_KEY; level 2 authentication-key-chain ISIS_KEY; interface ge-0/0/0 { level 1 hello-authentication-key-chain ISIS_KEY; level 2 hello-authentication-key-chain ISIS_KEY; } interface lo0.0; } BGP Example: security { … … … } authentication-key-chains { key-chain BGP_KEY { key 1 { secret "$8$PTQnhclvMX3687"; ## SECRET-DATA start-time "2018-5-1.12:00:00 +0000"; } key 2 { secret "$8$iq.5OBESyKfTlM"; ## SECRET-DATA start-time "2018-9-1.12:00:00 +0000"; } key 3 { secret "$8$ZADjqAtOIRSk.hr"; ## SECRET-DATA start-time "2019-1-1.12:00:00 +0000"; } } protocols { bgp { group AS_2 { type external; peer-as 2; neighbor 11.1.25.2 { authentication-algorithm md5; authentication-key-chain BGP_KEY; } neighbor 11.1.1.1 { authentication-algorithm hmac-sha-1-96; authentication-key-chain BGP_KEY; } } } If the routing protocol is not encrypting the authentication key, this is a finding.

Fix Text

Configure all routing protocol authentications to encrypt the authentication key. OSPF Example: [edit protocols ospf area 0.0.0.0] set interface ge-0/0/0 authentication md5 1 key xxxxxxxxxxxx set interface ge-0/1/0 authentication md5 1 key xxxxxxxxxxxx set interface ge-0/2/0 authentication md5 1 key xxxxxxxxxxxx IS-IS Example: [edit security authentication-key-chains] set key-chain ISIS_KEY key 1 options isis-enhanced set key-chain ISIS_KEY key 2 options isis-enhanced set key-chain ISIS_KEY key 3 options isis-enhanced set key-chain ISIS_KEY key 1 start-time 2018-05-01.12:00 algorithm hmac-sha-1 secret xxxxxxxxxxxxx set key-chain ISIS_KEY key 2 start-time 2018-09-01.12:00 algorithm hmac-sha-1 secret xxxxxxxxxxxxx set key-chain ISIS_KEY key 3 start-time 2019-01-01.12:00 algorithm hmac-sha-1 secret xxxxxxxxxxxxx [edit protocols] set isis level 1 authentication-key-chain ISIS_KEY set isis interface ge-0/0/0 level 1 hello-authentication-key-chain ISIS_KEY set isis interface ge-0/0/0 level 2 hello-authentication-key-chain ISIS_KEY BGP Example: [edit security authentication-key-chains] set key-chain BGP_KEY key 1 start-time 2018-05-01.12:00 secret xxxxxxxxxxxxx set key-chain BGP_KEY key 2 start-time 2018-09-01.12:00 secret xxxxxxxxxxxxx set key-chain BGP_KEY key 3 start-time 2019-01-01.12:00 secret xxxxxxxxxxxxx [edit protocols bgp group AS_5] set neighbor 11.1.25.5 authentication-algorithm hmac-sha-1-96 set neighbor 11.1.25.5 authentication-key-chain BGP_KEY set neighbor 11.1.1.1 authentication-algorithm hmac-sha-1-96 set neighbor 11.1.1.1 authentication-key-chain BGP_KEY

Additional Identifiers

Rule ID: SV-217014r604135_rule

Vulnerability ID: V-217014

Group Title: SRG-NET-000168-RTR-000077

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.