The Arista Multilayer Switch must encrypt all methods of configured authentication for the OSPF routing protocol.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-60919	AMLS-L3-000250	SV-75377r1_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 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. 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.

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 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. 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
Arista MLS DCS-7000 Series RTR Security Technical Implementation Guide	2015-07-06

Details

Check Text ( C-61865r1_chk )
Review the router configuration for the following configuration statement under the interface configuration for any interface participating in the OSPF topology: ip ospf authentication message-digest ip ospf message-digest-key [number] md5 [type] [key] For IPv6 Authentication, the following statements must be present under the ipv6 router ospf configuration statement, or on any interface running OSPFv3: area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key] If either of these statements are not present, OSPF is not using encryption for authentication, and this is a finding.

Check Text ( C-61865r1_chk )

Review the router configuration for the following configuration statement under the interface configuration for any interface participating in the OSPF topology:
ip ospf authentication message-digest
ip ospf message-digest-key [number] md5 [type] [key]

For IPv6 Authentication, the following statements must be present under the ipv6 router ospf configuration statement, or on any interface running OSPFv3:
area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

If either of these statements are not present, OSPF is not using encryption for authentication, and this is a finding.

Fix Text (F-66631r1_fix)
Configure routing protocol authentication to encrypt the authentication key via the following commands under the interface configuration mode: ip ospf authentication message-digest ip ospf message-digest-key [number] md5 [type] [key] For IPv6 global configuration, enter: ipv6 router ospf {process number} area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key] Alternatively, under the interface configuration mode, enter: ipv6 ospf area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

Fix Text (F-66631r1_fix)

Configure routing protocol authentication to encrypt the authentication key via the following commands under the interface configuration mode:
ip ospf authentication message-digest
ip ospf message-digest-key [number] md5 [type] [key]

For IPv6 global configuration, enter:
ipv6 router ospf {process number}
area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]

Alternatively, under the interface configuration mode, enter:
ipv6 ospf area [area number] authentication ipsec spi [spi number] [md5/sha1] [passphrase/key] [0/7] [passphrase/key]