The Arista Multilayer Switch must authenticate all endpoint devices before establishing a network connection using bidirectional authentication that is cryptographically based.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-60825	AMLS-L2-000130	SV-75281r1_rule		Medium

Description
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity on the network. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk (e.g., remote connections). Bidirectional authentication solutions include, but are not limited to, IEEE 802.1x and Extensible Authentication Protocol (EAP) and Radius server with EAP-Transport Layer Security (TLS) authentication. A network connection is any connection with a device that communicates through a network (e.g., local area network, wide area network, or the Internet). Authentication must use a form of cryptography to ensure a high level of trust and authenticity.

Description

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity on the network. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk (e.g., remote connections). Bidirectional authentication solutions include, but are not limited to, IEEE 802.1x and Extensible Authentication Protocol (EAP) and Radius server with EAP-Transport Layer Security (TLS) authentication. A network connection is any connection with a device that communicates through a network (e.g., local area network, wide area network, or the Internet). Authentication must use a form of cryptography to ensure a high level of trust and authenticity.

STIG	Date
Arista MLS DCS-7000 Series L2S Security Technical Implementation Guide	2018-11-28

Details

Check Text ( C-61771r1_chk )
Verify that the network device uniquely identifies network-connected endpoint devices. This requirement is not applicable to Arista switches when not used as an access switch. 802.1X must be configured on any interface where there is an applicable endpoint device connected. This is demonstrated by viewing the running-config via the "show dot1x all" command and validating the following lines are present in the configuration: Dot1X Information for Ethernet[X] -------------------------------------------- PortControl : auto HostMode : single-host QuietPeriod : [value] TxPeriod : [value] ReauthPeriod : 3600 seconds MaxReauthReq : 2 ! 802.1X must also be globally enabled on the switch using the "dot1x system-auth-control" command from the configuration mode interface. When this is configured, the following line will be visible in the running-config: dot1x-system-auth-control 802.1X is dependent on a properly configured RADIUS server for authentication. Refer to the RADIUS configuration example for validation of properly configured AAA services. Additionally, the user must specify to use the RADIUS server as an 802.1X authenticator with the "aaa authentication dot1x default group [radius]" command from the configuration mode interface, replacing the bracketed variable with either the group name of the RADIUS server group, or leaving it as is to authenticate against all RADIUS servers. When properly configured, the following line is visible in the running-config: aaa authentication dot1x default group radius If 802.1X is not configured on necessary ports, or is not globally enabled on the switch, or if it is not set to authenticate supplicants via RADIUS, this is a finding.

Check Text ( C-61771r1_chk )

Verify that the network device uniquely identifies network-connected endpoint devices. This requirement is not applicable to Arista switches when not used as an access switch.

802.1X must be configured on any interface where there is an applicable endpoint device connected. This is demonstrated by viewing the running-config via the "show dot1x all" command and validating the following lines are present in the configuration:

Dot1X Information for Ethernet[X]
--------------------------------------------
PortControl : auto
HostMode : single-host
QuietPeriod : [value]
TxPeriod : [value]
ReauthPeriod : 3600 seconds
MaxReauthReq : 2

!

802.1X must also be globally enabled on the switch using the "dot1x system-auth-control" command from the configuration mode interface. When this is configured, the following line will be visible in the running-config:

dot1x-system-auth-control

802.1X is dependent on a properly configured RADIUS server for authentication. Refer to the RADIUS configuration example for validation of properly configured AAA services. Additionally, the user must specify to use the RADIUS server as an 802.1X authenticator with the "aaa authentication dot1x default group [radius]" command from the configuration mode interface, replacing the bracketed variable with either the group name of the RADIUS server group, or leaving it as is to authenticate against all RADIUS servers. When properly configured, the following line is visible in the running-config:

aaa authentication dot1x default group radius

If 802.1X is not configured on necessary ports, or is not globally enabled on the switch, or if it is not set to authenticate supplicants via RADIUS, this is a finding.

Fix Text (F-66535r1_fix)
Configure 802.1X on the switch, using the following mandatory parameters for all applicable interfaces. Replace the bracketed variable with the applicable value. config interface Ethernet[X] switchport access vlan [Y] dot1x pae authenticator dot1x reauthentication dot1x port-control auto dot1x host-mode single-host dot1x timeout quiet-period [value] dot1x timeout reauth-period [value] dot1x max-reauth-req [value] For the global configuration, include the following command statements from the global configuration mode interface: logging level DOT1X informational aaa authentication dot1x default group radius dot1x system-auth-control

Fix Text (F-66535r1_fix)

Configure 802.1X on the switch, using the following mandatory parameters for all applicable interfaces. Replace the bracketed variable with the applicable value.

config
interface Ethernet[X]
switchport access vlan [Y]
dot1x pae authenticator
dot1x reauthentication
dot1x port-control auto
dot1x host-mode single-host
dot1x timeout quiet-period [value]
dot1x timeout reauth-period [value]
dot1x max-reauth-req [value]

For the global configuration, include the following command statements from the global configuration mode interface:

logging level DOT1X informational
aaa authentication dot1x default group radius
dot1x system-auth-control