The Arista Multilayer Switch must authenticate 802.1X connected devices before establishing any connection.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-60831	AMLS-L2-000160	SV-75287r1_rule		Medium

Description
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of authentication claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide authentication decisions (as opposed to the actual authenticators) to the services that need to act on those decisions. This requirement applies to applications that connect either locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers (outside a datacenter), VoIP Phones, and VTC CODECs). Gateways and SOA applications are examples of where this requirement would apply. Device authentication is a solution enabling an organization to manage devices. It is an additional layer of authentication ensuring only specific pre-authorized devices can access the system.

Description

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of authentication claims may be made by services separate from the services acting on those decisions. In such situations, it is necessary to provide authentication decisions (as opposed to the actual authenticators) to the services that need to act on those decisions. This requirement applies to applications that connect either locally, remotely, or through a network to an endpoint device (including, but not limited to, workstations, printers, servers (outside a datacenter), VoIP Phones, and VTC CODECs). Gateways and SOA applications are examples of where this requirement would apply. Device authentication is a solution enabling an organization to manage devices. It is an additional layer of authentication ensuring only specific pre-authorized devices can access the system.

STIG	Date
Arista MLS DCS-7000 Series L2S Security Technical Implementation Guide	2016-03-29

Details

Check Text ( C-61777r1_chk )
This requirement only applies to devices required to employ 802.1X. 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-61777r1_chk )

This requirement only applies to devices required to employ 802.1X.

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-66541r1_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 3600 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-66541r1_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 3600
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