The out-of-band management (OOBM) Arista gateway router must be configured to block any traffic destined to itself that is not sourced from the OOBM network or the NOC.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256024	ARST-RT-000430	SV-256024r882414_rule		Medium

Description
If the gateway router is not a dedicated device for the OOBM network, several safeguards must be implemented for containment of management and production traffic boundaries. It is imperative that hosts from the managed network are not able to access the OOBM gateway router.

STIG	Date
Arista MLS EOS 4.2x Router Security Technical Implementation Guide	2023-01-17

Details

Check Text ( C-59700r882412_chk )
This requirement is not applicable for the DODIN backbone. Review the access control list (ACL) or filter for the router receive path. Verify only traffic sourced from the OOBM network or the NOC is allowed to access the router. Note: If the platform does not support the receive path filter, verify all non-OOBM interfaces have an ingress ACL to restrict access to that interface address or any of the router's loopback addresses to only traffic sourced from the management network. An exception would be to allow packets destined to these interfaces used for troubleshooting, such as ping and traceroute. Step 1: To verify the ACL is configured, execute "show ip access-list OOBM_ACL". Step 2: Determine the NOC management network subnet, which is 172.16.12.0/24. Step 3: Verify the ACL restricts all management plane traffic. ip access-list OOBM_ACL permit tcp 192.168.10.0/24 any eq ssh permit udp host 172.16.12.42 any eq snmp permit udp host 172.16.12.41 any eq ntp permit icmp 172.16.12.0/24 any deny ip any any log Step 4: To verify the ACL is applied ingress on the OOBM interface, execute the command "sh run int Eth YY". interface ethernet 1 description LAN link ip access-group OOBM_ACL in If the Arista router does not block any traffic destined to itself that is not sourced from the OOBM network or the NOC, this is a finding.

Check Text ( C-59700r882412_chk )

This requirement is not applicable for the DODIN backbone.

Review the access control list (ACL) or filter for the router receive path.

Verify only traffic sourced from the OOBM network or the NOC is allowed to access the router.

Note: If the platform does not support the receive path filter, verify all non-OOBM interfaces have an ingress ACL to restrict access to that interface address or any of the router's loopback addresses to only traffic sourced from the management network. An exception would be to allow packets destined to these interfaces used for troubleshooting, such as ping and traceroute.

Step 1: To verify the ACL is configured, execute "show ip access-list OOBM_ACL".

Step 2: Determine the NOC management network subnet, which is 172.16.12.0/24.

Step 3: Verify the ACL restricts all management plane traffic.

ip access-list OOBM_ACL
permit tcp 192.168.10.0/24 any eq ssh
permit udp host 172.16.12.42 any eq snmp
permit udp host 172.16.12.41 any eq ntp
permit icmp 172.16.12.0/24 any
deny ip any any log

Step 4: To verify the ACL is applied ingress on the OOBM interface, execute the command "sh run int Eth YY".

interface ethernet 1
description LAN link
ip access-group OOBM_ACL in

If the Arista router does not block any traffic destined to itself that is not sourced from the OOBM network or the NOC, this is a finding.

Fix Text (F-59643r882413_fix)
This requirement is not applicable for the DODIN backbone. Ensure traffic from the managed network is not able to access the OOBM gateway router using either receive path or interface ingress ACLs. Step 1: Configure the ACL to restrict all management plane traffic. ip access-list OOBM_ACL permit tcp 192.168.10.0/24 any eq ssh permit udp host 172.16.12.42 any eq snmp permit udp host 172.16.12.41 any eq ntp permit icmp 172.16.12.0/24 any deny ip any any log Step 2: Apply the ACL ingress. Execute the command "sh run int Eth YY". interface ethernet 1 description LAN link ip access-group OOBM_ACL in

Fix Text (F-59643r882413_fix)

This requirement is not applicable for the DODIN backbone.

Ensure traffic from the managed network is not able to access the OOBM gateway router using either receive path or interface ingress ACLs.

Step 1: Configure the ACL to restrict all management plane traffic.

ip access-list OOBM_ACL
permit tcp 192.168.10.0/24 any eq ssh
permit udp host 172.16.12.42 any eq snmp
permit udp host 172.16.12.41 any eq ntp
permit icmp 172.16.12.0/24 any
deny ip any any log

Step 2: Apply the ACL ingress. Execute the command "sh run int Eth YY".

interface ethernet 1
description LAN link
ip access-group OOBM_ACL in