The Arista perimeter router must be configured to block all outbound management traffic.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256044	ARST-RT-000650	SV-256044r882474_rule		Medium

Description
For in-band management, the management network must have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes, such as routers and firewalls. Management traffic between the managed network elements and the management network is routed via the same links and nodes as that used for production or operational traffic. Safeguards must be implemented to ensure that the management traffic does not leak past the perimeter of the managed network.

Description

For in-band management, the management network must have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes, such as routers and firewalls. Management traffic between the managed network elements and the management network is routed via the same links and nodes as that used for production or operational traffic. Safeguards must be implemented to ensure that the management traffic does not leak past the perimeter of the managed network.

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

Details

Check Text ( C-59720r882472_chk )
This requirement is not applicable for the DODIN backbone. The Arista perimeter router of the managed network must be configured with an access control list (ACL) or filter on the egress interface to block all management traffic. Step 1: To verify the configuration is blocking all outbound traffic destined to management network, execute the command "sh ip access-list". ip access-list FILTER_MANAGEMENT_SUBNET deny ip any 172.20.1.0 0.0.0.255 log permit ip any any Step 2: To verify the filter is applied on egress interface, execute the command "sh run int ethernet YY". interface ethernet 3 ip access-group FILTER_MANAGEMENT_SUBNET out If management traffic is not blocked at the perimeter, this is a finding.

Check Text ( C-59720r882472_chk )

This requirement is not applicable for the DODIN backbone.

The Arista perimeter router of the managed network must be configured with an access control list (ACL) or filter on the egress interface to block all management traffic.

Step 1: To verify the configuration is blocking all outbound traffic destined to management network, execute the command "sh ip access-list".

ip access-list FILTER_MANAGEMENT_SUBNET
deny ip any 172.20.1.0 0.0.0.255 log
permit ip any any

Step 2: To verify the filter is applied on egress interface, execute the command "sh run int ethernet YY".

interface ethernet 3
ip access-group FILTER_MANAGEMENT_SUBNET out

If management traffic is not blocked at the perimeter, this is a finding.

Fix Text (F-59663r882473_fix)
This requirement is not applicable for the DODIN backbone. Configure the Arista perimeter router of the managed network with an ACL or filter on the egress interface to block all outbound management traffic. Step 1: Configure the filter to block all outbound traffic destined to the management network. LEAF-1A(config-if-Et3)#ip access-list FILTER_MANAGEMENT_SUBNET LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)# deny ip any 172.20.1.0 0.0.0.255 log LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)# permit ip any any Step 2: Apply the filter egress on the interface. LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)#interface ethernet 3 LEAF-1A(config-if-Et3)#ip access-group FILTER_MANAGEMENT_SUBNET out

Fix Text (F-59663r882473_fix)

This requirement is not applicable for the DODIN backbone.

Configure the Arista perimeter router of the managed network with an ACL or filter on the egress interface to block all outbound management traffic.

Step 1: Configure the filter to block all outbound traffic destined to the management network.

LEAF-1A(config-if-Et3)#ip access-list FILTER_MANAGEMENT_SUBNET
LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)# deny ip any 172.20.1.0 0.0.0.255 log
LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)# permit ip any any

Step 2: Apply the filter egress on the interface.

LEAF-1A(config-acl-FILTER_MANAGEMENT_SUBNET)#interface ethernet 3
LEAF-1A(config-if-Et3)#ip access-group FILTER_MANAGEMENT_SUBNET out