STIGQter STIGQter: STIG Summary: Arista MLS EOS 4.X Router Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 02 Apr 2025:

The Arista perimeter router must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.

DISA Rule

SV-256040r882462_rule

Vulnerability Number

V-256040

Group Title

SRG-NET-000364-RTR-000109

Rule Version

ARST-RT-000610

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

This requirement is not applicable for the DODIN backbone.

Configure the Arista router to allow only incoming communications from authorized sources to be routed to authorized destinations, such as the example shown below.

LEAF-1A(config-acl-AUTHORIZED_SOURCES)# permit ip 10.1.12.0/24 any
LEAF-1A(config-acl-AUTHORIZED_SOURCES)# deny ip 1.2.3.0/24 any log
LEAF-1A(config-acl-AUTHORIZED_SOURCES)#exit

LEAF-1A(config)#interface ethernet 3
LEAF-1A(config-if-Et3)# ip access-group AUTHORIZED_SOURCES in

Check Contents

This requirement is not applicable for the DODIN backbone.

Review the Arista router configuration to determine if the router allows only incoming communications from authorized sources to be routed to authorized destinations.

Step 1: Verify the ACL is defined as in the following example.

Execute the command "sh ip access-list".

ip access-list AUTHORIZED_SOURCES
permit ip 10.1.12.0/24 any
deny ip 1.2.3.0/24 any log

Step 2: Verify the ACL is applied inbound on the external interface.

interface ethernet 3
ip access-group AUTHORIZED_SOURCES in

If the Arista router does not restrict incoming communications to allow only authorized sources and destinations, this is a finding.

Vulnerability Number

V-256040

Documentable

False

Rule Version

ARST-RT-000610

Severity Override Guidance

This requirement is not applicable for the DODIN backbone.

Review the Arista router configuration to determine if the router allows only incoming communications from authorized sources to be routed to authorized destinations.

Step 1: Verify the ACL is defined as in the following example.

Execute the command "sh ip access-list".

ip access-list AUTHORIZED_SOURCES
permit ip 10.1.12.0/24 any
deny ip 1.2.3.0/24 any log

Step 2: Verify the ACL is applied inbound on the external interface.

interface ethernet 3
ip access-group AUTHORIZED_SOURCES in

If the Arista router does not restrict incoming communications to allow only authorized sources and destinations, this is a finding.

Check Content Reference

M

Target Key

5513