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 enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.

DISA Rule

SV-255997r882333_rule

Vulnerability Number

V-255997

Group Title

SRG-NET-000019-RTR-000002

Rule Version

ARST-RT-000110

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the router to enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.

To use an IP access list to fulfill this function, enter the following commands, substituting organizational values for the bracketed variables.

ip access-list [name]
[permit/deny] [protocol] [source address] [source port] [destination address] [destination port]
exit

interface [type] [number]
ip access-group [name] [direction]

Check Contents

Verify each Arista router enforces approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.

This requirement may be met through the use of IP access control lists.

Step 1: To verify on the Arista router that IP access lists are configured, execute the "show ip access-lists summary" command and check that the list is configured and is active on applicable interfaces.

router:#show ip access-lists summary
IPV4 ACL $$bgp-ttlSec-ip-vrf-default$$ [dynamic]
Total rules configured: 1
Configured on Ingress: bgp(default VRF)
Active on Ingress: bgp(default VRF)

IPV4 ACL ACL
Total rules configured: 1

Standard IPV4 ACL ALLOWED_SOURCES
Total rules configured: 2

IPV4 ACL AUTHORIZED_SOURCES
Total rules configured: 3

Step 2: To verify the Arista router lists that control the flow of information in accordance with organizational policy, enter the "show ip access-list [name]" command and review the associated permit and deny statements.

IP Access List ACL.
router#show ip access-list AUTHORIZED_SOURCES
IP Access List AUTHORIZED_SOURCES
10 permit ip 10.1.12.0/24 any
20 deny ip 1.2.3.0/24 any log
30 deny ip host 10.11.12.2 any log

If the Arista router does not enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy, this is a finding.

Vulnerability Number

V-255997

Documentable

False

Rule Version

ARST-RT-000110

Severity Override Guidance

Verify each Arista router enforces approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.

This requirement may be met through the use of IP access control lists.

Step 1: To verify on the Arista router that IP access lists are configured, execute the "show ip access-lists summary" command and check that the list is configured and is active on applicable interfaces.

router:#show ip access-lists summary
IPV4 ACL $$bgp-ttlSec-ip-vrf-default$$ [dynamic]
Total rules configured: 1
Configured on Ingress: bgp(default VRF)
Active on Ingress: bgp(default VRF)

IPV4 ACL ACL
Total rules configured: 1

Standard IPV4 ACL ALLOWED_SOURCES
Total rules configured: 2

IPV4 ACL AUTHORIZED_SOURCES
Total rules configured: 3

Step 2: To verify the Arista router lists that control the flow of information in accordance with organizational policy, enter the "show ip access-list [name]" command and review the associated permit and deny statements.

IP Access List ACL.
router#show ip access-list AUTHORIZED_SOURCES
IP Access List AUTHORIZED_SOURCES
10 permit ip 10.1.12.0/24 any
20 deny ip 1.2.3.0/24 any log
30 deny ip host 10.11.12.2 any log

If the Arista router does not enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy, this is a finding.

Check Content Reference

M

Target Key

5513