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 restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field via egress filter or by enabling Unicast Reverse Path Forwarding (uRPF).

DISA Rule

SV-256026r945858_rule

Vulnerability Number

V-256026

Group Title

SRG-NET-000205-RTR-000014

Rule Version

ARST-RT-000450

Severity

CAT I

CCI(s)

• CCI-001094 - Restrict the ability of individuals to launch organization-defined denial of service attacks against other systems.

Weight

10

Fix Recommendation

This requirement is not applicable for the DODIN backbone.

Configure the Arista router to ensure an egress filter or uRPF is configured to restrict the router from accepting any outbound IP packet that contains an external IP address in the source field.

LEAF-1A(config)#interface Ethernet3/17/1
LEAF-1A(config)#ip address 172.16.43.3/24
LEAF-1A(config)#ip verify unicast source reachable-via rx

Check Contents

This requirement is not applicable for the DODIN backbone.

Review the router configuration to verify uRPF or an egress filter has been configured on all internal interfaces to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field.

To verify restrict uRPF is configured on the interface to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field, execute the command "sh run int eth YY".

interface Ethernet3/17/1
ip address 172.16.43.3/24
ip verify unicast source reachable-via rx

If uRPF or an egress filter to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field has not been configured on all internal interfaces, this is a finding.

Vulnerability Number

V-256026

Documentable

False

Rule Version

ARST-RT-000450

Severity Override Guidance

This requirement is not applicable for the DODIN backbone.

Review the router configuration to verify uRPF or an egress filter has been configured on all internal interfaces to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field.

To verify restrict uRPF is configured on the interface to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field, execute the command "sh run int eth YY".

interface Ethernet3/17/1
ip address 172.16.43.3/24
ip verify unicast source reachable-via rx

If uRPF or an egress filter to restrict the router from accepting outbound IP packets that contain an illegitimate address in the source address field has not been configured on all internal interfaces, this is a finding.

Check Content Reference

M

Target Key

5513