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

The Arista router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.

DISA Rule

SV-256034r882444_rule

Vulnerability Number

V-256034

Group Title

SRG-NET-000362-RTR-000115

Rule Version

ARST-RT-000550

Severity

CAT II

CCI(s)

• CCI-002385 - Protect against or limit the effects of organization-defined types of denial of service events.

Weight

10

Fix Recommendation

Step 1: Disable ICMP redirects on all external interfaces.

ip access-group DENY_REDIRECT
deny icmp any any redirect
permit ip any any

Step 2: Apply the ACL outbound on interfaces.

interface Ethernet 2
description EXTERNAL INTERFACE
ip access-group DENY_REDIRECT in

Check Contents

Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP Redirect messages out to any external interfaces.

Step 1: To verify the ACL is configured to determine the router does not send ICMP Redirect messages out to any external interfaces, execute the command "sh ip access-list".

ip access-group DENY_REDIRECT
deny icmp any any redirect
permit ip any any

Step 2: To verify the ACL is applied outbound on interface, execute the command "sh run int Eth YY".

interface Ethernet 2
ip access-group DENY_REDIRECT out

If ICMP Redirect messages are enabled on any external interfaces, this is a finding.

Vulnerability Number

V-256034

Documentable

False

Rule Version

ARST-RT-000550

Severity Override Guidance

Review the device configuration to determine if controls have been defined to ensure the router does not send ICMP Redirect messages out to any external interfaces.

Step 1: To verify the ACL is configured to determine the router does not send ICMP Redirect messages out to any external interfaces, execute the command "sh ip access-list".

ip access-group DENY_REDIRECT
deny icmp any any redirect
permit ip any any

Step 2: To verify the ACL is applied outbound on interface, execute the command "sh run int Eth YY".

interface Ethernet 2
ip access-group DENY_REDIRECT out

If ICMP Redirect messages are enabled on any external interfaces, this is a finding.

Check Content Reference

M

Target Key

5513