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

The Arista BGP router must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.

DISA Rule

SV-255992r945854_rule

Vulnerability Number

V-255992

Group Title

SRG-NET-000018-RTR-000006

Rule Version

ARST-RT-000060

Severity

CAT III

CCI(s)

• CCI-000032 - Enforce information flow control using organization-defined security policy filters as a basis for flow control decisions for organization-defined information flows.

Weight

10

Fix Recommendation

Configure all Arista ASBR routers to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute.

LEAF-1A(config)#router bgp 65001
LEAF-1A(config-router-bgp)#bgp enforce-first-as

Check Contents

The feature below is enabled by default.

Verify the BGP configuration to deny the updates received from eBGP peer that do not have the proper AS in the AS_PATH_attribute. To verify the BGP config and that the feature is applied, execute the command "show run all | in first".

router bgp 65001
bgp enforce-first-as

If the router is not configured for "enforce-first-as", this is a finding.

Vulnerability Number

V-255992

Documentable

False

Rule Version

ARST-RT-000060

Severity Override Guidance

The feature below is enabled by default.

Verify the BGP configuration to deny the updates received from eBGP peer that do not have the proper AS in the AS_PATH_attribute. To verify the BGP config and that the feature is applied, execute the command "show run all | in first".

router bgp 65001
bgp enforce-first-as

If the router is not configured for "enforce-first-as", this is a finding.

Check Content Reference

M

Target Key

5513