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The Arista BGP router must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-255989ARST-RT-000030SV-255989r882309_ruleCCI-001368medium
Description
Accepting route advertisements belonging to the local AS can result in traffic looping or being black holed, or at a minimum using a non-optimized path.
STIGDate
Arista MLS EOS 4.X Router Security Technical Implementation Guide2025-02-20

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (17) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AST-04Network Diagrams & Data Flow Diagrams (DFDs)
1.00
AST-04.2Control Applicability Boundary Graphical Representation
1.00
CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
DCH-01Data Protection
1.00
DCH-19Geographic Location of Data
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
IAC-21Least Privilege
1.00

+7 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (42) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-2(1)Automated System Account Management
1.00
AC-2(10)Shared and Group Account Credential Change
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(7)Role-based Access Control
1.00
AC-4Information Flow Enforcement
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00
AC-6(9)Log Use of Privileged Functions
1.00

+32 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.1.3
1.00
CCI1 mapping
CCI-001368
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (4) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-09
1.00
ID.AM-03
1.00
PR.DS-10
1.00
PR.IR-01
1.00

Who does this work

18 NICE work roles and 10 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-255989r882309_chk)

Review the Arista router configuration to verify that it will reject routes belonging to the local AS. The prefix filter must be referenced inbound on the appropriate BGP neighbor statements. Step 1: Review the prefix lists configured on the router to filter the local AS prefix (10.12.0.0/16). To verify IP prefix lists are configured, execute the command "show ip prefix-list". router#sh ip prefix-list router#ip prefix-list LOCAL_SCOPE_BOUNDARY seq 10 deny 10.12.0.0/16 seq 100 permit 0.0.0.0/0 le32 Step 2: Review the BGP configuration to verify the prefix filter is applied inbound to the BGP neighbor. To verify the BGP config and verify the prefix is applied, execute the command "show run | section router bgp". router bgp 65000 router-id 10.11.11.11 address-family ipv4 no neighbor 10.11.12.2 prefix-list out neighbor 10.12.0.0 prefix-list LOCAL_SCOPE_BOUNDARY in If the Arista router is not configured to reject inbound route advertisements belonging to the local AS, this is a finding.

Fix Text (F-59608r882308_fix)

Configure Arista eBGP routers to reject inbound route advertisements for prefixes that are not allocated to that specific customer. Step 1: Configure the prefix-list to reject inbound route advertisements belonging to the local AS. router(config)#ip prefix-list LOCAL_SCOPE_BOUNDARY router(config-ip-pfx)#seq 10 deny 10.12.0.0/16 router(config-ip-pfx)#seq 100 permit 0.0.0.0/0 le32 Step 2: Configure a route-map to match the prefix-list. router(config)#route-map LOCAL_AS deny router(config-route-map-LOCAL_AS)#match IP address prefix-list LOCAL_SCOPE_BOUNDARY router(config-route-map-LOCAL_AS)#exit Step 3: Configure the route-map to be applied inbound to the appropriate BGP neighbor. router(config)#router bgp 65000 router(config-router-bgp)#neighbor 10.12.0.0 prefix-list LOCAL_SCOPE_BOUNDARY in