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The NSX-T Tier-0 Gateway must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-251744T0RT-3X-000003SV-251744r810116_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
VMware NSX-T Tier-0 Gateway RTR Security Technical Implementation Guide2022-09-01

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-251744r810116_chk)

If the Tier-0 Gateway is not using eBGP, this is Not Applicable. From the NSX-T Manager web interface, go to Networking >> Tier-0 Gateways. For every Tier-0 Gateway, expand Tier-0 Gateway >>BGP. Near to BGP Neighbors, click on the number present to open the dialog. For each neighbor examine any router filters to determine if any inbound route filters are applied. If the In Filter is not configured with a prefix list that rejects prefixes belonging to the local AS, this is a finding.

Fix Text (F-55135r810115_fix)

To configure a route filter do the following: From the NSX-T Manager web interface, go to Networking >> Tier-0 Gateways >> edit the target Tier-0 gateway. Expand Routing and open the IP Prefix List dialog. Edit an existing, or add a new prefix list that contains the prefixes belonging to the local AS to deny them. Click "Save". To apply a route filter to a BGP neighbor do the following: From the NSX-T Manager web interface, go to Networking >> Tier-0 Gateways and edit the target Tier-0 gateway. Expand BGP, and next to BGP Neighbors, click on the number present to open the dialog. Select "Edit" on the target BGP Neighbor. Open the router filter dialog and add or edit an existing router filter. Configure the In Filter with the filter previously created and click "Save", "Add", "Apply", and "Save".