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The Dell OS10 BGP router must be configured to reject inbound route advertisements from a customer edge (CE) router for prefixes that are not allocated to that customer.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-269852OS10-RTR-000040SV-269852r1051941_ruleCCI-001368medium
Description
As a best practice, a service provider should only accept customer prefixes that have been assigned to that customer and any peering autonomous systems. A multihomed customer with BGP speaking routers connected to the internet or other external networks could be breached and used to launch a prefix deaggregation attack. Without ingress route filtering of customers, the effectiveness of such an attack could impact the entire IP core and its customers.
STIGDate
Dell OS10 Switch Router Security Technical Implementation Guide2024-12-11

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-269852r1051941_chk)

Review the router configuration to verify that there are filters defined to only accept routes for prefixes that belong to specific customers. The prefix filter must be referenced inbound on the appropriate BGP neighbor statement. Step 1: Verify prefix lists have been configured for each customer containing prefixes that belong to that customer. OS10# show running-configuration prefix-list ! ... ip prefix-list PREFIX_FILTER_CUST1 seq 5 permit 50.10.10.0/24 le 32 ip prefix-list PREFIX_FILTER_CUST1 seq 10 deny 0.0.0.0/0 ge 8 ip prefix-list PREFIX_FILTER_CUST2 seq 5 permit 60.10.10.0/24 le 32 ip prefix-list PREFIX_FILTER_CUST2 seq 10 deny 0.0.0.0/0 ge 8 ... Step 2: Verify the route map applied to the external neighbors references the configured prefix list shown above. OS10# show running-configuration route-map ! route-map PREFIX_FILTER_CUST1_MAP permit 50 match ip address prefix-list PREFIX_FILTER_CUST1 ! route-map PREFIX_FILTER_CUST2_MAP permit 60 match ip address prefix-list PREFIX_FILTER_CUST2 ! Step 3: Verify the route map applied to the external neighbors references the appropriate route maps shown above. ! router bgp 10 ! neighbor 50.1.1.1 ! address-family ipv4 unicast route-map PREFIX_FILTER_CUST1_MAP in neighbor 60.1.1.1 ! address-family ipv4 unicast route-map PREFIX_FILTER_CUST2_MAP in If the router is not configured to reject inbound route advertisements from each CE router for prefixes that are not allocated to that customer, this is a finding.

Fix Text (F-73786r1051940_fix)

Configure all eBGP routers to reject inbound route advertisements from a CE router for prefixes that are not allocated to that customer. Step 1: Configure a prefix list for each customer containing prefixes belonging to each. OS10(config)# ip prefix-list PREFIX_FILTER_CUST1 seq 5 permit 50.10.10.0/24 le 32 OS10(config)# ip prefix-list PREFIX_FILTER_CUST1 seq 10 deny 0.0.0.0/0 ge 8 OS10(config)# ip prefix-list PREFIX_FILTER_CUST2 seq 5 permit 60.10.10.0/24 le 32 OS10(config)# ip prefix-list PREFIX_FILTER_CUST2 seq 10 deny 0.0.0.0/0 ge 8 Step 2: Configure the route map referencing the configured prefix list. OS10(config)# route-map PREFIX_FILTER_CUST1_MAP 50 OS10(config-route-map)# match ip address prefix-list PREFIX_FILTER_CUST1 OS10(config-route-map)# exit OS10(config)# route-map PREFIX_FILTER_CUST2_MAP 50 OS10(config-route-map)# match ip address prefix-list PREFIX_FILTER_CUST2 OS10(config-route-map)# exit Step 3: Apply the route-map inbound to each external BGP neighbor. OS10(config)# router bgp 10 OS10(config-router-bgp-10)# neighbor 50.1.1.1 OS10(config-router-neighbor)# address-family ipv4 unicast OS10(config-router-bgp-neighbor-af)# route-map PREFIX_FILTER_CUST1_MAP in OS10(config-router-bgp-neighbor-af)# exit OS10(config-router-neighbor)# exit OS10(config-router-bgp-10)# neighbor 60.1.1.1 OS10(config-router-neighbor)# address-family ipv4 unicast OS10(config-router-bgp-neighbor-af)# route-map PREFIX_FILTER_CUST2_MAP in OS10(config-router-bgp-neighbor-af)# exit OS10(config-router-neighbor)# exit OS10(config-router-bgp-10)# exit