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The Cisco BGP router must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-216781CISC-RT-000530SV-216781r531087_ruleCCI-001097medium
Description
Outbound route advertisements belonging to the core can result in traffic either looping or being black holed, or at a minimum, using a non-optimized path.
STIGDate
Cisco IOS XR Router RTR Security Technical Implementation Guide2024-08-22

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (18) 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.

CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
CRY-01.1Alternate Physical Protection
1.00
CRY-03Transmission Confidentiality
1.00
CRY-04Transmission Integrity
1.00
CRY-05Encrypting Data At Rest
1.00
DCH-01Data Protection
1.00
IAC-21Least Privilege
1.00
MON-01Continuous Monitoring
1.00
MON-01.1Intrusion Detection & Prevention Systems (IDS & IPS)
1.00

+8 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (10) 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.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
SI-4System Monitoring
1.00
SI-4(11)Analyze Communications Traffic Anomalies
1.00
NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) 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.

3.13.1
1.00
3.13.2
1.00
3.13.5
1.00
CCI1 mapping
CCI-001097
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) 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-01
1.00
PR.DS-01
1.00
PR.DS-02
1.00
PR.DS-10
1.00
PR.IR-01
1.00

Who does this work

15 NICE work roles and 9 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-216781r531087_chk)

Step 1: verify that an outbound route policy has been configured for each external neighbor as shown in the example below. router bgp xx address-family ipv4 unicast ! neighbor x.1.23.3 remote-as yy address-family ipv4 unicast route-policy BGP_FILTER_OUTBOUND out ! ! neighbor x.1.24.4 remote-as zz address-family ipv4 unicast route-policy BGP_FILTER_OUTBOUND out ! ! Step 2: Review the route policy to determine if it is filtering at a minimum IP core prefixes as shown in the example below. route-policy BGP_FILTER_OUTBOUND if destination in CORE_PREFIX then drop else pass endif end-policy Step 3: Review the prefix set referenced in the route policy above to determine if it includes the IP core prefix as shown in the example below. prefix-set CORE_PREFIX 10.1.1.0/24 le 32 end-set If the router is not configured to reject outbound route advertisements for prefixes belonging to the IP core, this is a finding.

Fix Text (F-18011r288721_fix)

Step 1: Configure a prefix set containing the IP core prefix as shown below. RP/0/0/CPU0:R2(config)#prefix-set Step 2: Configure a prefix set containing the current Bogon prefixes as shown below. RP/0/0/CPU0:R2(config)#prefix-set CORE_PREFIX RP/0/0/CPU0:R2(config-pfx)#10.1.1.0/24 le 32 RP/0/0/CPU0:R2(config-pfx)#end-set Step 3: Configure the route policy to drop route advertisements for IP core prefixes as shown in the example below. RP/0/0/CPU0:R2(config)#route-policy BGP_FILTER_OUTBOUND RP/0/0/CPU0:R2(config-rpl)#if destination in CORE_PREFIX then RP/0/0/CPU0:R2(config-rpl-if)#drop RP/0/0/CPU0:R2(config-rpl-if)#else RP/0/0/CPU0:R2(config-rpl-else)#pass RP/0/0/CPU0:R2(config-rpl-else)#endif RP/0/0/CPU0:R2(config-rpl)#end-policy Step 4: Apply the route policy to each external BGP neighbor as shown in the example. RP/0/0/CPU0:R2(config)#router bgp xx RP/0/0/CPU0:R2(config-bgp)#neighbor x.1.23.3 RP/0/0/CPU0:R2(config-bgp-nbr)#address-family ipv4 unicast RP/0/0/CPU0:R2(config-bgp-nbr-af)#route-policy BGP_FILTER_OUTBOUND out RP/0/0/CPU0:R2(config-bgp)#neighbor x.1.24.4 RP/0/0/CPU0:R2(config-bgp-nbr)#address-family ipv4 unicast RP/0/0/CPU0:R2(config-bgp-nbr-af)#route-policy BGP_FILTER_ OUTBOUND out