Detections
Analytics

1.55 CISC-RT-000540

Information

The Cisco 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.

GROUP ID: V-216782RULE ID: SV-216782r945854

Verifying the path a route has traversed will ensure the IP core is not used as a transit network for unauthorized or possibly even Internet traffic. All autonomous system boundary routers (ASBRs) must ensure updates received from eBGP peers list their AS number as the first AS in the AS_PATH attribute.

Solution

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

RP/0/0/CPU0:R2(config)#router bgp 2RP/0/0/CPU0:R2(config-bgp)#no bgp enforce-first-as disable

See Also

https://workbench.cisecurity.org/benchmarks/23599

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4(8), CAT|III, CCI|CCI-000032, Rule-ID|SV-216782r945854_rule, STIG-ID|CISC-RT-000540, Vuln-ID|V-216782

Plugin: Cisco

Control ID: 55476179a65e28d2cf6dab61b7823b39daa50b479e760f94f2b058b872849e97