Check: JUNI-RT-000530
Juniper Router RTR STIG:
JUNI-RT-000530
(in versions v2 r4 through v1 r2)
Title
The Juniper 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. (Cat III impact)
Discussion
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.
Check Content
Review the router configuration to verify the router is configured to deny updates received from eBGP peers that do not list their AS number as the first AS in the AS_PATH attribute. Verify that the enforce-first-as command has been configured at the BGP or group hierarchy as shown in the example below: protocols { … … … bgp { enforce-first-as; If the router is not configured to reject updates from peers that do not list their AS number as the first AS in the AS_PATH attribute, this is a finding.
Fix Text
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 using the enforce-first-as command as shown in the example below: [edit protocols bgp group] set enforce-first-as
Additional Identifiers
Rule ID: SV-217058r604135_rule
Vulnerability ID: V-217058
Group Title: SRG-NET-000018-RTR-000006
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000032 |
The information system enforces information flow control using organization-defined security policy filters as a basis for flow control decisions for organization-defined information flows. |
Controls
| Number | Title |
|---|---|
| AC-4 (8) |
Security Policy Filters |