Check: JUNI-RT-000240
Juniper Router RTR STIG:
JUNI-RT-000240
(in versions v3 r1 through v1 r0.1)
Title
The Juniper perimeter router must be configured to deny network traffic by default and allow network traffic by exception. (Cat I impact)
Discussion
A deny-all, permit-by-exception network communications traffic policy ensures that only connections that are essential and approved are allowed. This requirement applies to both inbound and outbound network communications traffic. All inbound and outbound traffic must be denied by default. Firewalls and perimeter routers should only allow traffic through that is explicitly permitted. The initial defense for the internal network is to block any traffic at the perimeter that is attempting to make a connection to a host residing on the internal network. In addition, allowing unknown or undesirable outbound traffic by the firewall or router will establish a state that will permit the return of this undesirable traffic inbound.
Check Content
This requirement is not applicable for the DoDIN Backbone. Review the router configuration to verify that the inbound filter applied to all external interfaces is configured to allow specific ports and protocols and deny all other traffic. Verify that an inbound filter is applied to all external interfaces as shown in the example below. interfaces { ge-0/0/0 { unit 0 { family inet { filter { input FILTER_INBOUND_TRAFFIC; } address 11.1.12.2/24; } } } Review inbound filters to verify that the ending term is configured to deny all other traffic that is not explicitly allowed. firewall { family inet { filter FILTER_INBOUND_TRAFFIC { term ALLOW_BGP { from { destination-address { 11.1.24.0/24; } protocol tcp; destination-port bgp; } then accept; } … … … term ALLOW_XYZ { from { protocol xyz; } then accept; } term DENY_ALL_OTHER { then { syslog; discard; } } } If the filter is not configured to allow specific ports and protocols and deny all other traffic, this is a finding. If the filter is not configured inbound on all external interfaces, this is a finding.
Fix Text
This requirement is not applicable for the DoDIN Backbone. Configure a term at the end of the inbound filter to deny all other traffic by default as shown in the example below. [edit firewall family inet] set filter FILTER_INBOUND_TRAFFIC term DENY_ALL_OTHER then syslog discard
Additional Identifiers
Rule ID: SV-217029r604135_rule
Vulnerability ID: V-217029
Group Title: SRG-NET-000202-RTR-000001
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001109 |
Deny network communications traffic by default and allow network communications traffic by exception at managed interfaces; and/or for organization-defined systems. |
Controls
Number | Title |
---|---|
SC-7(5) |
Deny by Default / Allow by Exception |