The Juniper perimeter router must not be configured to redistribute static routes to an alternate gateway service provider into BGP or an IGP peering with the NIPRNet or to other autonomous systems.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253991	JUEX-RT-000190	SV-253991r844006_rule		Low

Description
If the static routes to the alternate gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway Protocol to a NIPRNet gateway, this could make traffic on NIPRNet flow to that particular router and not to the Internet Access Point routers. This could not only wreak havoc with traffic flows on NIPRNet, but it could overwhelm the connection from the router to the NIPRNet gateway(s) and also cause traffic destined for outside of NIPRNet to bypass the defenses of the Internet Access Points.

Description

If the static routes to the alternate gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway Protocol to a NIPRNet gateway, this could make traffic on NIPRNet flow to that particular router and not to the Internet Access Point routers. This could not only wreak havoc with traffic flows on NIPRNet, but it could overwhelm the connection from the router to the NIPRNet gateway(s) and also cause traffic destined for outside of NIPRNet to bypass the defenses of the Internet Access Points.

STIG	Date
Juniper EX Series Switches Router Security Technical Implementation Guide	2023-03-23

Details

Check Text ( C-57443r844004_chk )
This requirement is not applicable for the DODIN Backbone. Review the configuration of the router connecting to the alternate gateway and verify that redistribution of static routes to the alternate gateway is not occurring. Juniper routers use export policies to limit redistribution of routes. Verify a policy exists to filter route redistribution. [edit policy-options] policy-statement { term 1 { from protocol static; then reject; } } Verify the export policy is applied to the EGP and/or IGP protocol. [edit protocols] bgp { export ; group { type external; export ; neighbor { export ; } } ospf { export ; } ospf3 { export ; } } Note: BGP supports export statements at the protocol level (global), the group level, and the neighbor level. Only the most specific policy is applied. If the static routes to the alternate gateway are being redistributed into BGP or any IGP peering with a NIPRNet gateway or another autonomous system, this is a finding.

Check Text ( C-57443r844004_chk )

This requirement is not applicable for the DODIN Backbone.

Review the configuration of the router connecting to the alternate gateway and verify that redistribution of static routes to the alternate gateway is not occurring. Juniper routers use export policies to limit redistribution of routes. Verify a policy exists to filter route redistribution.

[edit policy-options]
policy-statement {
term 1 {
from protocol static;
then reject;
}
}

Verify the export policy is applied to the EGP and/or IGP protocol.
[edit protocols]
bgp {
export ;
group {
type external;
export ;
neighbor

{
export ;
}
}
ospf {
export ;
}
ospf3 {
export ;
}
}

Note: BGP supports export statements at the protocol level (global), the group level, and the neighbor level. Only the most specific policy is applied.

If the static routes to the alternate gateway are being redistributed into BGP or any IGP peering with a NIPRNet gateway or another autonomous system, this is a finding.

Fix Text (F-57394r844005_fix)
This requirement is not applicable for the DODIN Backbone. Configure the router so that static routes are not redistributed to an alternate gateway into either an Exterior Gateway Protocol or Interior Gateway Protocol to the NIPRNet or to other autonomous systems. set policy-options policy-statement term 1 from protocol static set policy-options policy-statement term 1 then reject set protocols bgp group export set protocols bgp group neighbor export set protocols bgp export set protocols ospf export set protocols ospf3 export

Fix Text (F-57394r844005_fix)

This requirement is not applicable for the DODIN Backbone.

Configure the router so that static routes are not redistributed to an alternate gateway into either an Exterior Gateway Protocol or Interior Gateway Protocol to the NIPRNet or to other autonomous systems.
set policy-options policy-statement term 1 from protocol static
set policy-options policy-statement term 1 then reject

set protocols bgp group export
set protocols bgp group neighbor

export
set protocols bgp export

set protocols ospf export
set protocols ospf3 export