STIGQter: STIG Summary: Juniper Router RTR Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 12 Feb 2021:

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

DISA Rule

SV-217057r639663_rule

Vulnerability Number

V-217057

Group Title

SRG-NET-000205-RTR-000006

Rule Version

JUNI-RT-000520

Severity

CAT II

CCI(s)

• CCI-001097 - The information system monitors and controls communications at the external boundary of the information system and at key internal boundaries within the system.

Weight

10

Fix Recommendation

Configure the router to filter outbound route advertisements belonging to the IP core.

Configure a prefix list containing prefixes belonging to the IP core.

[edit policy-options]
set prefix-list CORE_PREFIX x.x.x.x/16

Configure a policy-statement to filter BGP route advertisements that will exclude core prefixes.

[edit policy-options]
set policy-statement BGP_ADVERTISE_POLICY term EXCLUDE_CORE from prefix-list CORE_PREFIX
set policy-statement BGP_ADVERTISE_POLICY term EXCLUDE_CORE then reject
set policy-statement BGP_ADVERTISE_POLICY term INCLUDE_OTHER then accept

Configure an export statement referencing the advertise policy on all external BGP peer groups as shown in the example below.

[edit protocols bgp group GROUP_AS4]
set export BGP_ADVERTISE_POLICY

Check Contents

Review the router configuration to verify that there is a filter defined to block route advertisements for prefixes that belong to the IP core.

Verify a prefix list has been configured containing prefixes belonging to the local autonomous system as shown in the example below.

policy-options {
…
…
…
prefix-list CORE_PREFIX {
x.x.x.x/16;
}

Verify that a policy has been configured to not advertise prefixes belong to the core as shown in the example below.

policy-options {
…
…
…
policy-statement BGP_ADVERTISE_POLICY {
term EXCLUDE_CORE {
from {
prefix-list CORE_PREFIX;
}
then reject;
}
term INCLUDE_OTHER {
then accept;
}
}

Verify that the export statement as shown below references the advertise policy.

protocols {
bgp {
group AS4 {
type external;
export BGP_ADVERTISE_POLICY;
peer-as 4;
neighbor x.x.x.x;
}

If the router is not configured to reject outbound route advertisements that belong to the IP core, this is a finding.

Vulnerability Number

V-217057

Documentable

False

Rule Version

JUNI-RT-000520

Severity Override Guidance

Review the router configuration to verify that there is a filter defined to block route advertisements for prefixes that belong to the IP core.

Verify a prefix list has been configured containing prefixes belonging to the local autonomous system as shown in the example below.

policy-options {
…
…
…
prefix-list CORE_PREFIX {
x.x.x.x/16;
}

Verify that a policy has been configured to not advertise prefixes belong to the core as shown in the example below.

policy-options {
…
…
…
policy-statement BGP_ADVERTISE_POLICY {
term EXCLUDE_CORE {
from {
prefix-list CORE_PREFIX;
}
then reject;
}
term INCLUDE_OTHER {
then accept;
}
}

Verify that the export statement as shown below references the advertise policy.

protocols {
bgp {
group AS4 {
type external;
export BGP_ADVERTISE_POLICY;
peer-as 4;
neighbor x.x.x.x;
}

If the router is not configured to reject outbound route advertisements that belong to the IP core, this is a finding.

Check Content Reference

M

Target Key

4032

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