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

The Juniper perimeter router must be configured to drop IPv6 packets containing a Destination Option header with invalid option type values.

DISA Rule

SV-233296r639663_rule

Vulnerability Number

V-233296

Group Title

SRG-NET-000364-RTR-000203

Rule Version

JUNI-RT-000384

Severity

CAT II

CCI(s)

• CCI-002403 - The information system only allows incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Weight

10

Fix Recommendation

Step 1: Configure a filter to block packets with a Destination Option header as shown in the example.

user@R1# edit firewall family inet6
user@R1# edit filter IPV6-INGRESS-FILTER
user@R1# set term DEST_ OPT_HEADER from next-header dstops
user@R1# set term DEST_ OPT_HEADER then discard syslog
user@R1# top

Step 2: Apply the filter inbound on all external IPv6-enabled interfaces.

user@R1# edit interfaces ge-0/0/0 unit 0 family inet6
user@R1# set filter input IPV6-INGRESS-FILTER
user@R1# commit

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration and determine if filters are bound to the external interfaces to drop all IPv6 packets containing a Destination Option header with option type values of 0x05 (Router Alert) or 0xC2 (Jumbo Payload).

The following example will block any inbound IPv6 packet containing a Destination Option header with option type values of with option type values of 0x05 (Router Alert) or 0xC2 (Jumbo Payload):
Step 1: Verify that all external IPv6-enabled interfaces have an IPv6 filter as shown in the example below.

interfaces {
ge-0/0/0 {
unit 0 {
family inet6 {
filter {
input IPV6-INGRESS-FILTER;
}
address 2001:1:0:146::1/64;
}
}
}
}

Step 2: Verify that the IPV6 filter blocks all packets with a Destination Option header as shown in the example below.

firewall {
family inet6 {
filter IPV6-INGRESS-FILTER {
term DEST_ OPT_HEADER {
from {
next-header dstops;
}
then {
syslog;
discard;
}
}
term ALLOW_TCP_ESTABLISHED {
from {
next-header tcp;
tcp-established;
}
then accept;
}
term DENY_BY_DEFAULT {
then {
syslog;
discard;
}
}
}
}
}


Note: Currently JUNOS has no method to filter option type within Destination Option header. Hence, all packets with the Destination Option header must be dropped.

If the router is not configured to drop IPv6 packets containing a Destination Option header with invalid option type values, this is a finding.

Vulnerability Number

V-233296

Documentable

False

Rule Version

JUNI-RT-000384

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration and determine if filters are bound to the external interfaces to drop all IPv6 packets containing a Destination Option header with option type values of 0x05 (Router Alert) or 0xC2 (Jumbo Payload).

The following example will block any inbound IPv6 packet containing a Destination Option header with option type values of with option type values of 0x05 (Router Alert) or 0xC2 (Jumbo Payload):
Step 1: Verify that all external IPv6-enabled interfaces have an IPv6 filter as shown in the example below.

interfaces {
ge-0/0/0 {
unit 0 {
family inet6 {
filter {
input IPV6-INGRESS-FILTER;
}
address 2001:1:0:146::1/64;
}
}
}
}

Step 2: Verify that the IPV6 filter blocks all packets with a Destination Option header as shown in the example below.

firewall {
family inet6 {
filter IPV6-INGRESS-FILTER {
term DEST_ OPT_HEADER {
from {
next-header dstops;
}
then {
syslog;
discard;
}
}
term ALLOW_TCP_ESTABLISHED {
from {
next-header tcp;
tcp-established;
}
then accept;
}
term DENY_BY_DEFAULT {
then {
syslog;
discard;
}
}
}
}
}


Note: Currently JUNOS has no method to filter option type within Destination Option header. Hence, all packets with the Destination Option header must be dropped.

If the router is not configured to drop IPv6 packets containing a Destination Option header with invalid option type values, this is a finding.

Check Content Reference

M

Target Key

4032

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