STIGQter: STIG Summary: Juniper EX Series Switches Router Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 24 Jul 2024:

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

DISA Rule

SV-254055r844198_rule

Vulnerability Number

V-254055

Group Title

SRG-NET-000364-RTR-000202

Rule Version

JUEX-RT-000830

Severity

CAT II

CCI(s)

• CCI-002403 - Only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.

Weight

10

Fix Recommendation

Configure the router to drop IPv6 packets containing a Hop-by-Hop header with option type values of 0x04 (Tunnel Encapsulation Limit), 0xC9 (Home Address Destination), or 0xC3 (NSAP Address).

set firewall family inet6 filter <name> term 1 from next-header hop-by-hop
set firewall family inet6 filter <name> term 1 from next-header dstopts
set firewall family inet6 filter <name> term 1 then log
set firewall family inet6 filter <name> term 1 then syslog
set firewall family inet6 filter <name> term 1 then discard
<additional terms>
set firewall family inet6 filter <name> term default then log
set firewall family inet6 filter <name> term default then syslog
set firewall family inet6 filter <name> term default then discard

set interfaces <interface name> unit <number> family inet6 filter input <filter name>
set interfaces <interface name> unit <number> family inet6 address <IPv6 address>.<prefix>

Check Contents

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if filters are bound to the applicable interfaces to drop IPv6 packets containing a Hop-by-Hop header with option type values of 0x04 (Tunnel Encapsulation Limit), 0xC9 (Home Address Destination), or 0xC3 (NSAP Address).

[edit firewall family inet6]
filter <name> {
term 1 {
from {
next-header [ hop-by-hop dstopts ];
}
then {
log;
syslog;
discard;
}
}
<additional terms>
term default {
then {
log;
syslog;
discard;
}
}
}

Note: Juniper routers do not support configuring option types for Hop-by-Hop or Destination Options extension headers. Therefore, all packets with the Hop-by-Hop or Destination Options extension header are dropped.

Verify the filter is applied to applicable interfaces.
[edit interfaces]
<interface name> {
unit <number> {
family inet6 {
filter {
input <filter name>;
}
address <IPv6 address>.<prefix>;
}
}
}
Note: Some Juniper devices support both monolithic filters and filter lists. Filter lists separate each term, or set of terms, into a separate filter that is applied sequentially to an interface. If using filter lists, the keywords "input" or "output" change to "input-list" or "output-list". Verify the final list item is a deny-all filter. The deny-all filter is created once per family and can be reused across multiple lists. For example:

input-list [ permit_mgt permit_routing_protocols default-deny ];

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

Vulnerability Number

V-254055

Documentable

False

Rule Version

JUEX-RT-000830

Severity Override Guidance

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to determine if filters are bound to the applicable interfaces to drop IPv6 packets containing a Hop-by-Hop header with option type values of 0x04 (Tunnel Encapsulation Limit), 0xC9 (Home Address Destination), or 0xC3 (NSAP Address).

[edit firewall family inet6]
filter <name> {
term 1 {
from {
next-header [ hop-by-hop dstopts ];
}
then {
log;
syslog;
discard;
}
}
<additional terms>
term default {
then {
log;
syslog;
discard;
}
}
}

Note: Juniper routers do not support configuring option types for Hop-by-Hop or Destination Options extension headers. Therefore, all packets with the Hop-by-Hop or Destination Options extension header are dropped.

Verify the filter is applied to applicable interfaces.
[edit interfaces]
<interface name> {
unit <number> {
family inet6 {
filter {
input <filter name>;
}
address <IPv6 address>.<prefix>;
}
}
}
Note: Some Juniper devices support both monolithic filters and filter lists. Filter lists separate each term, or set of terms, into a separate filter that is applied sequentially to an interface. If using filter lists, the keywords "input" or "output" change to "input-list" or "output-list". Verify the final list item is a deny-all filter. The deny-all filter is created once per family and can be reused across multiple lists. For example:

input-list [ permit_mgt permit_routing_protocols default-deny ];

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

Check Content Reference

M

Target Key

5479