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

The Juniper PE router must be configured to ignore or block all packets with any IP options.

DISA Rule

SV-254024r997532_rule

Vulnerability Number

V-254024

Group Title

SRG-NET-000205-RTR-000016

Rule Version

JUEX-RT-000520

Severity

CAT II

CCI(s)

• CCI-002403 - Only allow incoming communications from organization-defined authorized sources routed to organization-defined authorized destinations.
• CCI-004866 - Employ organization-defined controls by type of denial-of-service to achieve the denial-of-service objective.

Weight

10

Fix Recommendation

Configure the router to drop all packets with IP options.

set firewall family inet filter <filter name> term 1 from ip-options any
set firewall family inet filter <filter name> term 1 then log
set firewall family inet filter <filter name> term 1 then syslog
set firewall family inet filter <filter name> term 1 then discard
<additional accept terms>
set firewall family inet filter default term 1 then log
set firewall family inet filter default term 1 then syslog
set firewall family inet filter default term 1 then discard

set interfaces <interface name> unit <number> family inet filter input <filter name>
set interfaces <interface name> unit <number> family inet address <IPv4 address>/<mask>

Check Contents

Review the router configuration to determine if it will block all packets with IP options.

[edit firewall family inet]
filter <name> {
term 1 {
from {
ip-options any;
}
then {
log;
syslog;
discard;
}
}
<additional accept terms>
term default {
then {
log;
syslog;
discard;
}
}
}
[edit interfaces]
<interface name> {
unit <number> {
family inet {
filter input <filter name>;
address <IPv4 address>/<mask>;
}
}
}

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 all packets with IP options, this is a finding.

Vulnerability Number

V-254024

Documentable

False

Rule Version

JUEX-RT-000520

Severity Override Guidance

Review the router configuration to determine if it will block all packets with IP options.

[edit firewall family inet]
filter <name> {
term 1 {
from {
ip-options any;
}
then {
log;
syslog;
discard;
}
}
<additional accept terms>
term default {
then {
log;
syslog;
discard;
}
}
}
[edit interfaces]
<interface name> {
unit <number> {
family inet {
filter input <filter name>;
address <IPv4 address>/<mask>;
}
}
}

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 all packets with IP options, this is a finding.

Check Content Reference

M

Target Key

5479