The Juniper router must be configured to log all packets that have been dropped.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253998	JUEX-RT-000260	SV-253998r844027_rule		Low

Description
Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done or attempted to be done, and by whom, to compile an accurate risk assessment. Auditing the actions on network devices provides a means to recreate an attack or identify a configuration mistake on the device.

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

Details

Check Text ( C-57450r844025_chk )
Review the router interface firewall filters to verify all deny statements are logged. At a minimum, all discarding filter terms must have the "syslog" action enabled. Verify all discarding firewall filter terms are configured with (minimally) the "syslog" action: [edit firewall] family inet { filter { term { from { ; } then { log; syslog; <<< Must be enabled for local and external syslog. discard; } } } } family inet6 { filter { term { from { ; } then { log; syslog; <<< Must be enabled for local and external syslog. discard; } } } } If packets being dropped are not logged, this is a finding.

Check Text ( C-57450r844025_chk )

Review the router interface firewall filters to verify all deny statements are logged. At a minimum, all discarding filter terms must have the "syslog" action enabled.

Verify all discarding firewall filter terms are configured with (minimally) the "syslog" action:
[edit firewall]
family inet {
filter {
term {
from {
;
}
then {
log;
syslog; <<< Must be enabled for local and external syslog.
discard;
}
}
}
}
family inet6 {
filter {
term {
from {
;
}
then {
log;
syslog; <<< Must be enabled for local and external syslog.
discard;
}
}
}
}

If packets being dropped are not logged, this is a finding.

Fix Text (F-57401r844026_fix)
Configure interface firewall filters to log all deny statements. All discarding firewall filter terms: set firewall family inet filter term then log set firewall family inet filter term then syslog <<< Minimally must be configured for all discarding filter terms. set firewall family inet filter term then discard set firewall family inet6 filter term then log set firewall family inet6 filter term then syslog <<< Minimally must be configured for all discarding filter terms. set firewall family inet6 filter term then discard

Fix Text (F-57401r844026_fix)

Configure interface firewall filters to log all deny statements.

All discarding firewall filter terms:

set firewall family inet filter term then log
set firewall family inet filter term then syslog <<< Minimally must be configured for all discarding filter terms.
set firewall family inet filter term then discard

set firewall family inet6 filter term then log
set firewall family inet6 filter term then syslog <<< Minimally must be configured for all discarding filter terms.
set firewall family inet6 filter term then discard