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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.
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