The Juniper router must be configured to authenticate NTP sources using authentication that is cryptographically based.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91167	JUNI-ND-001140	SV-101267r1_rule		Medium

Description
If Network Time Protocol is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.

STIG	Date
Juniper Router NDM Security Technical Implementation Guide	2018-11-14

Details

Check Text ( C-90321r2_chk )
Review the router configuration to verify that it is compliant with this requirement as shown in the configuration example below. system { … … … } ntp { authentication-key 1 type md5 value "$8$LMK7NbHkPTQnVwF/"; ## SECRET-DATA authentication-key 2 type md5 value "$8$I3KceWbwgJUH"; ## SECRET-DATA server x.x.x.x key 1 prefer; ## SECRET-DATA server x.x.x.x key 2; ## SECRET-DATA trusted-key [1 2]; } If the router is not configured to authenticate NTP sources using authentication that is cryptographically based, this is a finding.

Check Text ( C-90321r2_chk )

Review the router configuration to verify that it is compliant with this requirement as shown in the configuration example below.

system {
…
…
…
}
ntp {
authentication-key 1 type md5 value "$8$LMK7NbHkPTQnVwF/"; ## SECRET-DATA
authentication-key 2 type md5 value "$8$I3KceWbwgJUH"; ## SECRET-DATA
server x.x.x.x key 1 prefer; ## SECRET-DATA
server x.x.x.x key 2; ## SECRET-DATA
trusted-key [1 2];
}

If the router is not configured to authenticate NTP sources using authentication that is cryptographically based, this is a finding.

Fix Text (F-97365r2_fix)
Configure the router to authenticate NTP sources using authentication that is cryptographically based as shown in the example below. [edit system ntp] set authentication-key 1 type md5 value xxxxxxxxx set authentication-key 2 type md5 value xxxxxxxxx set server x.x.x.x key 1 prefer set server x.x.x.x key 2 set trusted-key [1 2] Note: SHA1 and SHA2-256 are supported with release 18.2.