The Palo Alto Networks security platform must authenticate Network Time Protocol sources.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-62785	PANW-NM-000145	SV-77275r1_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 affected scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.

STIG	Date
Palo Alto Networks NDM Security Technical Implementation Guide	2019-12-20

Details

Check Text ( C-63593r1_chk )
Go to Device >> Setup >> Services In the "Services" window, the Primary NTP Server Authentication Type and Secondary NTP Server Authentication Type must be either Symmetric Key or Autokey. If the "Primary NTP Server Authentication Type" and "Secondary NTP Server Authentication Type" fields are "none", this is a finding.

Fix Text (F-68705r1_fix)
Go to Device >> Setup >> Services Select the "Edit" icon (the gear symbol in the upper-right corner of the pane). In the "Services" window, in the NTP tab, in the "Primary NTP Server Address" field and the "Secondary NTP Server Address" field, enter the IP address or hostname of the NTP servers. In the "Authentication Type" field, select one of the following: Symmetric Key; this option uses symmetric key exchange, which are shared secrets. Enter the key ID, algorithm, authentication key, and confirm the authentication key; for the algorithm, select "SHA1". Autokey; this option uses auto key, or public key cryptography. Commit changes by selecting "Commit" in the upper-right corner of the screen. Select "OK" when the confirmation dialog appears.

Fix Text (F-68705r1_fix)

Go to Device >> Setup >> Services
Select the "Edit" icon (the gear symbol in the upper-right corner of the pane).
In the "Services" window, in the NTP tab, in the "Primary NTP Server Address" field and the "Secondary NTP Server Address" field, enter the IP address or hostname of the NTP servers.

In the "Authentication Type" field, select one of the following:
Symmetric Key; this option uses symmetric key exchange, which are shared secrets. Enter the key ID, algorithm, authentication key, and confirm the authentication key; for the algorithm, select "SHA1".
Autokey; this option uses auto key, or public key cryptography.
Commit changes by selecting "Commit" in the upper-right corner of the screen.
Select "OK" when the confirmation dialog appears.