The Juniper EX switch must be configured to synchronize internal information system clocks using redundant authoritative time sources.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-253920	JUEX-NM-000430	SV-253920r997748_rule		Medium

Description
The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DOD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: A time server designated for the appropriate DOD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.

Description

The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DOD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: A time server designated for the appropriate DOD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source.

STIG	Date
Juniper EX Series Switches Network Device Management Security Technical Implementation Guide	2024-06-20

Details

Check Text ( C-57372r997747_chk )
Determine if the network device is configured to synchronize internal information system clocks with the primary and secondary time sources. Verify the Network Time Protocol (NTP) configuration. [edit system ntp] authentication-key 1 type sha256 value "PSK"; ## SECRET-DATA authentication-key 2 type sha1 value "PSK"; ## SECRET-DATA server key 1 prefer; ## SECRET-DATA server key 2; ## SECRET-DATA trusted-key [ 1 2 ]; source-address ; If the network device is not configured to synchronize internal information system clocks with the primary and secondary time sources, this is a finding.

Check Text ( C-57372r997747_chk )

Determine if the network device is configured to synchronize internal information system clocks with the primary and secondary time sources.

Verify the Network Time Protocol (NTP) configuration.
[edit system ntp]
authentication-key 1 type sha256 value "PSK"; ## SECRET-DATA
authentication-key 2 type sha1 value "PSK"; ## SECRET-DATA
server

key 1 prefer; ## SECRET-DATA
server

key 2; ## SECRET-DATA
trusted-key [ 1 2 ];
source-address ;

If the network device is not configured to synchronize internal information system clocks with the primary and secondary time sources, this is a finding.

Fix Text (F-57323r843792_fix)
Configure the network device to synchronize internal information system clocks with the primary and secondary time sources. set system ntp authentication-key 1 type sha256 set system ntp authentication-key 1 value "PSK" set system ntp authentication-key 2 type sha1 set system ntp authentication-key 2 value "PSK" set system ntp server key 1 set system ntp server prefer set system ntp server key 2 set system ntp trusted-key 1 set system ntp trusted-key 2 set system ntp source-address

Fix Text (F-57323r843792_fix)

Configure the network device to synchronize internal information system clocks with the primary and secondary time sources.

set system ntp authentication-key 1 type sha256
set system ntp authentication-key 1 value "PSK"
set system ntp authentication-key 2 type sha1
set system ntp authentication-key 2 value "PSK"
set system ntp server

key 1
set system ntp server

prefer
set system ntp server

key 2
set system ntp trusted-key 1
set system ntp trusted-key 2
set system ntp source-address