The NTP server is connected to a network other than the management network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-25883	NET0814	SV-32243r1_rule	ECSC-1	Medium

Description
NTP provides an efficient and scalable method for managed network elements to actively synchronize to an accurate time source. Insuring that there are always NTP servers available to provide time is critical. It is imperative that all single points of failure for the NTP infrastructure are eliminated. Knowing the correct time is not only crucial for proper network functioning but also for security. Compromising an NTP server opens the door to more sophisticated attacks that include NTP poisoning, replay attacks, and denial of service. To provide security through separation and isolation, the NTP server should only be connected to the management network. This enables the NTP server to provide time to the managed devices using a secured as well as a preferred path.

Description

NTP provides an efficient and scalable method for managed network elements to actively synchronize to an accurate time source. Insuring that there are always NTP servers available to provide time is critical. It is imperative that all single points of failure for the NTP infrastructure are eliminated. Knowing the correct time is not only crucial for proper network functioning but also for security. Compromising an NTP server opens the door to more sophisticated attacks that include NTP poisoning, replay attacks, and denial of service. To provide security through separation and isolation, the NTP server should only be connected to the management network. This enables the NTP server to provide time to the managed devices using a secured as well as a preferred path.

STIG	Date
Network Devices Security Technical Implementation Guide	2015-09-22

Details

Check Text ( C-32705r1_chk )
Review the layer 2 and layer 3 network topology to determine what network the NTP server is connected to. Verify that the server has been configured or assigned an IP address that belongs to the management network.

Fix Text (F-28796r1_fix)
Connect the NTP server only to the management network.