The time synchronization configuration file (such as /etc/ntp.conf) must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22297	GEN000253	SV-37418r1_rule	ECLP-1	Medium

Description
A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. If an illicit time source is used for synchronization, the integrity of system logs and the security of the system could be compromised. If the configuration files controlling time synchronization are not protected, unauthorized modifications could result in the failure of time synchronization.

Description

A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. If an illicit time source is used for synchronization, the integrity of system logs and the security of the system could be compromised. If the configuration files controlling time synchronization are not protected, unauthorized modifications could result in the failure of time synchronization.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2015-06-12

Details

Check Text ( C-36101r1_chk )
Check the NTP configuration file has no extended ACL. # ls -l /etc/ntp.conf If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text (F-23451r1_fix)
Remove the extended ACL from the NTP configuration file. # setfacl --remove-all /etc/ntp.conf