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V-22297

CAT II (Medium)

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

Rule ID

SV-44788r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000225

Discussion

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.

Check Content

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

Remove the extended ACL from the NTP configuration file.
# setfacl --remove-all /etc/ntp.conf