Cron and crontab directories must not have extended ACLs.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22387	GEN003110 M6	SV-38112r1_rule	ECLP-1	Medium

Description
To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. ACLs on cron and crontab directories may provide unauthorized access to these directories. Unauthorized modifications to these directories or their contents may result in the addition of unauthorized cron jobs or deny service to authorized cron jobs.

STIG	Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide Draft	2013-01-10

Details

Check Text ( C-37645r1_chk )
Open a terminal session and enter the following commands to view the extended ACLs of the crontab directory. ls -ld /usr/sbin/cron ls -ld /usr/lib/cron ls -ld /usr/bin/crontab ls -ld /private/var/at/cron.deny If the permissions include a '+', the directory has an extended ACL, this is a finding.

Fix Text (F-32886r1_fix)
Open a terminal session and enter the following command to remove the extended ACLs. chmod -N