Cron and crontab directories must not have extended ACLs.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-38112r1_rule Cron and crontab directories must not have extended ACLs.

Vulnerability discussion

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.

Check content

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

Open a terminal session and enter the following command to remove the extended ACLs. chmod -N

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