V-22387

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

Check the permissions of the crontab directories.

Procedure:
# ls -ld /var/spool/cron /var/spool/cron/tabs
ls -ld /etc/crontab /etc/cron.{d,daily,hourly,monthly,weekly}
or 
# ls -ld /etc/cron*|grep -v deny

If the permissions include a '+' the directory has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding