V-22386

Discussion

To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. ACLs on crontab files may provide unauthorized access to the files.

Check Content

Check the permissions of the crontab files.
Procedure:

# ls -lL /var/spool/cron /var/spool/cron/tabs

ls –lL /etc/crontab /etc/cron.{d,daily,hourly,monthly,weekly}

or 
# ls -lL /etc/cron*|grep -v deny

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.