If you get these in your syslog:
Dec 19 05:07:01 ip-10-0-2-194 cron[9036]: (*system*aws-crawnchers) WRONG FILE OWNER (/etc/cron.d/some-cronjob)
Dec 19 05:08:01 ip-10-0-2-194 cron[9036]: (*system*web-server) INSECURE MODE (group/other writable) (/etc/cron.d/some-cronjob)
You need to: