crontab.c in crontab in FreeBSD allows local users to determine the existence of arbitrary directories via a command-line argument composed of a directory name concatenated with a directory traversal sequence that leads to the /etc/crontab pathname.
openwall.com/lists/oss-security/2011/02/28/14
openwall.com/lists/oss-security/2011/02/28/6
securityreason.com/securityalert/8117
www.securityfocus.com/archive/1/516716/100/0/threaded
www.securityfocus.com/bid/46604
exchange.xforce.ibmcloud.com/vulnerabilities/65900
marc.info/?l=full-disclosure&m=129891323028897&w=2