convert-fcrontab in Fcron 2.9.5 and 3.0.0 allows remote attackers to create or overwrite arbitrary files via ".." sequences and a symlink attack on the temporary file that is used during conversion.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24504
http://www.vupen.com/english/advisories/2006/0435
http://www.trustix.org/errata/2006/0006
http://www.securityfocus.com/bid/25693