Directory traversal vulnerability in enkrypt.php in Sascha Schroeder krypt (aka Holtstraeter Rot 13) allows remote attackers to read arbitrary files via a .. (dot dot) in the datei parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33027
http://www.securityfocus.com/bid/22997
http://www.securityfocus.com/archive/1/463011/100/0/threaded