BisonFTP V4R1 allows local users to access directories outside of their home directory by uploading .bdl files, which can then be linked to other directories.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6782
http://www.bisonftp.com/ServRev.htm
http://archives.neohapsis.com/archives/bugtraq/2001-07/0025.html