privatepw program in wu-ftpd before 2.6.1-6 allows local users to overwrite arbitrary files via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5915
http://www.securityfocus.com/bid/2189
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-001.php3