Total Commander 6.53 uses weak encryption to store FTP usernames and passwords in WCX_FTP.INI, which allows local users to decrypt the passwords and gain access to FTP servers, as possibly demonstrated by the W32.Gudeb worm.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23497
http://www.vupen.com/english/advisories/2005/2780
http://www.networksecurity.fi/advisories/total-commander.html