I've always wondered what could realistically (and maybe theoretically) happen if one of those "always trying to log in with common passwords" remote addresses guessed my password and gained admin access to my FTP server at home.
From what I understand, an FTP server only has access to whatever directories and files that are already shared, but it can't execute arbitrary code and you can't add more directories or files to gain access to the rest of the system (at least I couldn't find how it could be done). So the "bad guys" could only slightly expand their remote storage space or hope that I execute a virus that they put on my hard drives and only then could things get really bad.
What could a malicious person do if they gained full access to my remote FTP server?