500 OOPS: vsftpd: refusing to run with writable root inside chroot()
é um bug na versão 2.3.5, foi corrigido em 3.0 mas não está disponível em Wheezy. Veja a solução nesta resposta em stackoverflow :
This blog here points out how to fix this problem.
The issue being that the user's root directory is writable. The Frontier Group provides you with a fix on vsFTPd.
Here are the steps to be taken (copy paste from the tutorial, in case the link dies)
login as root (or sudo..) and do the following: apt-get install python-software-properties sudo add-apt-repository ppa:thefrontiergroup/vsftpd sudo apt-get update sudo apt-get install vsftpd vi /etc/vsftpd.conf and add the following allow_writeable_chroot=YES sudo service vsftpd restart