The ftpusers file must exist.

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Associated with IA controls: ECCD-2, ECCD-1

Associated with: CCI-000225

SV-51983r1_rule The ftpusers file must exist.

Vulnerability discussion

The ftpusers file contains a list of accounts not allowed to use FTP to transfer files. If this file does not exist, then unauthorized accounts can utilize FTP.

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Create an ftpusers file appropriate for the running FTP service. For gssftp: Create an /etc/ftpusers file containing a list of accounts not authorized for FTP. For vsftp: Create an /etc/vsftpd.ftpusers or /etc/vsftpd/ftpusers (as appropriate) file containing a list of accounts not authorized for FTP.

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