The ftpusers file must be group-owned by root, bin, sys, or system.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-63015r1_rule The ftpusers file must be group-owned by root, bin, sys, or system.

Vulnerability discussion

If the ftpusers file is not group-owned by root or a system group, an unauthorized user may modify the file to allow unauthorized accounts to use FTP.

Check content

Check the group ownership of the ftpusers file. Procedure: # ls -lL /etc/ftpusers /etc/vsftpd.ftpusers /etc/vsftpd/ftpusers If the file is not group-owned by root, bin, sys, or system, this is a finding.

Fix text

Change the group owner of the ftpusers file. Procedure: # chgrp root /etc/ftpusers /etc/vsftpd.ftpusers /etc/vsftpd/ftpusers

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