The /etc/ftpaccess.ctl file must be owned by root.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

SV-38751r1_rule The /etc/ftpaccess.ctl file must be owned by root.

Vulnerability discussion

If the ftpaccess.ctl file is not owned by root, an unauthorized user may modify the file to allow unauthorized access to change the file. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized access to system information.

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Fix text

Change the owner of the ftpaccess.ctl file to root. # chown root /etc/ftpaccess.ctl

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