I came across some Linux administrator documents where there are some specifications mentioned for anonymous ftp settings...it says

For ftpd daemon options the settings should be such that "If any directories will be made writable, the -u 027 option must be used. Note: this is a wu-ftpd specific requirement"

I know about the /etc/inetd.conf which specifies
"service-name socket-type protocol wait/nowait user:group server-program arguments"

AND for ftp it would be like
ftp stream tcp nowait root /usr/libexec/ftpd ftpd -ll

I am not able to understand the which directories it is mentioned about..
Could anyone please explain...or send any document link ...

Thank you for your help...