GEN004400 - Files executed through a mail aliases file must be owned by root.

Information

Files executed through a mail aliases file must be owned by root and must reside within a directory owned and writable only by root.

Solution

Edit the /etc/mail/aliases file (alternatively, /usr/lib/sendmail.cf). Locate the entries executing a program. They will appear similar to the following line.
Aliasname: : /usr/local/bin/ls (or some other program name)
Ensure root owns the programs and the directory(ies) they reside in by using the chown command to change owner to root.
Procedure:
# chown root filename

See Also

http://iasecontent.disa.mil/stigs/zip/U_STIG_Library_2015_07.zip