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Guide to the Secure Configuration of Oracle Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • DNS Server

    Most organizations have an operational need to run at least one nameserver. However, there are many common attacks involving DNS server software, and this server software should be disabled on any ...
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  • Disable DNS Server

    DNS software should be disabled on any systems which does not need to be a nameserver. Note that the BIND DNS server software is not installed on Oracle Linux 9 by default. The remainder of this se...
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  • Application Whitelisting Daemon

    Fapolicyd (File Access Policy Daemon) implements application whitelisting to decide file access rights. Applications that are known via a reputation source are allowed access while unknown applicat...
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  • Install fapolicyd Package

    The fapolicyd package can be installed with the following command: 
    $ sudo yum install fapolicyd
    Rule Medium Severity
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  • Enable the File Access Policy Service

    The File Access Policy service should be enabled. The fapolicyd service can be enabled with the following command: 
    $ sudo systemctl enable fapolicyd.service
    Rule Medium Severity
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  • Configure Fapolicy Module to Employ a Deny-all, Permit-by-exception Policy to Allow the Execution of Authorized Software Programs.

    The Fapolicy module must be configured to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs and to prevent unauthorized software from running.
    Rule Medium Severity
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  • fapolicyd Must be Configured to Limit Access to Users Home Folders

    fapolicyd needs be configured so that users cannot give access to their home folders to other users.
    Rule Medium Severity
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  • Disable vsftpd if Possible

    To minimize attack surface, disable vsftpd if at all possible.
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  • Uninstall vsftpd Package

    The vsftpd package can be removed with the following command: 
     $ sudo yum erase vsftpd
    Rule High Severity
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  • Configure vsftpd to Provide FTP Service if Necessary

    The primary vsftpd configuration file is /etc/vsftpd.conf, if that file exists, or /etc/vsftpd/vsftpd.conf if it does not.
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