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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Configure server restrictions for ntpd

    ntpd is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of systems and use ...
    Rule Medium Severity
    Show

  • Configure ntpd To Run As ntp User

    ntp is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of systems and use a...
    Rule Medium Severity
    Show

  • Obsolete Services

    This section discusses a number of network-visible services which have historically caused problems for system security, and for which disabling or...
    Group
    Show

  • Uninstall rsync Package

    The rsyncd service can be used to synchronize files between systems over network links. The <code>rsync</code> package can be removed with the foll...
    Rule Medium Severity
    Show

  • Xinetd

    The <code>xinetd</code> service acts as a dedicated listener for some network services (mostly, obsolete ones) and can be used to provide access co...
    Group
    Show

  • Uninstall xinetd Package

    The xinetd package can be removed with the following command: 
    $ apt-get remove xinetd
    Rule Low Severity
    Show

  • NIS

    The Network Information Service (NIS), also known as 'Yellow Pages' (YP), and its successor NIS+ have been made obsolete by Kerberos, LDAP, and oth...
    Group
    Show

  • Rlogin, Rsh, and Rexec

    The Berkeley r-commands are legacy services which allow cleartext remote access and have an insecure trust model.
    Group
    Show

  • Uninstall rsh-server Package

    The rsh-server package can be removed with the following command: 
    $ apt-get remove rsh-server
    Rule High Severity
    Show

  • Network Routing

    A router is a very desirable target for a potential adversary because they fulfill a variety of infrastructure networking roles such as access to ...
    Group
    Show

  • Remove Rsh Trust Files

    The files <code>/etc/hosts.equiv</code> and <code>~/.rhosts</code> (in each user's home directory) list remote hosts and users that are trusted by ...
    Rule High Severity
    Show

  • Chat/Messaging Services

    The talk software makes it possible for users to send and receive messages across systems through a terminal session.
    Group
    Show

  • Uninstall talk Package

    The <code>talk</code> package contains the client program for the Internet talk protocol, which allows the user to chat with other users on differe...
    Rule Medium Severity
    Show

  • Telnet

    The telnet protocol does not provide confidentiality or integrity for information transmitted on the network. This includes authentication informat...
    Group
    Show

  • Remove telnet Clients

    The telnet client allows users to start connections to other systems via the telnet protocol.
    Rule Low Severity
    Show

  • TFTP Server

    TFTP is a lightweight version of the FTP protocol which has traditionally been used to configure networking equipment. However, TFTP provides littl...
    Group
    Show

  • TFTP server secure directory

    Specify the directory which is used by TFTP server as a root directory when running in secure mode.
    Value
    Show

  • Print Support

    The Common Unix Printing System (CUPS) service provides both local and network printing support. A system running the CUPS service can accept print...
    Group
    Show

  • Uninstall CUPS Package

    The cups package can be removed with the following command: 
    $ apt-get remove cups
    Rule Unknown Severity
    Show

  • Disable the CUPS Service

    The cups service can be disabled with the following command: 
    $ sudo systemctl mask --now cups.service
    Rule Unknown Severity
    Show

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