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Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide (STIG) V1R12

Rules and Groups employed by this XCCDF Profile

  • Enable Execute Disable (XD) or No Execute (NX) Support on x86 Systems

    Recent processors in the x86 family support the ability to prevent code execution on a per memory page basis. Generically and on AMD processors, this ability is called No Execute (NX), while on Int...
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  • Enable NX or XD Support in the BIOS

    Reboot the system and enter the BIOS or Setup configuration menu. Navigate the BIOS configuration menu and make sure that the option is enabled. The setting may be located under a Security section....
    Rule Medium Severity
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  • Services

    The best protection against vulnerable software is running less software. This section describes how to review the software which Ubuntu 20.04 installs on a system and disable software which is not...
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  • APT service configuration

    The apt service manage the package management and update of the whole system. Its configuration need to be properly defined to ensure efficient security updates, packages and repository authenticat...
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  • Disable unauthenticated repositories in APT configuration

    Unauthenticated repositories should not be used for updates.
    Rule Unknown Severity
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  • Base Services

    This section addresses the base services that are installed on a Ubuntu 20.04 default installation which are not covered in other sections. Some of these services listen on the network and should b...
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  • Disable KDump Kernel Crash Analyzer (kdump)

    The <code>kdump-tools</code> service provides a kernel crash dump analyzer. It uses the <code>kexec</code> system call to boot a secondary kernel ("capture" kernel) following a system crash, which ...
    Rule Medium Severity
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  • Deprecated services

    Some deprecated software services impact the overall system security due to their behavior (leak of confidentiality in network exchange, usage as uncontrolled communication channel, risk associated...
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  • Uninstall the telnet server

    The telnet daemon should be uninstalled.
    Rule High Severity
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  • Network Time Protocol

    The Network Time Protocol is used to manage the system clock over a network. Computer clocks are not very accurate, so time will drift unpredictably on unmanaged systems. Central time protocols can...
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  • The Chrony package is installed

    System time should be synchronized between all systems in an environment. This is typically done by establishing an authoritative time server or set of servers and having all systems synchronize th...
    Rule Medium Severity
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  • Configure Time Service Maxpoll Interval

    The <code>maxpoll</code> should be configured to <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_time_service_set_maxpoll" use="legacy"></xccdf-1.2:sub> in <code>/etc/ntp.conf</code> o...
    Rule Medium Severity
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  • Synchronize internal information system clocks

    Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.
    Rule Medium Severity
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  • Obsolete Services

    This section discusses a number of network-visible services which have historically caused problems for system security, and for which disabling or severely limiting the service has been the best a...
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  • Rlogin, Rsh, and Rexec

    The Berkeley r-commands are legacy services which allow cleartext remote access and have an insecure trust model.
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  • Uninstall rsh-server Package

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

    The SSH protocol is recommended for remote login and remote file transfer. SSH provides confidentiality and integrity for data exchanged between two systems, as well as server authentication, throu...
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  • Install the OpenSSH Server Package

    The openssh-server package should be installed. The openssh-server package can be installed with the following command: 
    $ apt-get install openssh-server
    Rule Medium Severity
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  • Enable the OpenSSH Service

    The SSH server service, sshd, is commonly needed. The sshd service can be enabled with the following command: 
    $ sudo systemctl enable sshd.service
    Rule Medium Severity
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  • Configure OpenSSH Server if Necessary

    If the system needs to act as an SSH server, then certain changes should be made to the OpenSSH daemon configuration file <code>/etc/ssh/sshd_config</code>. The following recommendations can be app...
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