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Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000080-GPOS-00048

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  • Ubuntu operating systems booted with United Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule High Severity
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  • SRG-OS-000254-GPOS-00095

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  • The Ubuntu operating system must initiate session audits at system startup.

    &lt;VulnDiscussion&gt;If auditing is enabled late in the startup process, the actions of some startup processes may not be audited. Some audit syst...
    Rule Medium Severity
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  • SRG-OS-000185-GPOS-00079

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  • Ubuntu operating systems handling data requiring data at rest protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.

    &lt;VulnDiscussion&gt;Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and...
    Rule Medium Severity
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  • SRG-OS-000478-GPOS-00223

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  • The Ubuntu operating system must implement NIST FIPS-validated cryptography to protect classified information and for the following: to provision digital signatures, to generate cryptographic hashes, and to protect unclassified information requiring confidentiality and cryptographic protection in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating ...
    Rule High Severity
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  • SRG-OS-000343-GPOS-00134

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  • The Ubuntu operating system must immediately notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity.

    &lt;VulnDiscussion&gt;If security personnel are not notified immediately when storage volume reaches 75% utilization, they are unable to plan for a...
    Rule Low Severity
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  • SRG-OS-000479-GPOS-00224

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  • The Ubuntu operating system audit event multiplexor must be configured to off-load audit logs onto a different system in real time, if the system is interconnected.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common...
    Rule Low Severity
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  • SRG-OS-000479-GPOS-00224

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  • The Ubuntu operating system must have a crontab script running weekly to off-load audit events of standalone systems.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common...
    Rule Low Severity
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  • SRG-OS-000366-GPOS-00153

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  • Advance package Tool (APT) must be configured to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.

    &lt;VulnDiscussion&gt;Changes to any software components can have significant effects on the overall security of the Ubuntu operating system. This ...
    Rule Medium Severity
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  • SRG-OS-000437-GPOS-00194

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  • The Ubuntu operating system must be configured so that Advance package Tool (APT) removes all software components after updated versions have been installed.

    &lt;VulnDiscussion&gt;Previous versions of software components that are not removed from the information system after updates have been installed m...
    Rule Medium Severity
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  • SRG-OS-000095-GPOS-00049

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  • The Ubuntu operating system must not have the Network Information Service (NIS) package installed.

    &lt;VulnDiscussion&gt;Removing the Network Information Service (NIS) package decreases the risk of the accidental (or intentional) activation of NI...
    Rule High Severity
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  • SRG-OS-000095-GPOS-00049

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  • The Ubuntu operating system must not have the rsh-server package installed.

    &lt;VulnDiscussion&gt;It is detrimental for Ubuntu operating systems to provide, or install by default, functionality exceeding requirements or mis...
    Rule High Severity
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  • SRG-OS-000191-GPOS-00080

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  • The Ubuntu operating system must deploy Endpoint Security for Linux Threat Prevention (ENSLTP).

    &lt;VulnDiscussion&gt;Without the use of automated mechanisms to scan for security flaws on a continuous and/or periodic basis, the operating syste...
    Rule Medium Severity
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  • SRG-OS-000269-GPOS-00103

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  • The Ubuntu operating system must be configured to preserve log records from failure events.

    &lt;VulnDiscussion&gt;Failure to a known state can address safety or security in accordance with the mission/business needs of the organization. Fa...
    Rule Medium Severity
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  • SRG-OS-000297-GPOS-00115

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  • The Ubuntu operating system must have an application firewall installed in order to control remote access methods.

    &lt;VulnDiscussion&gt;Remote access services, such as those providing remote access to network devices and information systems, which lack automate...
    Rule Medium Severity
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  • SRG-OS-000342-GPOS-00133

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  • The Ubuntu operating system audit event multiplexor must be configured to off-load audit logs onto a different system or storage media from the system being audited.

    &lt;VulnDiscussion&gt;Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common...
    Rule Low Severity
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  • SRG-OS-000383-GPOS-00166

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  • The Ubuntu operating system must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.

    &lt;VulnDiscussion&gt;If cached authentication information is out-of-date, the validity of the authentication information may be questionable.&lt;/...
    Rule Low Severity
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  • SRG-OS-000480-GPOS-00226

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  • The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt.

    &lt;VulnDiscussion&gt;Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain acc...
    Rule Low Severity
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  • SRG-OS-000480-GPOS-00227

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  • The Ubuntu operating system must display the date and time of the last successful account logon upon logon.

    &lt;VulnDiscussion&gt;Configuring the Ubuntu operating system to implement organization-wide security implementation guides and security checklists...
    Rule Low Severity
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  • SRG-OS-000021-GPOS-00005

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  • The Ubuntu operating system must be configured so that three consecutive invalid logon attempts by a user automatically locks the account until released by an administrator.

    &lt;VulnDiscussion&gt;By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise...
    Rule Medium Severity
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  • SRG-OS-000024-GPOS-00007

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  • The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local access to the system via a graphical user logon.

    &lt;VulnDiscussion&gt;The banner must be acknowledged by the user prior to allowing the user access to the operating system. This provides assuranc...
    Rule Medium Severity
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  • SRG-OS-000109-GPOS-00056

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  • The Ubuntu operating system must prevent direct login into the root account.

    &lt;VulnDiscussion&gt;To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and...
    Rule Medium Severity
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  • SRG-OS-000134-GPOS-00068

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  • The Ubuntu operating system must be configured so that only users who need access to security functions are part of the sudo group.

    &lt;VulnDiscussion&gt;An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform...
    Rule High Severity
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  • SRG-OS-000228-GPOS-00088

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  • The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting any publically accessible connection to the system.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy...
    Rule Medium Severity
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  • SRG-OS-000069-GPOS-00037

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  • The Ubuntu operating system must enforce password complexity by requiring that at least one upper-case character be used.

    &lt;VulnDiscussion&gt;Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...
    Rule Low Severity
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  • SRG-OS-000070-GPOS-00038

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  • The Ubuntu operating system must enforce password complexity by requiring that at least one lower-case character be used.

    &lt;VulnDiscussion&gt;Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, ...
    Rule Low Severity
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