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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • System Settings

    Contains rules that check correct system settings.
    Group
    Show

  • Installing and Maintaining Software

    The following sections contain information on security-relevant choices during the initial operating system installation process and the setup of s...
    Group
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  • Prefer to use a 64-bit Operating System when supported

    Prefer installation of 64-bit operating systems when the CPU supports it.
    Rule Medium Severity
    Show

  • System and Software Integrity

    System and software integrity can be gained by installing antivirus, increasing system encryption strength with FIPS, verifying installed software,...
    Group
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  • Package "prelink" Must not be Installed

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

  • Software Integrity Checking

    Both the AIDE (Advanced Intrusion Detection Environment) software and the RPM package management system provide mechanisms for verifying the integr...
    Group
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  • Integrity Scan Notification Email Address

    Specify the email address for designated personnel if baseline configurations are changed in an unauthorized manner.
    Value
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  • Verify Integrity with RPM

    The RPM package management system includes the ability to verify the integrity of installed packages by comparing the installed files with informat...
    Group
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  • Verify Integrity with AIDE

    AIDE conducts integrity checks by comparing information about files with previously-gathered information. Ideally, the AIDE database is created imm...
    Group
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  • Install AIDE

    The aide package can be installed with the following command: 
    $ apt-get install aide
    Rule Medium Severity
    Show

  • Maximum KeepAlive Requests for HTTPD

    The setting for MaxKeepAliveRequests in httpd.conf
    Value
    Show

  • SNMP read-write community string

    Specify the SNMP community string used for read-write access.
    Value
    Show

  • net.ipv6.conf.all.accept_ra_pinfo

    Accept prefix information in router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_ra_rtr_pref

    Accept router preference in router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_ra

    Accept all router advertisements?
    Value
    Show

  • net.ipv6.conf.all.accept_redirects

    Toggle ICMP Redirect Acceptance
    Value
    Show

  • net.ipv6.conf.default.accept_ra

    Accept default router advertisements by default?
    Value
    Show

  • net.ipv6.conf.default.accept_redirects

    Toggle ICMP Redirect Acceptance By Default
    Value
    Show

  • net.ipv4.conf.default.rp_filter

    Enables source route verification
    Value
    Show

  • SSSD memcache_timeout option

    Value of the memcache_timeout option in the [nss] section of SSSD config /etc/sssd/sssd.conf.
    Value
    Show

  • Build and Test AIDE Database

    Run the following command to generate a new database: <pre>$ sudo aideinit</pre> By default, the database will be written to the file <code>/var...
    Rule Medium Severity
    Show

  • Configure AIDE to Verify the Audit Tools

    The operating system file integrity tool must be configured to protect the integrity of the audit tools.
    Rule Medium Severity
    Show

  • Configure Periodic Execution of AIDE

    At a minimum, AIDE should be configured to run a weekly scan. To implement a daily execution of AIDE at 4:05am using cron, add the following line t...
    Rule Medium Severity
    Show

  • Federal Information Processing Standard (FIPS)

    The Federal Information Processing Standard (FIPS) is a computer security standard which is developed by the U.S. Government and industry working g...
    Group
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  • Verify '/proc/sys/crypto/fips_enabled' exists

    On a system where FIPS 140-2 mode is enabled, <code>/proc/sys/crypto/fips_enabled</code> must exist. To verify FIPS mode, run the following command...
    Rule High Severity
    Show

  • System Cryptographic Policies

    Linux has the capability to centrally configure cryptographic polices. The command <code>update-crypto-policies</code> is used to set the policy ap...
    Group
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  • SSH client RekeyLimit - size

    Specify the size component of the rekey limit. This limit signifies amount of data. After this amount of data is transferred through the connection...
    Value
    Show

  • SSH client RekeyLimit - time

    Specify the time component of the rekey limit. The session key is renegotiated after the defined amount of time passes. The number is followed by u...
    Value
    Show

  • The system-provided crypto policies

    Specify the crypto policy for the system.
    Value
    Show

  • Harden SSH client Crypto Policy

    Crypto Policies are means of enforcing certain cryptographic settings for selected applications including OpenSSH client. To override the system wi...
    Rule Medium Severity
    Show

  • Operating System Vendor Support and Certification

    The assurance of a vendor to provide operating system support and maintenance for their product is an important criterion to ensure product stabili...
    Group
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  • The Installed Operating System Is FIPS 140-2 Certified

    To enable processing of sensitive information the operating system must provide certified cryptographic modules compliant with FIPS 140-2 standard....
    Rule High Severity
    Show

  • Endpoint Protection Software

    Endpoint protection security software that is not provided or supported by Red Hat can be installed to provide complementary or duplicative secur...
    Group
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  • Configure Backups of User Data

    The operating system must conduct backups of user data contained in the operating system. The operating system provides utilities for automating ba...
    Rule Medium Severity
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  • McAfee Endpoint Security Software

    In DoD environments, McAfee Host-based Security System (HBSS) and VirusScan Enterprise for Linux (VSEL) is required to be installed on all systems.
    Group
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  • The age of McAfee defintion file before requiring updating

    Specify the amount of time (in seconds) before McAfee definition files need to be updated.
    Value
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  • McAfee Endpoint Security for Linux (ENSL)

    McAfee Endpoint Security for Linux (ENSL) is a suite of software applications used to monitor, detect, and defend computer networks and systems.
    Group
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  • Install McAfee Endpoint Security for Linux (ENSL)

    Install McAfee Endpoint Security for Linux antivirus software which is provided for DoD systems and uses signatures to search for the presence of v...
    Rule Medium Severity
    Show

  • McAfee Host-Based Intrusion Detection Software (HBSS)

    McAfee Host-based Security System (HBSS) is a suite of software applications used to monitor, detect, and defend computer networks and systems.
    Group
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  • Install the Host Intrusion Prevention System (HIPS) Module

    Install the McAfee Host Intrusion Prevention System (HIPS) Module if it is absolutely necessary. If SELinux is enabled, do not install or enable th...
    Rule Medium Severity
    Show

  • Disk Partitioning

    To ensure separation and protection of data, there are top-level system directories which should be placed on their own physical partition or logic...
    Group
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  • Encrypt Partitions

    Ubuntu 20.04 natively supports partition encryption through the Linux Unified Key Setup-on-disk-format (LUKS) technology. The easiest way to encryp...
    Rule High Severity
    Show

  • Ensure /home Located On Separate Partition

    If user home directories will be stored locally, create a separate partition for <code>/home</code> at installation time (or migrate it later using...
    Rule Low Severity
    Show

  • Ensure /srv Located On Separate Partition

    If a file server (FTP, TFTP...) is hosted locally, create a separate partition for <code>/srv</code> at installation time (or migrate it later usin...
    Rule Unknown Severity
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  • Ensure /tmp Located On Separate Partition

    The <code>/tmp</code> directory is a world-writable directory used for temporary file storage. Ensure it has its own partition or logical volume at...
    Rule Low Severity
    Show

  • Ensure /var Located On Separate Partition

    The <code>/var</code> directory is used by daemons and other system services to store frequently-changing data. Ensure that <code>/var</code> has i...
    Rule Low Severity
    Show

  • Ensure /var/log Located On Separate Partition

    System logs are stored in the <code>/var/log</code> directory. Ensure that <code>/var/log</code> has its own partition or logical volume at instal...
    Rule Low Severity
    Show

  • Ensure /var/log/audit Located On Separate Partition

    Audit logs are stored in the <code>/var/log/audit</code> directory. Ensure that <code>/var/log/audit</code> has its own partition or logical volum...
    Rule Low Severity
    Show

  • Ensure /var/tmp Located On Separate Partition

    The <code>/var/tmp</code> directory is a world-writable directory used for temporary file storage. Ensure it has its own partition or logical volum...
    Rule Medium Severity
    Show

  • Ensure Sudo Logfile Exists - sudo logfile

    A custom log sudo file can be configured with the 'logfile' tag. This rule configures a sudo custom logfile at the default location suggested by CI...
    Rule Low Severity
    Show

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