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Guide to the Secure Configuration of Red Hat Enterprise Linux CoreOS 4

Rules, Groups, and Values defined within the XCCDF Benchmark

  • System Settings

    Contains rules that check correct system settings.
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  • Installing and Maintaining Software

    The following sections contain information on security-relevant choices during the initial operating system installation process and the setup of software updates.
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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
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  • System and Software Integrity

    System and software integrity can be gained by installing antivirus, increasing system encryption strength with FIPS, verifying installed software, enabling SELinux, installing an Intrusion Prevent...
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  • Disable Prelinking

    The prelinking feature changes binaries in an attempt to decrease their startup time. In order to disable it, change or add the following line inside the file <code>/etc/sysconfig/prelink</code>: <...
    Rule Medium Severity
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  • Ensure there are no legacy + NIS entries in /etc/passwd

    The + character in /etc/passwd file marks a place where entries from a network information service (NIS) should be directly inserted.
    Rule Medium Severity
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  • Software Integrity Checking

    Both the AIDE (Advanced Intrusion Detection Environment) software and the RPM package management system provide mechanisms for verifying the integrity of installed software. AIDE uses snapshots of ...
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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 information about the files taken from the package metadat...
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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 immediately after initial system configuration, and t...
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  • Install AIDE

    The aide package can be installed with the following command: 
    $ sudo dnf install aide
    Rule Medium Severity
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  • Build and Test AIDE Database

    Run the following command to generate a new database: <pre>$ sudo /usr/sbin/aide --init</pre> By default, the database will be written to the file <code>/var/lib/aide/aide.db.new.gz</code>. Sto...
    Rule Medium Severity
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  • Configure SSH to use System Crypto Policy

    Crypto Policies provide a centralized control over crypto algorithms usage of many packages. SSH is supported by crypto policy, but the SSH configuration may be set up to ignore it. To check that C...
    Rule Medium Severity
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  • Install the dracut-fips Package

    To enable FIPS, the system requires that the <code>dracut-fips</code> package be installed. The <code>dracut-fips</code> package can be installed with the following command: <pre> $ sudo dnf instal...
    Rule Medium Severity
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  • Enable Dracut FIPS Module

    To enable FIPS mode, run the following command: <pre>fips-mode-setup --enable</pre> To enable FIPS, the system requires that the <code>fips</code> module is added in <code>dracut</code> configurati...
    Rule High Severity
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  • Enable FIPS Mode

    OpenShift has an installation-time flag that can enable FIPS mode for the cluster. The flag <pre>fips: true</pre> must be enabled at install time in the <pre>install-config.yaml</pre> file. If thi...
    Rule High Severity
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  • Ensure '/etc/system-fips' exists

    On a system where FIPS mode is enabled, /etc/system-fips must exist. To enable FIPS mode, run the following command: 
    fips-mode-setup --enable
    Rule High Severity
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  • Set kernel parameter 'crypto.fips_enabled' to 1

    System running in FIPS mode is indicated by kernel parameter <code>'crypto.fips_enabled'</code>. This parameter should be set to <code>1</code> in FIPS mode. To enable FIPS mode, run the following ...
    Rule High Severity
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  • 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.
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  • 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 applicable for the various cryptographic back-ends, ...
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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, the session key is renegotiated. The number is f...
    Value
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