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Red Hat Enterprise Linux 9 Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000480-GPOS-00227

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  • SRG-OS-000480-GPOS-00227

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  • RHEL 9 vendor packaged system security patches and updates must be installed and up to date.

    Installing software updates is a fundamental mitigation against the exploitation of publicly known vulnerabilities. If the most recent security patches and updates are not installed, unauthorized u...
    Rule Medium Severity
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  • SRG-OS-000023-GPOS-00006

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  • SRG-OS-000480-GPOS-00227

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  • The graphical display manager must not be the default target on RHEL 9 unless approved.

    Unnecessary service packages must not be installed to decrease the attack surface of the system. Graphical display managers have a long history of security vulnerabilities and must not be used, unl...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • RHEL 9 must enable the hardware random number generator entropy gatherer service.

    The most important characteristic of a random number generator is its randomness, namely its ability to deliver random numbers that are impossible to predict. Entropy in computer security is associ...
    Rule Low Severity
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  • SRG-OS-000269-GPOS-00103

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  • RHEL 9 systemd-journald service must be enabled.

    In the event of a system failure, RHEL 9 must preserve any information necessary to determine cause of failure and any information necessary to return to operations with least disruption to system ...
    Rule Medium Severity
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  • SRG-OS-000324-GPOS-00125

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  • The systemd Ctrl-Alt-Delete burst key sequence in RHEL 9 must be disabled.

    A locally logged-on user who presses Ctrl-Alt-Delete when at the console can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the r...
    Rule High Severity
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  • SRG-OS-000324-GPOS-00125

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  • SRG-OS-000324-GPOS-00125

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  • RHEL 9 debug-shell systemd service must be disabled.

    The debug-shell requires no authentication and provides root privileges to anyone who has physical access to the machine. While this feature is disabled by default, masking it adds an additional la...
    Rule Medium Severity
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  • SRG-OS-000080-GPOS-00048

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  • SRG-OS-000480-GPOS-00227

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  • RHEL 9 must disable the ability of systemd to spawn an interactive boot process.

    Using interactive or recovery boot, the console user could disable auditing, firewalls, or other services, weakening system security.
    Rule Medium Severity
    Show

  • SRG-OS-000080-GPOS-00048

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  • RHEL 9 must require a unique superusers name upon booting into single-user and maintenance modes.

    Having a nondefault grub superuser username makes password-guessing attacks less effective.
    Rule High Severity
    Show

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