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Guide to the Secure Configuration of Red Hat Enterprise Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • kernel.kptr_restrict

    Configure exposition of kernel pointer addresses
    Value
  • Enable ExecShield via sysctl

    By default on Red Hat Enterprise Linux 9 64-bit systems, ExecShield is enabled and can only be disabled if the hardware does not support ExecShield...
    Rule Medium Severity
  • Restrict Exposed Kernel Pointer Addresses Access

    To set the runtime status of the <code>kernel.kptr_restrict</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.kptr_r...
    Rule Medium Severity
  • Enable Randomized Layout of Virtual Address Space

    To set the runtime status of the <code>kernel.randomize_va_space</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.r...
    Rule Medium Severity
  • 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, th...
    Group
  • Enable page allocator poisoning

    To enable poisoning of free pages, add the argument <code>page_poison=1</code> to the default GRUB 2 command line for the Linux operating system. T...
    Rule Medium Severity
  • Enable SLUB/SLAB allocator poisoning

    To enable poisoning of SLUB/SLAB objects, add the argument <code>slub_debug=<xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_slub_debug...
    Rule Medium Severity
  • SELinux

    SELinux is a feature of the Linux kernel which can be used to guard against misconfigured or compromised programs. SELinux enforces the idea that p...
    Group
  • SELinux policy

    Type of policy in use. Possible values are: <br>targeted - Only targeted network daemons are protected. <br>strict - Full SELinux protection. <br>m...
    Value
  • SELinux state

    enforcing - SELinux security policy is enforced. <br>permissive - SELinux prints warnings instead of enforcing. <br>disabled - SELinux is fully dis...
    Value
  • Install libselinux Package

    The libselinux package can be installed with the following command:
    $ sudo dnf install libselinux
    Rule High Severity
  • Install policycoreutils-python-utils package

    The <code>policycoreutils-python-utils</code> package can be installed with the following command: <pre> $ sudo dnf install policycoreutils-python-...
    Rule Medium Severity
  • Install policycoreutils Package

    The policycoreutils package can be installed with the following command:
    $ sudo dnf install policycoreutils
    Rule Low Severity
  • Uninstall mcstrans Package

    The <code>mcstransd</code> daemon provides category label information to client processes requesting information. The label translations are define...
    Rule Low Severity
  • domain_fd_use SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
  • Uninstall setroubleshoot-plugins Package

    The SETroubleshoot plugins are used to analyze SELinux AVC data. The service provides information around configuration errors, unauthorized intrusi...
    Rule Low Severity
  • Uninstall setroubleshoot-server Package

    The SETroubleshoot service notifies desktop users of SELinux denials. The service provides information around configuration errors, unauthorized in...
    Rule Low Severity
  • Uninstall setroubleshoot Package

    The SETroubleshoot service notifies desktop users of SELinux denials. The service provides information around configuration errors, unauthorized in...
    Rule Low Severity
  • Ensure SELinux Not Disabled in the kernel arguments

    SELinux can be disabled at boot time by disabling it via a kernel argument. Remove any instances of <code>selinux=0</code> from the kernel argument...
    Rule Medium Severity
  • Ensure SELinux Not Disabled in /etc/default/grub

    SELinux can be disabled at boot time by an argument in <code>/etc/default/grub</code>. Remove any instances of <code>selinux=0</code> from the kern...
    Rule Medium Severity

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