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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

  • Set the UEFI Boot Loader Password

    The grub2 boot loader should have a superuser account and password protection enabled to protect boot-time settings. <br> <br> Since plaintext passwords are a security risk, generate a hash...
    Rule High Severity
    Show

  • zIPL bootloader configuration

    During the boot process, the bootloader is responsible for starting the execution of the kernel and passing options to it. The default Red Hat Enterprise Linux CoreOS 4 boot loader for s390x system...
    Group
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  • Disable merging of slabs with similar size

    The kernel may merge similar slabs together to reduce overhead and increase cache hotness of objects. Disabling merging of slabs keeps the slabs separate and reduces the risk of kernel heap overflo...
    Rule Medium Severity
    Show

  • Configure Speculative Store Bypass Mitigation

    Certain CPUs are vulnerable to an exploit against a common wide industry wide performance optimization known as Speculative Store Bypass (SSB). In such cases, recent stores to the same memory loca...
    Rule Medium Severity
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  • Enforce Spectre v2 mitigation

    Spectre V2 is an indirect branch poisoning attack that can lead to data leakage. An exploit for Spectre V2 tricks the indirect branch predictor into executing code from a future indirect branch cho...
    Rule High Severity
    Show

  • Non-UEFI GRUB2 bootloader configuration

    Non-UEFI GRUB2 bootloader configuration
    Group
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  • UEFI GRUB2 bootloader configuration

    UEFI GRUB2 bootloader configuration
    Group
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  • Remove the kernel mapping in user mode

    This feature reduces the number of hardware side channels by ensuring that the majority of kernel addresses are not mapped into userspace. This configuration is available from kernel 4.15, but may ...
    Rule High Severity
    Show

  • Enable Auditing to Start Prior to the Audit Daemon in zIPL

    To ensure all processes can be audited, even those which start prior to the audit daemon, check that all boot entries in <code>/boot/loader/entries/*.conf</code> have <code>audit=1</code> included ...
    Rule Medium Severity
    Show

  • Extend Audit Backlog Limit for the Audit Daemon in zIPL

    To improve the kernel capacity to queue all log events, even those which start prior to the audit daemon, check that all boot entries in <code>/boot/loader/entries/*.conf</code> have <code>audit_ba...
    Rule Medium Severity
    Show

  • Ensure all zIPL boot entries are BLS compliant

    Ensure that zIPL boot entries fully adheres to Boot Loader Specification (BLS) by checking that /etc/zipl.conf doesn't contain image = .
    Rule Medium Severity
    Show

  • Ensure zIPL bootmap is up to date

    Make sure that <code>/boot/bootmap</code> is up to date.<br> Every time a boot entry or zIPL configuration is changed <code>/boot/bootmap</code> needs to be updated to reflect the changes.<br> Run ...
    Rule Medium Severity
    Show

  • Ensure SELinux Not Disabled in zIPL

    To ensure SELinux is not disabled at boot time, check that no boot entry in /boot/loader/entries/*.conf has selinux=0 included in its options.
    Rule Medium Severity
    Show

  • Enable page allocator poisoning in zIPL

    To enable poisoning of free pages, check that all boot entries in <code>/boot/loader/entries/*.conf</code> have <code>page_poison=1</code> included in its options.<br> To ensure that new kernels an...
    Rule Medium Severity
    Show

  • Enable SLUB/SLAB allocator poisoning in zIPL

    To enable poisoning of SLUB/SLAB objects, check that all boot entries in <code>/boot/loader/entries/*.conf</code> have <code>slub_debug=P</code> included in its options.<br> To ensure that new kern...
    Rule Medium Severity
    Show

  • Disable vsyscalls in zIPL

    To disable use of virtual syscalls, check that all boot entries in <code>/boot/loader/entries/*.conf</code> have <code>vsyscall=none</code> included in its options.<br> To ensure that new kernels a...
    Rule Medium Severity
    Show

  • Protect Random-Number Entropy Pool

    The I/O operations of the Linux kernel block layer due to their inherently unpredictable execution times have been traditionally considered as a reliable source to contribute to random-number entro...
    Group
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  • Kernel Configuration

    Contains rules that check the kernel configuration that was used to build it.
    Group
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  • Hash function for kernel module signing

    The hash function to use when signing modules during kernel build process.
    Value
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  • Key and certificate for kernel module signing

    The private key and certificate to use when signing modules during kernel build process. On systems where the OpenSSL ENGINE_pkcs11 is functional — a PKCS#11 URI as defined by RFC7512 In the latter...
    Value
    Show

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