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Guide to the Secure Configuration of Red Hat Enterprise Linux 10

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Prevent applications from mapping low portion of virtual memory

    To set the runtime status of the <code>vm.mmap_min_addr</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w vm.mmap_min_addr=...
    Rule Medium Severity
    Show

  • Disable Core Dumps

    A core dump file is the memory image of an executable program when it was terminated by the operating system due to errant behavior. In most cases,...
    Group
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  • Disable acquiring, saving, and processing core dumps

    The <code>systemd-coredump.socket</code> unit is a socket activation of the <code>systemd-coredump@.service</code> which processes core dumps. By m...
    Rule Medium Severity
    Show

  • Disable core dump backtraces

    The <code>ProcessSizeMax</code> option in <code>[Coredump]</code> section of <code>/etc/systemd/coredump.conf</code> specifies the maximum size in ...
    Rule Medium Severity
    Show

  • Disable storing core dump

    The <code>Storage</code> option in <code>[Coredump]</code> sectionof <code>/etc/systemd/coredump.conf</code> can be set to <code>none</code> to dis...
    Rule Medium Severity
    Show

  • Disable Core Dumps for All Users

    To disable core dumps for all users, add the following line to <code>/etc/security/limits.conf</code>, or to a file within the <code>/etc/security/...
    Rule Medium Severity
    Show

  • Disable Core Dumps for SUID programs

    To set the runtime status of the <code>fs.suid_dumpable</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.suid_dumpable=...
    Rule Medium Severity
    Show

  • Enable ExecShield

    ExecShield describes kernel features that provide protection against exploitation of memory corruption errors such as buffer overflows. These featu...
    Group
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  • Uninstall setroubleshoot Package

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

  • Enable ExecShield via sysctl

    By default on Red Hat Enterprise Linux 10 64-bit systems, ExecShield is enabled and can only be disabled if the hardware does not support ExecShiel...
    Rule Medium Severity
    Show

  • 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
    Show

  • 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
    Show

  • 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
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  • Enable NX or XD Support in the BIOS

    Reboot the system and enter the BIOS or Setup configuration menu. Navigate the BIOS configuration menu and make sure that the option is enabled. Th...
    Rule Medium Severity
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  • Memory Poisoning

    Memory Poisoning consists of writing a special value to uninitialized or freed memory. Poisoning can be used as a mechanism to prevent leak of info...
    Group
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  • slub_debug - debug options

    Defines the debug options to use in slub_debug kernel command line argument.
    Value
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  • 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
    Show

  • 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
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  • 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
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  • 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
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  • SELinux state

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

    The libselinux package can be installed with the following command: 
    $ sudo dnf install libselinux
    Rule High Severity
    Show

  • 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
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  • Install policycoreutils Package

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

  • 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
    Show

  • Ensure No Device Files are Unlabeled by SELinux

    Device files, which are used for communication with important system resources, should be labeled with proper SELinux types. If any device files ca...
    Rule Medium Severity
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  • Ensure No Daemons are Unconfined by SELinux

    Daemons for which the SELinux policy does not contain rules will inherit the context of the parent process. Because daemons are launched during sta...
    Rule Medium Severity
    Show

  • Ensure SELinux is Not Disabled

    The SELinux state should be set to <code>enforcing</code> or <code>permissive</code> at system boot time. In the file <code>/etc/selinux/config</co...
    Rule High Severity
    Show

  • Configure SELinux Policy

    The SELinux <code>targeted</code> policy is appropriate for general-purpose desktops and servers, as well as systems in many other roles. To config...
    Rule Medium Severity
    Show

  • Ensure SELinux State is Enforcing

    The SELinux state should be set to <code><xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_selinux_state" use="legacy"></xccdf-1.2:sub><...
    Rule High Severity
    Show

  • SELinux - Booleans

    Enable or Disable runtime customization of SELinux system policies without having to reload or recompile the SELinux policy.
    Group
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  • auditadm_exec_content SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • authlogin_nsswitch_use_ldap SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • authlogin_radius SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • deny_execmem SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • kerberos_enabled SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • polyinstantiation_enabled SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • secure_mode_insmod SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • selinuxuser_execheap SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • selinuxuser_execmod SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • selinuxuser_execstack SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • ssh_sysadm_login SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
    Show

  • Disable the ssh_sysadm_login SELinux Boolean

    By default, the SELinux boolean <code>ssh_sysadm_login</code> is disabled. If this setting is enabled, it should be disabled. To disable the <code...
    Rule Medium Severity
    Show

  • Services

    The best protection against vulnerable software is running less software. This section describes how to review the software which Red Hat Enterpris...
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  • Avahi Server

    The Avahi daemon implements the DNS Service Discovery and Multicast DNS protocols, which provide service and host discovery on a network. It allows...
    Group
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  • Disable Avahi Server if Possible

    Because the Avahi daemon service keeps an open network port, it is subject to network attacks. Disabling it can reduce the system's vulnerability t...
    Group
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  • Disable Avahi Server Software

    The avahi-daemon service can be disabled with the following command: 
    $ sudo systemctl mask --now avahi-daemon.service
    Rule Medium Severity
    Show

  • Base Services

    This section addresses the base services that are installed on a Red Hat Enterprise Linux 10 default installation which are not covered in other se...
    Group
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