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Guide to the Secure Configuration of Fedora

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Disable acquiring, saving, and processing core dumps

    The systemd-coredump.socket unit is a socket activation of the systemd-coredump@.service which processes core dumps. By masking the unit, core dump processing is disabled.
    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 bytes of a core which will be processed. Core dump...
    Rule Medium Severity
    Show

  • Uninstall mcstrans Package

    The <code>mcstransd</code> daemon provides category label information to client processes requesting information. The label translations are defined in <code>/etc/selinux/targeted/setrans.conf</cod...
    Rule Low Severity
    Show

  • Daemon Umask

    The umask is a per-process setting which limits the default permissions for creation of new files and directories. The system includes initialization scripts which set the default umask for system ...
    Group
    Show

  • daemon umask

    Enter umask for daemons
    Value
    Show

  • Set Daemon Umask

    The file <code>/etc/init.d/functions</code> includes initialization parameters for most or all daemons started at boot time. Many daemons on the system already individually restrict themselves to a...
    Rule Unknown Severity
    Show

  • Enable ExecShield

    ExecShield describes kernel features that provide protection against exploitation of memory corruption errors such as buffer overflows. These features include random placement of the stack and othe...
    Group
    Show

  • kernel.kptr_restrict

    Configure exposition of kernel pointer addresses
    Value
    Show

  • Enable ExecShield via sysctl

    By default on Fedora 64-bit systems, ExecShield is enabled and can only be disabled if the hardware does not support ExecShield or is disabled in /etc/default/grub.
    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_restrict=<xccdf-1.2:sub idref="xccdf_org.ssgproject...
    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.randomize_va_space=2</pre> To make sure that the se...
    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, this ability is called No Execute (NX), while on Int...
    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. The setting may be located under a Security section....
    Rule Medium Severity
    Show

  • Install PAE Kernel on Supported 32-bit x86 Systems

    Systems that are using the 64-bit x86 kernel package do not need to install the kernel-PAE package because the 64-bit x86 kernel already includes this support. However, if the system is 32-bit and ...
    Rule Unknown Severity
    Show

  • 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 information and detection of corrupted memory.
    Group
    Show

  • slub_debug - debug options

    Defines the debug options to use in slub_debug kernel command line argument.
    Value
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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 programs should be limited in what files they can a...
    Group
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  • SELinux policy

    Type of policy in use. Possible values are:
    targeted - Only targeted network daemons are protected.
    strict - Full SELinux protection.
    mls - Multiple levels of security
    Value
    Show

  • SELinux state

    enforcing - SELinux security policy is enforced.
    permissive - SELinux prints warnings instead of enforcing.
    disabled - SELinux is fully disabled.
    Value
    Show

  • Install libselinux Package

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

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