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Guide to the Secure Configuration of Red Hat Enterprise Linux 8

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Account Inactivity Timeout (seconds)

    In an interactive shell, the value is interpreted as the number of seconds to wait for input after issuing the primary prompt. Bash terminates after waiting for that number of seconds if input does...
    Value
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  • Interactive users initialization files

    'A regular expression describing a list of file names for files that are sourced at login time for interactive users'
    Value
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  • Ensure the Logon Failure Delay is Set Correctly in login.defs

    To ensure the logon failure delay controlled by <code>/etc/login.defs</code> is set properly, add or correct the <code>FAIL_DELAY</code> setting in <code>/etc/login.defs</code> to read as follows: ...
    Rule Medium Severity
    Show

  • Configure Polyinstantiation of /tmp Directories

    To configure polyinstantiated /tmp directories, first create the parent directories which will hold the polyinstantiation child directories. Use the following command: <pre>$ sudo mkdir --mode 000 ...
    Rule Low Severity
    Show

  • Configure Polyinstantiation of /var/tmp Directories

    To configure polyinstantiated /tmp directories, first create the parent directories which will hold the polyinstantiation child directories. Use the following command: <pre>$ sudo mkdir --mode 000 ...
    Rule Low Severity
    Show

  • User Initialization Files Must Be Group-Owned By The Primary Group

    Change the group owner of interactive users files to the group found in <pre>/etc/passwd</pre> for the user. To change the group owner of a local interactive user home directory, use the following ...
    Rule Medium Severity
    Show

  • User Initialization Files Must Not Run World-Writable Programs

    Set the mode on files being executed by the user initialization files with the following command: 
    $ sudo chmod o-w FILE
    Rule Medium Severity
    Show

  • User Initialization Files Must Be Owned By the Primary User

    Set the owner of the user initialization files for interactive users to the primary owner with the following command: <pre>$ sudo chown <i>USER</i> /home/<i>USER</i>/.*</pre> This rule ensures eve...
    Rule Medium Severity
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  • Ensure All User Initialization Files Have Mode 0740 Or Less Permissive

    Set the mode of the user initialization files to 0740 with the following command: 
    $ sudo chmod 0740 /home/USER/.INIT_FILE
    Rule Medium Severity
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  • Ensure that Users Path Contains Only Local Directories

    Ensure that all interactive user initialization files executable search path statements do not contain statements that will reference a working directory other than the users home directory.
    Rule Medium Severity
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  • All Interactive Users Must Have A Home Directory Defined

    Assign home directories to all interactive users that currently do not have a home directory assigned. This rule checks if the home directory is properly defined in a folder which has at least one...
    Rule Medium Severity
    Show

  • All User Files and Directories In The Home Directory Must Be Group-Owned By The Primary Group

    Change the group of a local interactive users files and directories to a group that the interactive user is a member of. To change the group owner of a local interactive users files and directories...
    Rule Medium Severity
    Show

  • All User Files and Directories In The Home Directory Must Have a Valid Owner

    Either remove all files and directories from the system that do not have a valid user, or assign a valid user to all unowned files and directories. To assign a valid owner to a local interactive us...
    Rule Medium Severity
    Show

  • All User Files and Directories In The Home Directory Must Have Mode 0750 Or Less Permissive

    Set the mode on files and directories in the local interactive user home directory with the following command: <pre>$ sudo chmod 0750 /home/<i>USER</i>/<i>FILE_DIR</i> </pre> Files that beg...
    Rule Medium Severity
    Show

  • Ensure users' .netrc Files are not group or world accessible

    While the system administrator can establish secure permissions for users' .netrc files, the users can easily override these. This rule ensures every .netrc file or directory under the home direct...
    Rule Medium Severity
    Show

  • All Interactive User Home Directories Must Be Owned By The Primary User

    Change the owner of interactive users home directories to that correct owner. To change the owner of a interactive users home directory, use the following command: <pre>$ sudo chown <i>USER</i> /ho...
    Rule Medium Severity
    Show

  • Ensure that No Dangerous Directories Exist in Root's Path

    The active path of the root account can be obtained by starting a new root shell and running: <pre># echo $PATH</pre> This will produce a colon-separated list of directories in the path. <br> ...
    Group
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  • Ensure that Root's Path Does Not Include World or Group-Writable Directories

    For each element in root's path, run: 
    # ls -ld DIR
    and ensure that write permissions are disabled for group and other.
    Rule Medium Severity
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  • Ensure that Root's Path Does Not Include Relative Paths or Null Directories

    Ensure that none of the directories in root's path is equal to a single <code>.</code> character, or that it contains any instances that lead to relative path traversal, such as <code>..</code> or ...
    Rule Unknown Severity
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  • Ensure that Users Have Sensible Umask Values

    The umask setting controls the default permissions for the creation of new files. With a default <code>umask</code> setting of 077, files and directories created by users will not be readable by an...
    Group
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  • Sensible umask

    Enter default user umask
    Value
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  • Ensure the Default Bash Umask is Set Correctly

    To ensure the default umask for users of the Bash shell is set properly, add or correct the <code>umask</code> setting in <code>/etc/bashrc</code> to read as follows: <pre>umask <xccdf-1.2:sub idre...
    Rule Medium Severity
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  • Ensure the Default C Shell Umask is Set Correctly

    To ensure the default umask for users of the C shell is set properly, add or correct the <code>umask</code> setting in <code>/etc/csh.cshrc</code> to read as follows: <pre>umask <xccdf-1.2:sub idre...
    Rule Medium Severity
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  • Ensure the Default Umask is Set Correctly in login.defs

    To ensure the default umask controlled by <code>/etc/login.defs</code> is set properly, add or correct the <code>UMASK</code> setting in <code>/etc/login.defs</code> to read as follows: <pre>UMASK ...
    Rule Medium Severity
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  • Ensure the Default Umask is Set Correctly For Interactive Users

    Remove the UMASK environment variable from all interactive users initialization files.
    Rule Medium Severity
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  • System Accounting with auditd

    The audit service provides substantial capabilities for recording system activities. By default, the service audits about SELinux AVC denials and certain types of security-relevant events such as s...
    Group
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  • Install audispd-plugins Package

    The audispd-plugins package can be installed with the following command: 
    $ sudo yum install audispd-plugins
    Rule Medium Severity
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  • cron_system_cronjob_use_shares SELinux Boolean

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

  • cron_userdomain_transition SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
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  • cups_execmem SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
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  • cvs_read_shadow SELinux Boolean

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

  • Auditd priority for flushing data to disk

    The setting for flush in /etc/audit/auditd.conf
    Value
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  • daemons_dump_core SELinux Boolean

    default - Default SELinux boolean setting.
    on - SELinux boolean is enabled.
    off - SELinux boolean is disabled.
    Value
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  • deny_execmem SELinux Boolean

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

  • System Accounting with auditd

    The <code>auditd</code> program can perform comprehensive monitoring of system activity. This section makes use of recommended configuration settings for specific policies or use cases. The rules i...
    Group
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  • Appropriate Action Must be Setup When the Internal Audit Event Queue is Full

    The audit system should have an action setup in the event the internal event queue becomes full. To setup an overflow action edit <code>/etc/audit/auditd.conf</code>. Set <code>overflow_action</cod...
    Rule Medium Severity
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  • Verify /boot/grub2/grub.cfg User Ownership

    The file <code>/boot/grub2/grub.cfg</code> should be owned by the <code>root</code> user to prevent destruction or modification of the file. To properly set the owner of <code>/boot/grub2/grub.cfg...
    Rule Medium Severity
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  • GRUB2 bootloader configuration

    During the boot process, the boot loader is responsible for starting the execution of the kernel and passing options to it. The boot loader allows for the selection of different kernels - possibly ...
    Group
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  • L1TF vulnerability mitigation

    Defines the L1TF vulneratility mitigations to employ.
    Value
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  • MDS vulnerability mitigation

    Defines the MDS vulneratility mitigation to employ.
    Value
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  • Confidence level on Hardware Random Number Generator

    Defines the level of trust on the hardware random number generators available in the system and the percentage of entropy to credit.
    Value
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  • Spec Store Bypass Mitigation

    This controls how the Speculative Store Bypass (SSB) vulnerability is mitigated.
    Value
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  • Configure kernel to trust the CPU random number generator

    There exist two ways how to ensure that the Linux kernel trusts the CPU hardware random number generator. If the option is configured during kernel compilation, e.g. the option <code>CONFIG_RANDOM_...
    Rule Medium Severity
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  • Configure audit according to OSPP requirements

    Configure audit to meet requirements for Operating System Protection Profile (OSPP) v4.2.1. Audit defines groups of rules in <code>/usr/share/doc/audit/rules</code> to satisfy specific policies. ...
    Rule Medium Severity
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  • Force kernel panic on uncorrected MCEs

    A Machine Check Exception is an error generated by the CPU itdetects an error in itself, memory or I/O devices. These errors may be corrected and generate a check log entry, if an error cannot be c...
    Rule Medium Severity
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  • Ensure SMAP is not disabled during boot

    The SMAP is used to prevent the supervisor mode from unintentionally reading/writing into memory pages in the user space, it is enabled by default since Linux kernel 3.7. But it could be disabled t...
    Rule Medium Severity
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  • Enable Kernel Page-Table Isolation (KPTI)

    To enable Kernel page-table isolation, add the argument <code>pti=on</code> to the default GRUB 2 command line for the Linux operating system. To ensure that <code>pti=on</code> is added as a kerne...
    Rule Low Severity
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  • Configure the confidence in TPM for entropy

    The TPM security chip that is available in most modern systems has a hardware RNG. It is also used to feed the entropy pool, but generally not credited entropy. Use <code>rng_core.default_quality<...
    Rule Low Severity
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  • Verify /boot/grub2/user.cfg User Ownership

    The file <code>/boot/grub2/user.cfg</code> should be owned by the <code>root</code> user to prevent reading or modification of the file. To properly set the owner of <code>/boot/grub2/user.cfg</co...
    Rule Medium Severity
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  • 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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