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Guide to the Secure Configuration of Red Hat Enterprise Linux 7

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Ensure Users Cannot Change GNOME3 Screensaver Idle Activation

    If not already configured, ensure that users cannot change GNOME3 screensaver lock settings by adding <pre>/org/gnome/desktop/screensaver/idle-acti...
    Rule Medium Severity
    Show

  • Set GNOME3 Screensaver Inactivity Timeout

    The idle time-out value for inactivity in the GNOME3 desktop is configured via the <code>idle-delay</code> setting must be set under an appropriate...
    Rule Medium Severity
    Show

  • Set GNOME3 Screensaver Lock Delay After Activation Period

    To activate the locking delay of the screensaver in the GNOME3 desktop when the screensaver is activated, add or set <code>lock-delay</code> to <co...
    Rule Medium Severity
    Show

  • Enable GNOME3 Screensaver Lock After Idle Period

    To activate locking of the screensaver in the GNOME3 desktop when it is activated, add or set <code>lock-enabled</code> to <code>true</code> in <c...
    Rule Medium Severity
    Show

  • Uninstall iprutils Package

    The iprutils package can be removed with the following command: 
    $ sudo yum erase iprutils
    Rule Medium Severity
    Show

  • Ensure Only Users Logged In To Real tty Can Execute Sudo - sudo requiretty

    The sudo <code>requiretty</code> tag, when specified, will only execute sudo commands from users logged in to a real tty. This should be enabled by...
    Rule Medium Severity
    Show

  • Disable Full User Name on Splash Shield

    By default when the screen is locked, the splash shield will show the user's full name. This should be disabled to prevent casual observers from se...
    Rule Medium Severity
    Show

  • Ensure Users Cannot Change GNOME3 Screensaver Settings

    If not already configured, ensure that users cannot change GNOME3 screensaver lock settings by adding <code>/org/gnome/desktop/screensaver/lock-del...
    Rule Medium Severity
    Show

  • Ensure Users Cannot Change GNOME3 Session Idle Settings

    If not already configured, ensure that users cannot change GNOME3 session idle settings by adding <code>/org/gnome/desktop/session/idle-delay</code...
    Rule Medium Severity
    Show

  • GNOME System Settings

    GNOME provides configuration and functionality to a graphical desktop environment that changes grahical configurations or allow a user to perform a...
    Group
    Show

  • Disable Ctrl-Alt-Del Reboot Key Sequence in GNOME3

    By default, <code>GNOME</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed. <br><br> To configure the system to...
    Rule High Severity
    Show

  • Disable Geolocation in GNOME3

    <code>GNOME</code> allows the clock and applications to track and access location information. This setting should be disabled as applications shou...
    Rule Medium Severity
    Show

  • Disable Power Settings in GNOME3

    By default, <code>GNOME</code> enables a power profile designed for mobile devices with battery usage. While useful for mobile devices, this settin...
    Rule Medium Severity
    Show

  • Uninstall abrt-cli Package

    The abrt-cli package can be removed with the following command: 
    $ sudo yum erase abrt-cli
    Rule Low Severity
    Show

  • Uninstall abrt-plugin-logger Package

    The abrt-plugin-logger package can be removed with the following command: 
    $ sudo yum erase abrt-plugin-logger
    Rule Low Severity
    Show

  • Disable User Administration in GNOME3

    By default, <code>GNOME</code> will allow all users to have some administratrion capability. This should be disabled so that non-administrative use...
    Rule High Severity
    Show

  • SAP Specific Requirement

    SAP (Systems, Applications and Products in Data Processing) is enterprise software to manage business operations and customer relations. The follow...
    Group
    Show

  • Sudo

    <code>Sudo</code>, which stands for "su 'do'", provides the ability to delegate authority to certain users, groups of users, or system administrato...
    Group
    Show

  • Group name dedicated to the use of sudo

    Specify the name of the group that should own /usr/bin/sudo.
    Value
    Show

  • Sudo - logfile value

    Specify the sudo logfile to use. The default value used here matches the example location from CIS, which uses /var/log/sudo.log.
    Value
    Show

  • Sudo - passwd_timeout value

    Defines the number of minutes before the <code>sudo</code> password prompt times out. Defining 0 means no timeout. The default timeout value is 5 m...
    Value
    Show

  • Sudo - timestamp_timeout value

    Defines the number of minutes that can elapse before <code>sudo</code> will ask for a passwd again. If set to a value less than 0 the user's time s...
    Value
    Show

  • Sudo - umask value

    Specify the sudo umask to use. The actual umask value that is used is the union of the user's umask and the sudo umask. The default sudo umask is 0...
    Value
    Show

  • Install sudo Package

    The sudo package can be installed with the following command: 
    $ sudo yum install sudo
    Rule Medium Severity
    Show

  • Ensure sudo Runs In A Minimal Environment - sudo env_reset

    The sudo <code>env_reset</code> tag, when specified, will run the command in a minimal environment, containing the TERM, PATH, HOME, MAIL, SHELL, L...
    Rule Medium Severity
    Show

  • Ensure sudo Ignores Commands In Current Dir - sudo ignore_dot

    The sudo <code>ignore_dot</code> tag, when specified, will ignore the current directory in the PATH environment variable. On Red Hat Enterprise Lin...
    Rule Medium Severity
    Show

  • Ensure Privileged Escalated Commands Cannot Execute Other Commands - sudo NOEXEC

    The sudo <code>NOEXEC</code> tag, when specified, prevents user executed commands from executing other commands, like a shell for example. This sho...
    Rule High Severity
    Show

  • Ensure sudo passwd_timeout is appropriate - sudo passwd_timeout

    The sudo <code>passwd_timeout</code> tag sets the amount of time sudo password prompt waits. On Red Hat Enterprise Linux 7, the default <code>passw...
    Rule Medium Severity
    Show

  • Ensure sudo umask is appropriate - sudo umask

    The sudo <code>umask</code> tag, when specified, will be added the to the user's umask in the command environment. On Red Hat Enterprise Linux 7, t...
    Rule Medium Severity
    Show

  • Ensure Only Users Logged In To Real tty Can Execute Sudo - sudo use_pty

    The sudo <code>use_pty</code> tag, when specified, will only execute sudo commands from users logged in to a real tty. This should be enabled by ma...
    Rule Medium Severity
    Show

  • Ensure Sudo Logfile Exists - sudo logfile

    A custom log sudo file can be configured with the 'logfile' tag. This rule configures a sudo custom logfile at the default location suggested by CI...
    Rule Low Severity
    Show

  • Ensure a dedicated group owns sudo

    Restrict the execution of privilege escalated commands to a dedicated group of users. Ensure the group owner of /usr/bin/sudo is <xccdf-1.2:sub xml...
    Rule Medium Severity
    Show

  • Ensure Users Re-Authenticate for Privilege Escalation - sudo !authenticate

    The sudo <code>!authenticate</code> option, when specified, allows a user to execute commands using sudo without having to authenticate. This shoul...
    Rule Medium Severity
    Show

  • Ensure Users Re-Authenticate for Privilege Escalation - sudo NOPASSWD

    The sudo <code>NOPASSWD</code> tag, when specified, allows a user to execute commands using sudo without having to authenticate. This should be dis...
    Rule Medium Severity
    Show

  • Ensure Users Re-Authenticate for Privilege Escalation - sudo

    The sudo <code>NOPASSWD</code> and <code>!authenticate</code> option, when specified, allows a user to execute commands using sudo without having t...
    Rule Medium Severity
    Show

  • Require Re-Authentication When Using the sudo Command

    The sudo <code>timestamp_timeout</code> tag sets the amount of time sudo password prompt waits. The default <code>timestamp_timeout</code> value is...
    Rule Medium Severity
    Show

  • Ensure only owner and members of group owner of /usr/bin/sudo can execute it

    Remove the execute permission bit of <code>/etc/bin/sudo</code> for the other users. To properly set the permissions of <code>/usr/bin/sudo</code>...
    Rule Medium Severity
    Show

  • The operating system must restrict privilege elevation to authorized personnel

    The sudo command allows a user to execute programs with elevated (administrator) privileges. It prompts the user for their password and confirms yo...
    Rule Medium Severity
    Show

  • Ensure the audit Subsystem is Installed

    The audit package should be installed.
    Rule Medium Severity
    Show

  • Uninstall abrt-plugin-rhtsupport Package

    The abrt-plugin-rhtsupport package can be removed with the following command: 
    $ sudo yum erase abrt-plugin-rhtsupport
    Rule Low Severity
    Show

  • Only the VDSM User Can Use sudo NOPASSWD

    The sudo <code>NOPASSWD</code> tag, when specified, allows a user to execute commands using sudo without having to authenticate. Only the <code>vds...
    Rule Medium Severity
    Show

  • Ensure sudo only includes the default configuration directory

    Administrators can configure authorized <code>sudo</code> users via drop-in files, and it is possible to include other directories and configuratio...
    Rule Medium Severity
    Show

  • Explicit arguments in sudo specifications

    All commands in the sudoers file must strictly specify the arguments allowed to be used for a given user. If the command is supposed to be executed...
    Rule Medium Severity
    Show

  • Don't define allowed commands in sudoers by means of exclusion

    Policies applied by sudo through the sudoers file should not involve negation. Each user specification in the <code>sudoers</code> file contains a...
    Rule Medium Severity
    Show

  • Don't target root user in the sudoers file

    The targeted users of a user specification should be, as much as possible, non privileged users (i.e.: non-root). User specifications have to expl...
    Rule Medium Severity
    Show

  • Ensure invoking users password for privilege escalation when using sudo

    The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validate...
    Rule Medium Severity
    Show

  • System Tooling / Utilities

    The following checks evaluate the system for recommended base packages -- both for installation and removal.
    Group
    Show

  • Install binutils Package

    The binutils package can be installed with the following command: 
    $ sudo yum install binutils
    Rule Medium Severity
    Show

  • Ensure gnutls-utils is installed

    The gnutls-utils package can be installed with the following command: 
    $ sudo yum install gnutls-utils
    Rule Medium Severity
    Show

  • Install libcap-ng-utils Package

    The libcap-ng-utils package can be installed with the following command: 
    $ sudo yum install libcap-ng-utils
    Rule Medium Severity
    Show

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