Guide to the Secure Configuration of Red Hat Enterprise Linux 8
Rules, Groups, and Values defined within the XCCDF Benchmark
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GNOME Remote Access Settings
GNOME remote access settings that apply to the graphical interface.Group -
Require Credential Prompting for Remote Access in GNOME3
By default, <code>GNOME</code> does not require credentials when using <code>Vino</code> for remote access. To configure the system to require remote credentials, add or set <code>authentication-me...Rule Medium Severity -
tally2_unlock_time
Seconds before automatic unlocking or permanently locking after excessive failed loginsValue -
Require Encryption for Remote Access in GNOME3
By default, <code>GNOME</code> requires encryption when using <code>Vino</code> for remote access. To prevent remote access encryption from being disabled, add or set <code>require-encryption</code...Rule Medium Severity -
Screensaver Inactivity timeout
Choose allowed duration (in seconds) of inactive graphical sessionsValue -
Screensaver Lock Delay
Choose allowed duration (in seconds) after a screensaver becomes active before displaying an authentication promptValue -
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-activation-enabled</pre> to <code>/etc/dconf/db/local....Rule Medium Severity -
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 configuration file(s) in the <code>/etc/dconf/db/...Rule Medium Severity -
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 <code>uint32 <xccdf-1.2:sub idref="xccdf_org.ssgproje...Rule Medium Severity -
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 should be enabled by making sure that the <code>NOEXE...Rule High Severity -
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 <code>/etc/dconf/db/local.d/00-security-settings</co...Rule Medium Severity -
Ensure Users Cannot Change GNOME3 Screensaver Lock After Idle Period
If not already configured, ensure that users cannot change GNOME3 screensaver lock settings by adding <pre>/org/gnome/desktop/screensaver/lock-enabled</pre> to <code>/etc/dconf/db/local.d/locks/00-...Rule Medium Severity -
Implement Blank Screensaver
To set the screensaver mode in the GNOME3 desktop to a blank screen, add or set <code>picture-uri</code> to <code>string ''</code> in <code>/etc/dconf/db/local.d/00-security-settings</code>. For...Rule Medium Severity -
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 seeing who has access to the system. This can be dis...Rule Medium Severity -
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-delay</code> to <code>/etc/dconf/db/local.d/locks/00-...Rule Medium Severity -
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> to <code>/etc/dconf/db/local.d/locks/00-security...Rule Medium Severity -
GNOME System Settings
GNOME provides configuration and functionality to a graphical desktop environment that changes grahical configurations or allow a user to perform actions that users normally would not be able to do...Group -
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 should not track system location. To configure the sys...Rule Medium Severity -
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 setting should be disabled for all other systems. To con...Rule Medium Severity -
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 users are not making configuration changes. To config...Rule High Severity -
Group name dedicated to the use of sudo
Specify the name of the group that should own /usr/bin/sudo.Value -
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 -
Sudo - passwd_timeout value
Defines the number of minutes before thesudopassword prompt times out. Defining 0 means no timeout. The default timeout value is 5 minutes.Value -
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 stamp will never expire. Defining 0 means always pr...Value -
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 0022. This guarantess sudo never lowers the umask w...Value -
Install sudo Package
Thesudopackage can be installed with the following command:$ sudo yum install sudo
Rule Medium Severity -
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, LOGNAME, USER and SUDO_* variables. On Red Hat Ente...Rule Medium Severity -
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 making sure that the <code>requiretty</code> tag ...Rule Medium Severity -
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 8, the default <code>umask</code> value is 0022. The ...Rule Medium Severity -
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 making sure that the <code>use_pty</code> tag exists...Rule Medium Severity -
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 CIS, which uses /var/log/sudo.log.Rule Low Severity -
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 xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2...Rule Medium Severity -
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 should be disabled by making sure that the <code>!authe...Rule Medium Severity -
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 disabled by making sure that the <code>NOPASSWD</code...Rule Medium Severity -
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 to authenticate. This should be disabled by making ...Rule Medium Severity -
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>vdsm</code> user should have this capability in any s...Rule Medium Severity -
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 configuration files from the file currently being parsed. Mak...Rule Medium Severity -
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 only without arguments, pass "" as an argument in...Rule Medium Severity -
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 comma-delimited list of command specifications. T...Rule Medium Severity -
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 explicitly list the runas spec (i.e. the list of targe...Rule Medium Severity -
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 validates the invoking user's credentials. The expected ou...Rule Medium Severity -
System Tooling / Utilities
The following checks evaluate the system for recommended base packages -- both for installation and removal.Group -
Ensure gnutls-utils is installed
Thegnutls-utilspackage can be installed with the following command:$ sudo yum install gnutls-utils
Rule Medium Severity -
Install libcap-ng-utils Package
Thelibcap-ng-utilspackage can be installed with the following command:$ sudo yum install libcap-ng-utils
Rule Medium Severity -
Ensure nss-tools is installed
Thenss-toolspackage can be installed with the following command:$ sudo yum install nss-tools
Rule Medium Severity -
Install openscap-scanner Package
Theopenscap-scannerpackage can be installed with the following command:$ sudo yum install openscap-scanner
Rule Medium Severity -
Install rear Package
Therearpackage can be installed with the following command:$ sudo yum install rear
Rule Medium Severity -
Install rng-tools Package
Therng-toolspackage can be installed with the following command:$ sudo yum install rng-tools
Rule Low Severity -
Install subscription-manager Package
Thesubscription-managerpackage can be installed with the following command:$ sudo yum install subscription-manager
Rule Medium Severity -
Install tar Package
Thetarpackage can be installed with the following command:$ sudo yum install tar
Rule Medium Severity
Node 2
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