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Guide to the Secure Configuration of Red Hat Enterprise Linux 10

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Disable SSH Root Login

    The root user should never be allowed to login to a system directly over a network. To disable root login via SSH, add or correct the following lin...
    Rule Medium Severity
    Show

  • Disable SSH TCP Forwarding

    The <code>AllowTcpForwarding</code> parameter specifies whether TCP forwarding is permitted. To disable TCP forwarding, add or correct the followin...
    Rule Medium Severity
    Show

  • Disable SSH Support for User Known Hosts

    SSH can allow system users to connect to systems if a cache of the remote systems public keys is available. This should be disabled. <br> ...
    Rule Medium Severity
    Show

  • Disable X11 Forwarding

    The X11Forwarding parameter provides the ability to tunnel X11 traffic through the connection to enable remote graphic connections. SSH has the cap...
    Rule Medium Severity
    Show

  • Do Not Allow SSH Environment Options

    Ensure that users are not able to override environment variables of the SSH daemon. <br> The default SSH configuration disables environment process...
    Rule Medium Severity
    Show

  • Enable PAM

    UsePAM Enables the Pluggable Authentication Module interface. If set to “yes” this will enable PAM authentication using ChallengeResponseAuthentica...
    Rule Medium Severity
    Show

  • Enable Public Key Authentication

    Enable SSH login with public keys. <br> The default SSH configuration enables authentication based on public keys. The appropriate configuration is...
    Rule Medium Severity
    Show

  • Enable Use of Strict Mode Checking

    SSHs <code>StrictModes</code> option checks file and ownership permissions in the user's home directory <code>.ssh</code> folder before accepting l...
    Rule Medium Severity
    Show

  • Enable SSH Warning Banner

    To enable the warning banner and ensure it is consistent across the system, add or correct the following line in <code>/etc/ssh/sshd_config.d/00-...
    Rule Medium Severity
    Show

  • Enable SSH Warning Banner

    To enable the warning banner and ensure it is consistent across the system, add or correct the following line in <code>/etc/ssh/sshd_config</code>...
    Rule Medium Severity
    Show

  • Limit Users' SSH Access

    By default, the SSH configuration allows any user with an account to access the system. There are several options available to limit which users an...
    Rule Unknown Severity
    Show

  • Enable SSH Print Last Log

    Ensure that SSH will display the date and time of the last successful account logon. <br> The default SSH configuration enables print of the date a...
    Rule Medium Severity
    Show

  • Force frequent session key renegotiation

    The <code>RekeyLimit</code> parameter specifies how often the session key of the is renegotiated, both in terms of amount of data that may be trans...
    Rule Medium Severity
    Show

  • Ensure SSH LoginGraceTime is configured

    The <code>LoginGraceTime</code> parameter to the SSH server specifies the time allowed for successful authentication to the SSH server. The longer ...
    Rule Medium Severity
    Show

  • Set LogLevel to INFO

    The INFO parameter specifices that record login and logout activity will be logged. <br> The default SSH configuration sets the log level to INFO. ...
    Rule Low Severity
    Show

  • Set SSH Daemon LogLevel to VERBOSE

    The <code>VERBOSE</code> parameter configures the SSH daemon to record login and logout activity. To specify the log level in SSH, add or correct t...
    Rule Medium Severity
    Show

  • Set SSH authentication attempt limit

    The <code>MaxAuthTries</code> parameter specifies the maximum number of authentication attempts permitted per connection. Once the number of failur...
    Rule Medium Severity
    Show

  • Set SSH MaxSessions limit

    The <code>MaxSessions</code> parameter specifies the maximum number of open sessions permitted from a given connection. To set MaxSessions edit <co...
    Rule Medium Severity
    Show

  • Ensure SSH MaxStartups is configured

    The MaxStartups parameter specifies the maximum number of concurrent unauthenticated connections to the SSH daemon. Additional connections will be ...
    Rule Medium Severity
    Show

  • Distribute the SSH Server configuration to multiple files in a config directory.

    Make sure to have the <code>Include /etc/ssh/sshd_config.d/*.conf</code> line in the <code>/etc/ssh/sshd_config</code> file. Ideally, don't have an...
    Rule Medium Severity
    Show

  • Enable Use of Privilege Separation

    When enabled, SSH will create an unprivileged child process that has the privilege of the authenticated user. To enable privilege separation in SSH...
    Rule Medium Severity
    Show

  • Use Only Strong MACs

    Limit the MACs to strong hash algorithms. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of those MACs: <pre>MACs <xccdf-...
    Rule Medium Severity
    Show

  • Prevent remote hosts from connecting to the proxy display

    The SSH daemon should prevent remote hosts from connecting to the proxy display. <br> The default SSH configuration for <code>X11UseLocalhost</code...
    Rule Medium Severity
    Show

  • System Security Services Daemon

    The System Security Services Daemon (SSSD) is a system daemon that provides access to different identity and authentication providers such as Red H...
    Group
    Show

  • SSSD certificate_verification option

    Value of the certificate_verification option in the SSSD config.
    Value
    Show

  • Install the SSSD Package

    The <code>sssd</code> package should be installed. The <code>sssd</code> package can be installed with the following command: <pre> $ sudo dnf inst...
    Rule Medium Severity
    Show

  • Enable the SSSD Service

    The SSSD service should be enabled. The <code>sssd</code> service can be enabled with the following command: <pre>$ sudo systemctl enable sssd.ser...
    Rule Medium Severity
    Show

  • Certificate status checking in SSSD

    Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-ba...
    Rule Medium Severity
    Show

  • Enable Certmap in SSSD

    SSSD should be configured to verify the certificate of the user or group. To set this up ensure that section like <code>certmap/testing.test/rule_...
    Rule Medium Severity
    Show

  • Enable Smartcards in SSSD

    SSSD should be configured to authenticate access to the system using smart cards. To enable smart cards in SSSD, set <code>pam_cert_auth</code> to ...
    Rule Medium Severity
    Show

  • SSSD Has a Correct Trust Anchor

    SSSD must have acceptable trust anchor present.
    Rule Medium Severity
    Show

  • Remove the X Windows Package Group

    By removing the xorg-x11-server-common package, the system no longer has X Windows installed. If X Windows is not installed then the system cannot ...
    Rule Medium Severity
    Show

  • Disable graphical user interface

    By removing the following packages, the system no longer has X Windows installed. <code>xorg-x11-server-Xorg xorg-x11-server-common xorg-x11-serv...
    Rule Medium Severity
    Show

  • Disable X Windows Startup By Setting Default Target

    Systems that do not require a graphical user interface should only boot by default into <code>multi-user.target</code> mode. This prevents accident...
    Rule Medium Severity
    Show

  • System Accounting with auditd

    The audit service provides substantial capabilities for recording system activities. By default, the service audits about SELinux AVC denials and c...
    Group
    Show

  • Install audispd-plugins Package

    The audispd-plugins package can be installed with the following command: 
    $ sudo dnf install audispd-plugins
    Rule Medium Severity
    Show

  • Ensure the audit-libs package as a part of audit Subsystem is Installed

    The audit-libs package should be installed.
    Rule Medium Severity
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  • Ensure the audit Subsystem is Installed

    The audit package should be installed.
    Rule Medium Severity
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  • Enable auditd Service

    The <code>auditd</code> service is an essential userspace component of the Linux Auditing System, as it is responsible for writing audit records to...
    Rule Medium Severity
    Show

  • Enable Auditing for Processes Which Start Prior to the Audit Daemon

    To ensure all processes can be audited, even those which start prior to the audit daemon, add the argument <code>audit=1</code> to the default GRUB...
    Rule Low Severity
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  • Extend Audit Backlog Limit for the Audit Daemon

    To improve the kernel capacity to queue all log events, even those which occurred prior to the audit daemon, add the argument <code>audit_backlog_l...
    Rule Low Severity
    Show

  • Configure auditd Rules for Comprehensive Auditing

    The <code>auditd</code> program can perform comprehensive monitoring of system activity. This section describes recommended configuration settings ...
    Group
    Show

  • Audit failure mode

    This variable is the setting for the -f option in Audit configuration which sets the failure mode of audit. This option lets you determine how you ...
    Value
    Show

  • Make the auditd Configuration Immutable

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Mandatory Access Controls

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Mandatory Access Controls in usr/share

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...
    Rule Medium Severity
    Show

  • Ensure auditd Collects Information on Exporting to Media (successful)

    At a minimum, the audit system should collect media exportation events for all users and root. If the <code>auditd</code> daemon is configured to u...
    Rule Medium Severity
    Show

  • System Audit Logs Must Have Mode 0750 or Less Permissive

    If <code>log_group</code> in <code>/etc/audit/auditd.conf</code> is set to a group other than the <code>root</code> group account, change the mode...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Network Environment

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...
    Rule Medium Severity
    Show

  • Record Events that Modify the System's Network Environment

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...
    Rule Medium Severity
    Show

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