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Guide to the Secure Configuration of Ubuntu 22.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Uninstall talk Package

    The <code>talk</code> package contains the client program for the Internet talk protocol, which allows the user to chat with other users on different systems. Talk is a communication program which ...
    Rule Medium Severity
    Show

  • Uninstall Samba Package

    The samba package can be removed with the following command: 
     $ apt-get remove samba
    Rule Unknown Severity
    Show

  • SSH is required to be installed

    Specify if the Policy requires SSH to be installed. Used by SSH Rules to determine if SSH should be uninstalled or configured.<br> A value of 0 means that the policy doesn't care if OpenSSH server ...
    Value
    Show

  • Enable the OpenSSH Service

    The SSH server service, sshd, is commonly needed. The sshd service can be enabled with the following command: 
    $ sudo systemctl enable sshd.service
    Rule Medium Severity
    Show

  • Verify Permissions on SSH Server config file

    To properly set the permissions of /etc/ssh/sshd_config, run the command: 
    $ sudo chmod 0600 /etc/ssh/sshd_config
    Rule Medium Severity
    Show

  • Remove SSH Server iptables Firewall exception (Unusual)

    By default, inbound connections to SSH's port are allowed. If the SSH server is not being used, this exception should be removed from the firewall configuration. <br> <br> Edit the files <co...
    Rule Unknown Severity
    Show

  • Set SSH Client Alive Interval

    SSH allows administrators to set a network responsiveness timeout interval. After this interval has passed, the unresponsive client will be automatically logged out. <br> <br> To set this t...
    Rule Medium Severity
    Show

  • Disable Host-Based Authentication

    SSH's cryptographic host-based authentication is more secure than <code>.rhosts</code> authentication. However, it is not recommended that hosts unilaterally trust one another, even within an organ...
    Rule Medium Severity
    Show

  • Disable SSH Support for Rhosts RSA Authentication

    SSH can allow authentication through the obsolete rsh command through the use of the authenticating user's SSH keys. This should be disabled. <br> <br> To ensure this behavior is disabled, ...
    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 capability to encrypt remote X11 connections when SSH...
    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 login. If world- writable permissions are found, lo...
    Rule Medium 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 the following line in <code>/etc/ssh/sshd_config....
    Rule Medium Severity
    Show

  • Use Only FIPS 140-2 Validated Key Exchange Algorithms

    Limit the key exchange algorithms to those which are FIPS-approved. Add or modify the following line in <code>/etc/ssh/sshd_config</code> <pre>KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-ni...
    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> is <code>yes</code>, which prevents remote hosts...
    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 boot into graphical user mode. This prevents the s...
    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 2 command line for the Linux operating system. To...
    Rule Low Severity
    Show

  • 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_limit=8192</code> to the default GRUB 2 command lin...
    Rule Low Severity
    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), add the following line to a file with suffix <cod...
    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), add the following line to a file with suffix <cod...
    Rule Medium Severity
    Show

  • Record Events that Modify User/Group Information - /etc/passwd

    If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default), add the following lines to a file with suffix <co...
    Rule Medium Severity
    Show

Node 2

siemur/test-space

The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.

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