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CIS Ubuntu 20.04 Level 2 Server Benchmark

Rules and Groups employed by this XCCDF Profile

  • Rlogin, Rsh, and Rexec

    The Berkeley r-commands are legacy services which allow cleartext remote access and have an insecure trust model.
    Group
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  • Uninstall rsh Package

    The rsh-client package contains the client commands for the rsh services
    Rule Unknown Severity
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  • Remove Rsh Trust Files

    The files <code>/etc/hosts.equiv</code> and <code>~/.rhosts</code> (in each user's home directory) list remote hosts and users that are trusted by ...
    Rule High Severity
    Show

  • Chat/Messaging Services

    The talk software makes it possible for users to send and receive messages across systems through a terminal session.
    Group
    Show

  • 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 differe...
    Rule Medium Severity
    Show

  • Telnet

    The telnet protocol does not provide confidentiality or integrity for information transmitted on the network. This includes authentication informat...
    Group
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  • Remove telnet Clients

    The telnet client allows users to start connections to other systems via the telnet protocol.
    Rule Low Severity
    Show

  • Print Support

    The Common Unix Printing System (CUPS) service provides both local and network printing support. A system running the CUPS service can accept print...
    Group
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  • Uninstall CUPS Package

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

  • Disable the CUPS Service

    The cups service can be disabled with the following command: 
    $ sudo systemctl mask --now cups.service
    Rule Unknown Severity
    Show

  • Proxy Server

    A proxy server is a very desirable target for a potential adversary because much (or all) sensitive data for a given infrastructure may flow throug...
    Group
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  • Disable Squid if Possible

    If Squid was installed and activated, but the system does not need to act as a proxy server, then it should be disabled and removed.
    Group
    Show

  • Uninstall squid Package

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

  • Samba(SMB) Microsoft Windows File Sharing Server

    When properly configured, the Samba service allows Linux systems to provide file and print sharing to Microsoft Windows systems. There are two soft...
    Group
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  • Disable Samba if Possible

    Even after the Samba server package has been installed, it will remain disabled. Do not enable this service unless it is absolutely necessary to pr...
    Group
    Show

  • Uninstall Samba Package

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

  • SNMP Server

    The Simple Network Management Protocol allows administrators to monitor the state of network devices, including computers. Older versions of SNMP w...
    Group
    Show

  • Disable SNMP Server if Possible

    The system includes an SNMP daemon that allows for its remote monitoring, though it not installed by default. If it was installed and activated but...
    Group
    Show

  • Uninstall net-snmp Package

    The <code>snmp</code> package provides the snmpd service. The <code>snmp</code> package can be removed with the following command: <pre> $ apt-get...
    Rule Unknown Severity
    Show

  • SSH Server

    The SSH protocol is recommended for remote login and remote file transfer. SSH provides confidentiality and integrity for data exchanged between tw...
    Group
    Show

  • Verify Group Who Owns SSH Server config file

    To properly set the group owner of /etc/ssh/sshd_config, run the command: 
    $ sudo chgrp root /etc/ssh/sshd_config
    Rule Medium Severity
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  • Verify Owner on SSH Server config file

    To properly set the owner of /etc/ssh/sshd_config, run the command: 
    $ sudo chown root /etc/ssh/sshd_config
    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

  • Verify Permissions on SSH Server Private *_key Key Files

    SSH server private keys - files that match the <code>/etc/ssh/*_key</code> glob, have to have restricted permissions. If those files are owned by t...
    Rule Medium Severity
    Show

  • Verify Permissions on SSH Server Public *.pub Key Files

    To properly set the permissions of /etc/ssh/*.pub, run the command: 
    $ sudo chmod 0644 /etc/ssh/*.pub
    Rule Medium Severity
    Show

  • Configure OpenSSH Server if Necessary

    If the system needs to act as an SSH server, then certain changes should be made to the OpenSSH daemon configuration file <code>/etc/ssh/sshd_confi...
    Group
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  • Set SSH Client Alive Count Max

    The SSH server sends at most <code>ClientAliveCountMax</code> messages during a SSH session and waits for a response from the SSH client. The optio...
    Rule Medium Severity
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  • 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 automat...
    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 un...
    Rule Medium Severity
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  • Disable SSH Access via Empty Passwords

    Disallow SSH login with empty passwords. The default SSH configuration disables logins with empty passwords. The appropriate configuration is used ...
    Rule High Severity
    Show

  • Disable SSH Support for .rhosts Files

    SSH can emulate the behavior of the obsolete rsh command in allowing users to enable insecure access to their accounts via <code>.rhosts</code> fil...
    Rule Medium Severity
    Show

  • 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 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
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  • 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
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  • 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 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
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  • 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
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  • 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
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  • 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
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  • 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
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  • Use Only FIPS 140-2 Validated Ciphers

    Limit the ciphers to those algorithms which are FIPS-approved. Counter (CTR) mode is also preferred over cipher-block chaining (CBC) mode. The foll...
    Rule Medium Severity
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  • Use Only FIPS 140-2 Validated MACs

    Limit the MACs to those hash algorithms which are FIPS-approved. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of FIPS-a...
    Rule Medium Severity
    Show

  • Use Only Strong Key Exchange algorithms

    Limit the Key Exchange to strong algorithms. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of those: <pre>KexAlgorithms ...
    Rule Medium Severity
    Show

  • X Window System

    The X Window System implementation included with the system is called X.org.
    Group
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  • Disable X Windows

    Unless there is a mission-critical reason for the system to run a graphical user interface, ensure X is not set to start automatically at boot and ...
    Group
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  • 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

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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