Skip to content
Log In

Guide to the Secure Configuration of Ubuntu 22.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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
    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 5 minutes. The timestamp_timeout should be config...
    Rule Medium 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>vdsm</code> user should have this capability in any s...
    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 comma-delimited list of command specifications. T...
    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 explicitly list the runas spec (i.e. the list of targe...
    Rule Medium Severity
    Show

  • System Tooling / Utilities

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

  • Ensure nss-tools is installed

    The nss-tools package can be installed with the following command: 
    $ apt-get install nss-tools
    Rule Medium Severity
    Show

  • Ensure apt_get Removes Previous Package Versions

    <code>apt_get</code> should be configured to remove previous software components after new versions have been installed. To configure <code>apt_get</code> to remove the previous software component...
    Rule Low Severity
    Show

  • Account and Access Control

    In traditional Unix security, if an attacker gains shell access to a certain login account, they can perform any action or access any file to which that account has access. Therefore, making it mor...
    Group
    Show

  • Warning Banners for System Accesses

    Each system should expose as little information about itself as possible. <br> <br> System banners, which are typically displayed just before a login prompt, give out information about the s...
    Group
    Show

  • Login Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
    Value
    Show

  • MotD Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
    Value
    Show

  • Remote Login Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
    Value
    Show

  • Modify the System Message of the Day Banner

    To configure the system message banner edit <code>/etc/motd</code>. Replace the default text with a message compliant with the local site policy or a legal disclaimer. The DoD required text is eit...
    Rule Medium Severity
    Show

  • Verify Group Ownership of System Login Banner

    To properly set the group owner of /etc/issue, run the command: 
    $ sudo chgrp root /etc/issue
    Rule Medium Severity
    Show

  • Verify Group Ownership of System Login Banner for Remote Connections

    To properly set the group owner of /etc/issue.net, run the command: 
    $ sudo chgrp root /etc/issue.net
    Rule Medium Severity
    Show

  • Verify Group Ownership of Message of the Day Banner

    To properly set the group owner of /etc/motd, run the command: 
    $ sudo chgrp root /etc/motd
    Rule Medium Severity
    Show

  • Verify ownership of System Login Banner

    To properly set the owner of /etc/issue, run the command: 
    $ sudo chown root /etc/issue
    Rule Medium Severity
    Show

  • Verify ownership of System Login Banner for Remote Connections

    To properly set the owner of /etc/issue.net, run the command: 
    $ sudo chown root /etc/issue.net
    Rule Medium Severity
    Show

  • Verify ownership of Message of the Day Banner

    To properly set the owner of /etc/motd, run the command: 
    $ sudo chown root /etc/motd
    Rule Medium Severity
    Show

  • Verify permissions on Message of the Day Banner

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

  • Implement a GUI Warning Banner

    In the default graphical environment, users logging directly into the system are greeted with a login screen provided by the GNOME Display Manager (GDM). The warning banner should be displayed in t...
    Group
    Show

  • Set the GNOME3 Login Warning Banner Text

    In the default graphical environment, configuring the login warning banner text in the GNOME Display Manager's login screen can be configured on the login screen by setting <code>banner-message-tex...
    Rule Medium Severity
    Show

  • Password Hashing algorithm

    Specify the system default encryption algorithm for encrypting passwords. Defines the value set as ENCRYPT_METHOD in /etc/login.defs.
    Value
    Show

  • remember

    The last n passwords for each user are saved in <code>/etc/security/opasswd</code> in order to force password change history and keep the user from alternating between the same password too frequen...
    Value
    Show

  • Action for auditd to take when disk is full

    'The setting for disk_full_action in /etc/audit/auditd.conf, if multiple values are allowed write them separated by pipes as in "syslog|single|halt", for remediations the first value will be taken'
    Value
    Show

  • Disallow Configuration to Bypass Password Requirements for Privilege Escalation

    Verify the operating system is not configured to bypass password requirements for privilege escalation. Check the configuration of the "/etc/pam.d/sudo" file with the following command: <pre>$ sudo...
    Rule Medium Severity
    Show

  • fail_deny

    Number of failed login attempts before account lockout
    Value
    Show

  • faillock directory

    The directory where the user files with the failure records are kept
    Value
    Show

  • fail_interval

    Interval for counting failed login attempts before account lockout
    Value
    Show

  • fail_unlock_time

    Seconds before automatic unlocking or permanently locking after excessive failed logins
    Value
    Show

  • faildelay_delay

    Delay next login attempt after a failed login
    Value
    Show

  • pwhistory_remember

    Prevent password re-use using password history lookup
    Value
    Show

  • Account Lockouts Must Be Logged

    PAM faillock locks an account due to excessive password failures, this event must be logged.
    Rule Medium Severity
    Show

  • Account Lockouts Must Persist

    By setting a `dir` in the faillock configuration account lockouts will persist across reboots.
    Rule Medium Severity
    Show

  • Limit Password Reuse

    Do not allow users to reuse recent passwords. This can be accomplished by using the remember option for the pam_unix or pam_pwhistory PAM modules.
    Rule Medium Severity
    Show

  • Account Lockouts Must Be Logged

    PAM faillock locks an account due to excessive password failures, this event must be logged.
    Rule Medium Severity
    Show

  • Set Interval For Counting Failed Password Attempts

    Utilizing <code>pam_faillock.so</code>, the <code>fail_interval</code> directive configures the system to lock out an account after a number of incorrect login attempts within a specified time peri...
    Rule Medium Severity
    Show

  • Set Password Quality Requirements

    The default <code>pam_pwquality</code> PAM module provides strength checking for passwords. It performs a number of checks, such as making sure passwords are not similar to dictionary words, are of...
    Group
    Show

  • Set Password Quality Requirements with pam_pwquality

    The <code>pam_pwquality</code> PAM module can be configured to meet requirements for a variety of policies. <br> <br> For example, to configure <code>pam_pwquality</code> to require at lea...
    Group
    Show

  • dcredit

    Minimum number of digits in password
    Value
    Show

  • dictcheck

    Prevent the use of dictionary words for passwords.
    Value
    Show

  • difok

    Minimum number of characters not present in old password
    Value
    Show

  • lcredit

    Minimum number of lower case in password
    Value
    Show

  • minclass

    Minimum number of categories of characters that must exist in a password
    Value
    Show

  • minlen

    Minimum number of characters in password
    Value
    Show

  • ocredit

    Minimum number of other (special characters) in password
    Value
    Show

  • retry

    Number of retry attempts before erroring out
    Value
    Show

  • Ensure PAM Enforces Password Requirements - Minimum Lowercase Characters

    The pam_pwquality module's <code>lcredit</code> parameter controls requirements for usage of lowercase letters in a password. When set to a negative number, any password will be required to contain...
    Rule Medium Severity
    Show

  • Ensure PAM Enforces Password Requirements - Minimum Length

    The pam_pwquality module's <code>minlen</code> parameter controls requirements for minimum characters required in a password. Add <code>minlen=<xccdf-1.2:sub idref="xccdf_org.ssgproject.content_val...
    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.

Capacity
Modules