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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Assign Expiration Date to Temporary Accounts

    Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts. In the event temporary accounts are required, configure the system t...
    Rule Medium Severity
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  • Ensure All Accounts on the System Have Unique Names

    Ensure accounts on the system have unique names. To ensure all accounts have unique names, run the following command: <pre>$ sudo getent passwd | awk -F: '{ print $1}' | uniq -d</pre> If a usernam...
    Rule Medium Severity
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  • Use Centralized and Automated Authentication

    Implement an automated system for managing user accounts that minimizes the risk of errors, either intentional or deliberate. This system should integrate with an existing enterprise user managemen...
    Rule Medium Severity
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  • Ensure shadow Group is Empty

    The shadow group allows system programs which require access the ability to read the /etc/shadow file. No users should be assigned to the shadow group.
    Rule Medium Severity
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  • Policy Requires Immediate Change of Temporary Passwords

    Temporary passwords for Ubuntu 20.04 operating system logons must require an immediate change to a permanent password. Verify that a policy exists that ensures when a user is created, it is creati...
    Rule Medium Severity
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  • maximum password age

    Maximum age of password in days
    Value
    Show

  • minimum password age

    Minimum age of password in days
    Value
    Show

  • minimum password length

    Minimum number of characters in password
    Value
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  • warning days before password expires

    The number of days' warning given before a password expires.
    Value
    Show

  • Set Password Minimum Age

    To specify password minimum age for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MIN_DAYS <xccdf-1.2:sub idref="xccdf_org.ssgproject.con...
    Rule Medium Severity
    Show

  • Set Password Minimum Length in login.defs

    To specify password length requirements for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MIN_LEN <xccdf-1.2:sub idref="xccdf_org.ssgproj...
    Rule Medium Severity
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  • Set Existing Passwords Maximum Age

    Configure non-compliant accounts to enforce a <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_accounts_maximum_age_login_defs" use="legacy"></xccdf-1.2:sub>-day maximum password lifeti...
    Rule Medium Severity
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  • Offload audit Logs to External Media

    The operating system must have a crontab script running weekly to offload audit events of standalone systems.
    Rule Medium Severity
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  • Set Existing Passwords Minimum Age

    Configure non-compliant accounts to enforce a 24 hours/1 day minimum password lifetime by running the following command: 
    $ sudo chage -m 1 USER
    Rule Medium Severity
    Show

  • Verify Proper Storage and Existence of Password Hashes

    By default, password hashes for local accounts are stored in the second field (colon-separated) in <code>/etc/shadow</code>. This file should be readable only by processes running with root credent...
    Group
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  • Verify All Account Password Hashes are Shadowed

    If any password hashes are stored in <code>/etc/passwd</code> (in the second field, instead of an <code>x</code> or <code>*</code>), the cause of this misconfiguration should be investigated. The a...
    Rule Medium Severity
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  • Verify All Account Password Hashes are Shadowed with SHA512

    Verify the operating system requires the shadow password suite configuration be set to encrypt interactive user passwords using a strong cryptographic hash. Check that the interactive user account ...
    Rule Medium Severity
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  • Ensure all users last password change date is in the past

    All users should have a password change date in the past.
    Rule Medium Severity
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  • Ensure sudo group has only necessary members

    Developers and implementers can increase the assurance in security functions by employing well-defined security policy models; structured, disciplined, and rigorous hardware and software developmen...
    Rule Medium Severity
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  • All GIDs referenced in /etc/passwd must be defined in /etc/group

    Add a group to the system for each GID referenced without a corresponding group.
    Rule Low Severity
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