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Guide to the Secure Configuration of Ubuntu 20.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Ensure PAM Enforces Password Requirements - Authentication Retry Prompts Permitted Per-Session

    To configure the number of retry prompts that are permitted per-session: Edit the <code>pam_pwquality.so</code> statement in <code>/etc/pam.d/common-password</code> to show <code>retry=<xccdf-1...
    Rule Medium Severity
    Show

  • Ensure PAM Enforces Password Requirements - Minimum Uppercase Characters

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

  • Set Password Hashing Algorithm

    The system's default algorithm for storing password hashes in /etc/shadow is SHA-512. This can be configured in several locations.
    Group
    Show

  • Set Password Hashing Algorithm in /etc/login.defs

    In <code>/etc/login.defs</code>, add or update the following line to ensure the system will use <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_password_hashing_algorithm" use="legacy"...
    Rule Medium Severity
    Show

  • Protect Physical Console Access

    It is impossible to fully protect a system from an attacker with physical access, so securing the space in which the system is located should be considered a necessary step. However, there are some...
    Group
    Show

  • Disable Ctrl-Alt-Del Burst Action

    By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed Ctrl-Alt-Delete more than 7 times in 2 seconds. <br> <br> To configure the s...
    Rule High Severity
    Show

  • Configure Screen Locking

    When a user must temporarily leave an account logged-in, screen locking should be employed to prevent passersby from abusing the account. User education and training is particularly important for s...
    Group
    Show

  • Configure Console Screen Locking

    A console screen locking mechanism is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not logout because of th...
    Group
    Show

  • Check that vlock is installed to allow session locking

    The Ubuntu 20.04 operating system must have vlock installed to allow for session locking. The <code>vlock</code> package can be installed with the following command: <pre> $ apt-get install vlock...
    Rule Medium Severity
    Show

  • Hardware Tokens for Authentication

    The use of hardware tokens such as smart cards for system login provides stronger, two-factor authentication than using a username and password. In Red Hat Enterprise Linux servers and workstation...
    Group
    Show

  • Install the opensc Package For Multifactor Authentication

    The opensc-pkcs11 package can be installed with the following command: 
    $ apt-get install opensc-pkcs11
    Rule Medium Severity
    Show

  • Install Smart Card Packages For Multifactor Authentication

    Configure the operating system to implement multifactor authentication by installing the required package with the following command: The <code>libpam-pkcs11</code> package can be installed with t...
    Rule Medium Severity
    Show

  • Configure Smart Card Certificate Authority Validation

    Configure the operating system to do certificate status checking for PKI authentication. Modify all of the <code>cert_policy</code> lines in <code>/etc/pam_pkcs11/pam_pkcs11.conf</code> to include ...
    Rule Medium Severity
    Show

  • Configure Smart Card Local Cache of Revocation Data

    Configure the operating system for PKI-based authentication to use local revocation data when unable to access the network to obtain it remotely. Modify all of the <code>cert_policy</code> lines in...
    Rule Medium Severity
    Show

  • Verify that 'use_mappers' is set to 'pwent' in PAM

    The operating system must map the authenticated identity to the user or group account for PKI-based authentication. Verify that <code>use_mappers</code> is set to <code>pwent</code> in <code>/etc/...
    Rule Low Severity
    Show

  • Protect Accounts by Restricting Password-Based Login

    Conventionally, Unix shell accounts are accessed by providing a username and password to a login program, which tests these values for correctness using the <code>/etc/passwd</code> and <code>/etc/...
    Group
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  • Ensure All Accounts on the System Have Unique User IDs

    Change user IDs (UIDs), or delete accounts, so each has a unique name.
    Rule Medium Severity
    Show

  • Ensure All Groups on the System Have Unique Group ID

    Change the group name or delete groups, so each has a unique id.
    Rule Medium Severity
    Show

  • Ensure All Groups on the System Have Unique Group Names

    Change the group name or delete groups, so each has a unique name.
    Rule Medium Severity
    Show

  • number of days after a password expires until the account is permanently disabled

    The number of days to wait after a password expires, until the account will be permanently disabled.
    Value
    Show

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