Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide (STIG) V1R9
Rules and Groups employed by this XCCDF Profile
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Set Password Hashing Algorithm
The system's default algorithm for storing password hashes in/etc/shadowis SHA-512. This can be configured in several locations.Group -
Set Password Hashing Algorithm in /etc/login.defs
In <code>/etc/login.defs</code>, add or correct the following line to ensure the system will use <xccdf-1.2:sub idref="xccdf_org.ssgproject.content...Rule Medium Severity -
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 co...Group -
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 ...Rule High Severity -
Disable Ctrl-Alt-Del Reboot Activation
By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed. <br><br> To configure the system ...Rule High Severity -
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 educ...Group -
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 in...Group -
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 th...Rule Medium Severity -
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. I...Group -
Install the opensc Package For Multifactor Authentication
Theopensc-pkcs11package can be installed with the following command:$ apt-get install opensc-pkcs11
Rule Medium Severity -
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>li...Rule Medium Severity -
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>...Rule Medium Severity -
Configure Smart Card Certificate Status Checking
Configure the operating system to do certificate status checking for PKI authentication. Modify all of the <code>cert_policy</code> lines in <code>...Rule Medium Severity -
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. M...Rule Medium Severity -
Enable Smart Card Logins in PAM
This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g....Rule Medium Severity -
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<...Rule Low Severity -
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 ...Group -
Set Account Expiration Parameters
Accounts can be configured to be automatically disabled after a certain time period, meaning that they will require administrator interaction to be...Group -
Set Account Expiration Following Inactivity
To specify the number of days after a password expires (which signifies inactivity) until an account is permanently disabled, add or correct the fo...Rule Medium Severity -
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 tempo...Rule Medium Severity -
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...Rule Medium Severity -
Set Password Expiration Parameters
The file <code>/etc/login.defs</code> controls several password-related settings. Programs such as <code>passwd</code>, <code>su</code>, and <code>...Group -
Set Password Maximum Age
To specify password maximum age for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MAX_D...Rule Medium Severity -
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_D...Rule Medium Severity -
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 re...Group -
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, discipli...Rule Medium Severity -
Ensure no duplicate UIDs exist
Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passw...Rule Medium Severity -
Prevent Login to Accounts With Empty Password
If an account is configured for password authentication but does not have an assigned password, it may be possible to log into the account without ...Rule High Severity -
Ensure There Are No Accounts With Blank or Null Passwords
Check the "/etc/shadow" file for blank passwords with the following command: <pre>$ sudo awk -F: '!$2 {print $1}' /etc/shadow</pre> If the command ...Rule High Severity -
Restrict Root Logins
Direct root logins should be allowed only for emergency use. In normal situations, the administrator should access the system via a unique unprivil...Group -
Direct root Logins Are Not Allowed
Configure the operating system to prevent direct logins to the <code>root</code> account by performing the following operations: <pre>$ sudo passwd...Rule Medium Severity -
Secure Session Configuration Files for Login Accounts
When a user logs into a Unix account, the system configures the user's session by reading a number of files. Many of these files are located in the...Group -
Limit the Number of Concurrent Login Sessions Allowed Per User
Limiting the number of allowed users and sessions per user can limit risks related to Denial of Service attacks. This addresses concurrent sessions...Rule Low Severity -
Set Interactive Session Timeout
Setting the <code>TMOUT</code> option in <code>/etc/profile</code> ensures that all user sessions will terminate based on inactivity. The value of ...Rule Medium Severity -
Ensure that Users Have Sensible Umask Values
The umask setting controls the default permissions for the creation of new files. With a default <code>umask</code> setting of 077, files and direc...Group -
Ensure the Default Umask is Set Correctly in login.defs
To ensure the default umask controlled by <code>/etc/login.defs</code> is set properly, add or correct the <code>UMASK</code> setting in <code>/etc...Rule Medium Severity -
System Accounting with auditd
The audit service provides substantial capabilities for recording system activities. By default, the service audits about SELinux AVC denials and c...Group -
Ensure the default plugins for the audit dispatcher are Installed
The audit-audispd-plugins package should be installed.Rule Medium Severity -
Ensure the audit Subsystem is Installed
The audit package should be installed.Rule Medium Severity -
Enable auditd Service
The <code>auditd</code> service is an essential userspace component of the Linux Auditing System, as it is responsible for writing audit records to...Rule Medium Severity -
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...Rule Low Severity -
Configure auditd Rules for Comprehensive Auditing
The <code>auditd</code> program can perform comprehensive monitoring of system activity. This section describes recommended configuration settings ...Group -
Record Attempts to Alter Process and Session Initiation Information btmp
The audit system already collects process information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>auge...Rule Medium Severity -
Record Attempts to Alter Process and Session Initiation Information utmp
The audit system already collects process information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>auge...Rule Medium Severity -
Record Attempts to Alter Process and Session Initiation Information wtmp
The audit system already collects process information for all users and root. If the <code>auditd</code> daemon is configured to use the <code>auge...Rule Medium Severity -
Record Events When Privileged Executables Are Run
Verify the system generates an audit record when privileged functions are executed. If audit is using the "auditctl" tool to load the rules, run t...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/group
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/gshadow
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
Record Events that Modify User/Group Information - /etc/security/opasswd
If the <code>auditd</code> daemon is configured to use the <code>augenrules</code> program to read audit rules during daemon startup (the default),...Rule Medium Severity -
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),...Rule Medium Severity
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