Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Ubuntu operating system must display the Standard Mandatory DOD Notice and Consent Banner before granting local access to the system via a graphical user logon.
Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy and security notification verbiage used is consistent with applicable f...Rule Medium Severity -
SRG-OS-000028-GPOS-00009
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SRG-OS-000030-GPOS-00011
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The Ubuntu operating system must allow users to directly initiate a session lock for all connection types.
A session lock 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 want to log out because of the temporary...Rule Medium Severity -
SRG-OS-000068-GPOS-00036
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The Ubuntu operating system must map the authenticated identity to the user or group account for PKI-based authentication.
Without mapping the certificate used to authenticate to the user account, the ability to determine the identity of the individual user or group will not be available for forensic analysis.Rule High Severity -
SRG-OS-000075-GPOS-00043
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The Ubuntu operating system must enforce 24 hours/1 day as the minimum password lifetime. Passwords for new users must have a 24 hours/1 day minimum password lifetime restriction.
Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually...Rule Low Severity -
SRG-OS-000076-GPOS-00044
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The Ubuntu operating system must enforce a 60-day maximum password lifetime restriction. Passwords for new users must have a 60-day maximum password lifetime restriction.
Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force user...Rule Low Severity -
SRG-OS-000080-GPOS-00048
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The Ubuntu operating system must require users to reauthenticate for privilege escalation or when changing roles.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability...Rule Medium Severity -
SRG-OS-000480-GPOS-00228
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SRG-OS-000104-GPOS-00051
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The Ubuntu operating system must uniquely identify interactive users.
To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational us...Rule Medium Severity -
SRG-OS-000134-GPOS-00068
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The Ubuntu operating system must ensure only users who need access to security functions are part of sudo group.
An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform security functions. Security functions are the hardware, software, a...Rule High Severity -
SRG-OS-000279-GPOS-00109
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SRG-OS-000373-GPOS-00156
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The Ubuntu operating system default filesystem permissions must be defined in such a way that all authenticated users can read and modify only their own files.
Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary access.Rule Medium Severity
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