Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000447-GPOS-00201
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must notify designated personnel if baseline configurations are changed in an unauthorized manner. The file integrity tool must notify the System Administrator when changes to the baseline configuration or anomalies in the operation of any security functions are discovered.
<VulnDiscussion>Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must display the date and time of the last successful account logon upon logon.
<VulnDiscussion>Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the sys...Rule Low Severity -
SRG-OS-000480-GPOS-00232
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must have an application firewall enabled.
<VulnDiscussion>Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls ...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must have system commands set to a mode of 0755 or less permissive.
<VulnDiscussion>If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be impl...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must have system commands owned by root or a system account.
<VulnDiscussion>If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be impl...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must have system commands group-owned by root or a system account.
<VulnDiscussion>If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be impl...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must disable the x86 Ctrl-Alt-Delete key sequence if a graphical user interface is installed.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must disable the x86 Ctrl-Alt-Delete key sequence.
<VulnDiscussion>A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must not have accounts configured with blank or null passwords.
<VulnDiscussion>If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with ...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Ubuntu operating system must not allow accounts configured with blank or null passwords.
<VulnDiscussion>If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with ...Rule High Severity
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