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 implement address space layout randomization to protect its memory from unauthorized code execution.
Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory incl...Rule Medium Severity -
SRG-OS-000437-GPOS-00194
Group -
The Ubuntu operating system must be configured so that Advance Package Tool (APT) removes all software components after updated versions have been installed.
Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may...Rule Medium Severity -
SRG-OS-000445-GPOS-00199
Group -
The Ubuntu operating system must use a file integrity tool to verify correct operation of all security functions.
Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmwar...Rule Medium Severity -
SRG-OS-000447-GPOS-00201
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.
Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the Ubuntu operating system. Changes to Ubuntu operating syste...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
SRG-OS-000480-GPOS-00232
Group -
The Ubuntu operating system must have an application firewall enabled.
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.Rule Medium Severity -
SRG-OS-000259-GPOS-00100
Group -
SRG-OS-000259-GPOS-00100
Group -
The Ubuntu operating system must have system commands owned by root or a system account.
If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that ar...Rule Medium Severity -
SRG-OS-000259-GPOS-00100
Group -
SRG-OS-000480-GPOS-00227
Group -
SRG-OS-000480-GPOS-00227
Group -
The Ubuntu operating system must disable the x86 Ctrl-Alt-Delete key sequence.
A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the...Rule High Severity -
SRG-OS-000480-GPOS-00227
Group -
The Ubuntu operating system must not have accounts configured with blank or null passwords.
If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.Rule High Severity -
SRG-OS-000480-GPOS-00227
Group
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