Check: UBTU-20-010439
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010439
(in versions v1 r12 through v1 r1)
Title
The Ubuntu operating system must be configured to use AppArmor. (Cat II impact)
Discussion
Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may provide a capability that runs counter to the mission or provides users with functionality that exceeds mission requirements. This includes functions and services installed at the operating system-level. Some of the programs, installed by default, may be harmful or may not be necessary to support essential organizational operations (e.g., key missions, functions). Removal of executable programs is not always possible; therefore, establishing a method of preventing program execution is critical to maintaining a secure system baseline. Methods for complying with this requirement include restricting execution of programs in certain environments, while preventing execution in other environments; or limiting execution of certain program functionality based on organization-defined criteria (e.g., privileges, subnets, sandboxed environments, or roles). Satisfies: SRG-OS-000368-GPOS-00154, SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123, SRG-OS-000312-GPOS-00124, SRG-OS-000324-GPOS-00125, SRG-OS-000370-GPOS-00155
Check Content
Verify the operating system prevents program execution in accordance with local policies. Check that AppArmor is installed and active by running the following command, $ dpkg -l | grep apparmor If the "apparmor" package is not installed, this is a finding. $ systemctl is-active apparmor.service active If "active" is not returned, this is a finding. $ systemctl is-enabled apparmor.service enabled If "enabled" is not returned, this is a finding.
Fix Text
Install "AppArmor" (if it is not installed) with the following command: $ sudo apt-get install apparmor $ sudo systemctl enable apparmor.service Start "apparmor" with the following command: $ sudo systemctl start apparmor.service Note: AppArmor must have properly configured profiles for applications and home directories. All configurations will be based on the actual system setup and organization and normally are on a per role basis. See the AppArmor documentation for more information on configuring profiles.
Additional Identifiers
Rule ID: SV-238360r853435_rule
Vulnerability ID: V-238360
Group Title: SRG-OS-000368-GPOS-00154
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001764 |
The information system prevents program execution in accordance with organization-defined policies regarding software program usage and restrictions, and/or rules authorizing the terms and conditions of software program usage. |
CCI-001774 |
The organization employs a deny-all, permit-by-exception policy to allow the execution of authorized software programs on the information system. |
CCI-002165 |
The information system enforces organization-defined discretionary access control policies over defined subjects and objects. |
CCI-002235 |
The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. |