Title

The Apparmor module must be configured to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs and limit the ability of non-privileged users to grant other users direct access to the contents of their home directories/folders. (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).

Check Content

Verify that the Ubuntu operating system is configured to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs and access to user home directories. Check that "Apparmor" is configured to employ application whitelisting and home directory access control with the following command: # sudo apparmor_status apparmor module is loaded. 17 profiles are loaded. 17 profiles are in enforce mode. /sbin/dhclient /usr/bin/lxc-start ... 0 processes are in complain mode. 0 processes are unconfined but have a profile defined. If the defined profiles do not match the organization's list of authorized software, this is a finding.

Fix Text

Configure the Ubuntu operating system to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs. Install "Apparmor" (if it is not installed) with the following command: # sudo apt-get install apparmor Enable "Apparmor" (if it is not already active) with the following command: # 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-219324r853392_rule

Vulnerability ID: V-219324

Group Title: SRG-OS-000370-GPOS-00155

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.