Vulnerability Discussion

Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security functions are defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.

This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.

Check

Per OPORD 16-0080, the endpoint security tool system is Endpoint Security for Linux (ENSL) in conjunction with SELinux.

Verify the operating system verifies correct operation of all security functions.

Check if "SELinux" is active and is enforcing the targeted policy with the following command:

# sestatus

SELinux status: enabled

SELinuxfs mount: /selinux

SELinux root directory: /etc/selinux

Loaded policy name: targeted

Current mode: enforcing

Mode from config file: enforcing

Policy MLS status: enabled

Policy deny_unknown status: allowed

Max kernel policy version: 28

If the "Loaded policy name" is not set to "targeted", this is a finding.

Verify that the /etc/selinux/config file is configured to the "SELINUXTYPE" to "targeted":

# grep -i "selinuxtype" /etc/selinux/config | grep -v '^#'

SELINUXTYPE = targeted

If no results are returned or "SELINUXTYPE" is not set to "targeted", this is a finding.

Fix

Configure the operating system to verify correct operation of all security functions.

Set the "SELinuxtype" to the "targeted" policy by modifying the "/etc/selinux/config" file to have the following line:

SELINUXTYPE=targeted

A reboot is required for the changes to take effect.