The Ubuntu operating system must implement certificate status checking for multifactor authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75907	UBTU-16-030820	SV-90587r2_rule		Medium

Description
Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Requires further clarification from NIST. Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162

Description

Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device. Multifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card. A privileged account is defined as an information system account with authorizations of a privileged user. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. This requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management). Requires further clarification from NIST. Satisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162

STIG	Date
Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide	2018-07-18

Details

Check Text ( C-75595r2_chk )
Verify the Ubuntu operating system implements certificate status checking for multifactor authentication. Check that certificate status checking for multifactor authentication is implemented with the following command: # sudo grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf \| grep ocsp_on cert_policy = ca,signature,ocsp_on; If "cert_policy" is not set to "ocsp_on", has a value of "none", or the line is commented out, this is a finding.

Check Text ( C-75595r2_chk )

Verify the Ubuntu operating system implements certificate status checking for multifactor authentication.

Check that certificate status checking for multifactor authentication is implemented with the following command:

# sudo grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf | grep ocsp_on

cert_policy = ca,signature,ocsp_on;

If "cert_policy" is not set to "ocsp_on", has a value of "none", or the line is commented out, this is a finding.

Fix Text (F-82537r2_fix)
Configure the Ubuntu operating system to certificate status checking for multifactor authentication. Modify all of the cert_policy lines in "/etc/pam_pkcs11/pam_pkcs11.conf" to include "ocsp_on".