[cabfpub] [EXTERNAL] Ballot 221: Two-Factor Authentication and Password Improvements

Bruce Morton Bruce.Morton at entrustdatacard.com
Thu Mar 29 21:43:41 UTC 2018


As this ballot may require a CA to make a technical change or change a procedure, should we state a future effective date to allow CAs to ensure they are compliant?


From: Public [mailto:public-bounces at cabforum.org] On Behalf Of Tim Hollebeek via Public
Sent: March 28, 2018 3:26 PM
To: CA/Browser Forum Public Discussion List <public at cabforum.org>
Subject: [EXTERNAL][cabfpub] Ballot 221: Two-Factor Authentication and Password Improvements

Ballot 221: Two-Factor Authentication and Password Improvements

Purpose of Ballot: The Network Security Working Group met a number of times to
improve the Network Security Guidelines requirements around authentication,
specifically by requiring two-factor authentication, and improving the password
requirements in line with more recent NIST guidelines.

While CAs are encouraged to improve their password requirements as soon as
possible, a two year grace period is being given to allow organizations to
develop and implement policies to implement the improved requirements, especially
since some organizations may have to simultaneously comply with other
compliance frameworks that have not been updated yet and are based on older NIST
guidance about passwords.

The following motion has been proposed by Tim Hollebeek of DigiCert and endorsed
by Dimitris Zacharopoulos of Harica and Neil Dunbar of TrustCor.


This ballot modifies the "Network and Certificate System Security Requirements"
as follows, based upon Version 1.1:

In the definitions, add a definition for Multifactor Authentication:

"Multi-Factor Authentication: An authentication mechanism consisting of two or
more of the following independent categories of credentials (i.e. factors) to
verify the user's identity for a login or other transaction: something you know
(knowledge factor), something you have (possession factor), and something you
are (inherence factor).  Each factor must be independent.  Certificate-based
authentication can be used as part of Multifactor Authentication only if the
private key is stored in a Secure Key Storage Device."

Add a definition for Secure Key Storage Device:

"Secure Key Storage Device: A device certified as meeting at least FIPS 140-2
level 2 overall, level 3 physical, or Common Criteria (EAL 4+)."

In section 1.j., capitalize Multi-Factor Authentication, and strike the
parenthetical reference to subsection 2.n.(ii).

In section 2.f., add "(for accountability purposes, group accounts or shared
role credentials SHALL NOT be used)" after "authenticate to Certificate Systems".

Change section 2.g. to read:

"g. If an authentication control used by a Trusted Role is a username and password,
    then, where technically feasible, implement the following controls:
  i.           For accounts that are accessible only within Secure Zones or High Security
               Zones, require that passwords have at least twelve (12) characters;
  ii.          For accounts that are accessible from outside a Secure Zone or High Security
               Zone, require Multi-Factor Authentication, with passwords that have at least
               eight (8) characters and are not be one of the user's previous four (4)
               passwords; and implement account lockout for failed access attempts in
               accordance with subsection k;
  iii.        When developing password policies, CAs SHOULD take into account the password
               guidance in NIST 800-63B Appendix A.
  iv.         If passwords are required to be changed periodically, that period SHOULD be
               at least two years.  Effective April 1, 2020, if passwords are required to
               be changed periodically, that period SHALL be at least two years."

In section 2.h., change "Require" to "Have a policy that requires"

In section 2.i., change "Configure" to "Have a procedure to configure"

Change section 2.k. to read:

"k. Lockout account access to Certificate Systems after no more than five (5) failed access attempts, provided that this security measure:
  i.           is supported by the Certificate System,
  ii.          Cannot be leveraged for a denial of service attack, and
  iii.        does not weaken the security of this authentication control;"

Change section 2.n. to read:

"Enforce Multi-Factor Authentication for all Trusted Role accounts on Certificate
Systems (including those approving the issuance of a Certificate, which equally
applies to Delegated Third Parties) that are accessible from outside a Secure Zone
or High Security Zone; and"


The procedure for approval of this ballot is as follows:

Discussion (7+ days)

Start Time: 2018-03-28  15:30:00 EDT

End Time: after 2018-04-04 15:30:00 EDT

Vote for approval (7 days)

Start Time: TBD

End Time: TBD
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