[cabfpub] Recourse for domain owners who discover unknown certificates issued to their domain
Kirk.Hall at entrust.com
Tue Oct 11 18:22:39 MST 2016
WebTrust for CAs has this general statement: “The Certification Authority must disclose its key and certificate life cycle management business and information privacy practices” and Requirement 6.6 on Certificate Revocation says “The CA maintains controls to provide reasonable assurance that certificates are revoked, based on authorized and validated certificate revocation requests within the time frame in accordance with the CA’s disclosed business practices.“
4.9.2. Who Can Request Revocation
The Subscriber, RA, or Issuing CA can initiate revocation. Additionally, Subscribers, Relying Parties,
Application Software Suppliers, and other third parties may submit Certificate Problem Reports informing the
issuing CA of reasonable cause to revoke the certificate.
4.9.3. Procedure for Revocation Request
The CA SHALL provide a process for Subscribers to request revocation of their own Certificates. The process
MUST be described in the CA’s Certificate Policy or Certification Practice Statement. The CA SHALL maintain a
continuous 24x7 ability to accept and respond to revocation requests and related inquiries.
The CA SHALL provide Subscribers, Relying Parties, Application Software Suppliers, and other third parties with
clear instructions for reporting suspected Private Key Compromise, Certificate misuse, or other types of fraud,
compromise, misuse, inappropriate conduct, or any other matter related to Certificates. The CA SHALL publicly
disclose the instructions through a readily accessible online means.
4.9.4. Revocation Request Grace Period
4.9.5. Time within which CA Must Process the Revocation Request
The CA SHALL begin investigation of a Certificate Problem Report within twenty-four hours of receipt, and decide
whether revocation or other appropriate action is warranted based on at least the following criteria:
1. The nature of the alleged problem;
2. The number of Certificate Problem Reports received about a particular Certificate or Subscriber;
3. The entity making the complaint (for example, a complaint from a law enforcement official that a Web site is
engaged in illegal activities should carry more weight than a complaint from a consumer alleging that she didn’t
receive the goods she ordered); and
4. Relevant legislation.
From: Public [mailto:public-bounces at cabforum.org] On Behalf Of Peter Bowen via Public
Sent: Monday, October 10, 2016 8:35 PM
To: Rick Andrews <Rick_Andrews at symantec.com>
Cc: public at cabforum.org
Subject: Re: [cabfpub] Recourse for domain owners who discover unknown certificates issued to their domain
> On Oct 10, 2016, at 5:31 PM, public at cabforum.org<mailto:public at cabforum.org> wrote:
> During the discussions about CT name redaction (, ), it became
> clear that there is no formal policy regarding what actions a CA
> should take if a domain owner approached the CA to get information
> about a certificate issued by the CA for a domain owned by the domain
> owner. We'd like to start a discussion to craft such a policy. Note
> that this is not specific to name redaction. A domain owner might
> discover a non-redacted certificate in a CT log or public web crawl,
> and if the owner doesn't recognize the certificate, they should be
> able to get detailed information from the CA so that the domain owner
> can determine if the cert was properly issued, and request revocation if it was not.
Before we discuss how we authenticate the domain registrant, I think need to discuss what a CA must do when so asked by a domain registrant.
As a straw man, I’m going to suggest that an authenticated domain registrant can do the following:
- Require revocation of a certificate containing a FQDN or Wildcard DN under their registered domain by providing the CA the issuer DN and serial number of the certificate
- Require revocation of all certificates containing a FQDN or Wildcard DN under their registered domain or a portion of the namespace under their registered domain
- Authorize the issuance of certificates containing a FQDN or Wildcard DN under their registered domain
- Require the CA to only allow certain named people or email addresses to authorize future issuance
The registrant cannot:
- Require the CA to provide a list of all certificates containing a FQDN or Wildcard DN under their registered domain
- Require the CA to provide details on the applicant/subscriber for a certificate containing a FQDN or Wildcard DN under their registered domain
- Require the CA to provide an unredacted version of a redacted certificate containing a FQDN or Wildcard DN under their registered domain
To come up with this list, I considered the situation where domain foo.example is registered to Alice (potentially using a proxy as the registrant). Mallory is a nefarious individual and wants to bring harm to Alice or Alice’s organization. Mallory manages to take over foo.example (either due to Alice letting it expire or via domain transfer fraud) and then proceeds to contact CAs to get info about foo.example and Alice. What should a CA be required to release?
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