[Servercert-wg] Discussion Period Begins - Ballot SC-067 V1: "Require domain validation and CAA checks to be performed from multiple Network Perspectives”

Tue Mar 19 05:19:21 UTC 2024

Hi Chris 

Could there be a numbering clash with this ballot and the one being worked on by Ben Wilson? 

“[Servercert-wg] Draft Ballot SC-067: Applicant, Subscriber and Subscriber Agreements - Feedback r”

As I am not completely sure how ballot numbering should work out, can the numbers be recycled or how that pans out? 

//Antti 

From: Servercert-wg <servercert-wg-bounces at cabforum.org> on behalf of Chris Clements via Servercert-wg <servercert-wg at cabforum.org>
Date: Monday, 18. March 2024 at 17.32
To: CA/B Forum Server Certificate WG Public Discussion List <servercert-wg at cabforum.org>
Subject: [Servercert-wg] Discussion Period Begins - Ballot SC-067 V1: "Require domain validation and CAA checks to be performed from multiple Network Perspectives” 

Purpose of Ballot SC-067: 

This Ballot proposes updates to the Baseline Requirements for the Issuance and Management of Publicly-Trusted TLS Server Certificates (i.e., TLS BRs) related to “Multi-Perspective Issuance Corroboration” (“MPIC”). 

Background: 

- MPIC refers to performing domain validation and CAA checks from multiple Network Perspectives before certificate issuance, as described within the Ballot for the applicable validation methods in TLS BR Sections 3.2.2.4 and 3.2.2.5. 
- Not all methods described in TLS BR Sections 3.2.2.4 and 3.2.2.5 will require using MPIC. 
- This work was most recently motivated by research presented at Face-to-Face 58 [1] by Princeton University, but has been discussed for years prior as well. 
- The goal of this proposal is to make it more difficult for adversaries to successfully launch equally-specific prefix attacks against the domain validation processes described in the TLS BRs. 
- Additional background information can be found in an update shared at Face-to-Face 60 [2]. 

Benefits of Adoption: 

- Recent publicly-documented attacks have used BGP hijacks to fool domain control validation and obtain malicious certificates, which led to the impersonation of HTTPS websites [3][4]. 
- Routing security defenses (e.g., RPKI) can mitigate the risk of global BGP attacks, but localized, equally-specific BGP attacks still pose a significant threat to the Web PKI [5][6]. 
- Corroborating domain control validation checks from multiple network perspectives (i.e., MPIC) spread across the Internet substantially reduces the threat posed by equally-specific BGP attacks, ensuring the integrity of domain validation and issuance decisions [5][7][8]. 
- Existing deployments of MPIC at the scale of millions of certificates a day demonstrate the feasibility of this technique at Internet scale [7][9]. 

Intellectual Property (IP) Disclosure: 

- While not a Server Certificate Working Group Member, researchers from Princeton University presented at Face-to-Face 58, provided academic expertise, and highlighted publicly-available peer-reviewed research to support Members in drafting this ballot. 
- The Princeton University researchers indicate that they have not filed for any patents relating to their MPIC work and do not plan to do so in the future. 
- Princeton University has indicated that it is unable to agree to the CA/Browser Forum IPR agreement because it could encumber inventions invented by researchers not involved in the development of MPIC or with the CA/B Forum. 
- Princeton University has instead provided the attached IPR statement. Pursuant to the IPR statement, Princeton University has granted a worldwide royalty free license to the intellectual property in MPIC developed by the researchers and has made representations regarding its lack of knowledge of any other Princeton intellectual property needed to implement MPIC. 
- For clarity, Princeton University’s IPR statement is NOT intended to replace the Forum’s IPR agreement or allow Princeton to participate in the Forum in any capacity. 
- Members seeking legal advice regarding this ballot should consult their own counsel. 

Proposal Revision History: 

- Pre-Ballot Release #1 (work team artifacts and broader Validation Subcommittee collaboration) [10] 
- Pre-Ballot Release #2 [11] 

Previous versions of this Ballot: 

- N/A, this is the first discussion period. 

References: 
[1] https://cabforum.org/wp-content/uploads/13-CAB-Forum-face-to-face-multiple-vantage-points.pdf <https://cabforum.org/wp-content/uploads/13-CAB-Forum-face-to-face-multiple-vantage-points.pdf> 
[2] https://drive.google.com/file/d/1LTwtAwHXcSaPVSsqKQztNJrV2ozHJ7ZL/view?usp=drive_link <https://drive.google.com/file/d/1LTwtAwHXcSaPVSsqKQztNJrV2ozHJ7ZL/view?usp=drive_link> 
[3] https://medium.com/s2wblog/post-mortem-of-klayswap-incident-through-bgp-hijacking-en-3ed7e33de600 <https://medium.com/s2wblog/post-mortem-of-klayswap-incident-through-bgp-hijacking-en-3ed7e33de600> 
[4] https://www.coinbase.com/blog/celer-bridge-incident-analysis <https://www.coinbase.com/blog/celer-bridge-incident-analysis> 
[5] https://www.usenix.org/conference/usenixsecurity23/presentation/cimaszewski <https://www.usenix.org/conference/usenixsecurity23/presentation/cimaszewski> 
[6] https://www.blackhat.com/docs/us-15/materials/us-15-Gavrichenkov-Breaking-HTTPS-With-BGP-Hijacking-wp.pdf <https://www.blackhat.com/docs/us-15/materials/us-15-Gavrichenkov-Breaking-HTTPS-With-BGP-Hijacking-wp.pdf> 
[7] https://www.usenix.org/conference/usenixsecurity21/presentation/birge-lee <https://www.usenix.org/conference/usenixsecurity21/presentation/birge-lee> 
[8] https://www.usenix.org/conference/usenixsecurity18/presentation/birge-lee <https://www.usenix.org/conference/usenixsecurity18/presentation/birge-lee> 
[9] https://security.googleblog.com/2023/05/google-trust-services-acme-api_0503894189.html <https://security.googleblog.com/2023/05/google-trust-services-acme-api_0503894189.html> 
[10] https://github.com/ryancdickson/staging/pull/6 <https://github.com/ryancdickson/staging/pull/6> 
[11] https://github.com/ryancdickson/staging/pull/8 <https://github.com/ryancdickson/staging/pull/8> 

The following motion has been proposed by Chris Clements and Ryan Dickson of Google (Chrome Root Program) and endorsed by Aaron Gable (ISRG / Let’s Encrypt) and Wayne Thayer (Fastly). 

— Motion Begins — 

This ballot modifies the “Baseline Requirements for the Issuance and Management of Publicly-Trusted TLS Server Certificates” (“Baseline Requirements”), based on Version 2.0.2. 

MODIFY the Baseline Requirements as specified in the following Redline: 
https://github.com/cabforum/servercert/compare/41f01640748fa612386f8b1a3031cd1bff3d4f35..6d10abda8980c6eb941987d3fc26e753e62858c0 <https://github.com/cabforum/servercert/compare/41f01640748fa612386f8b1a3031cd1bff3d4f35..6d10abda8980c6eb941987d3fc26e753e62858c0> 

— Motion Ends — 

This ballot proposes a Final Maintenance Guideline. The procedure for approval of this ballot is as follows: 

Discussion (at least 21 days) 
- Start: 2024-03-18 15:30:00 UTC 
- End no earlier than: 2024-04-07 15:30:00 UTC 

Vote for approval (7 days) 
- Start: TBD 
- End: TBD 

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