Extended Security Considerations for the Automatic Certificate Management Environment (ESecACME)
draft-fiebig-security-acme-00

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Last updated 2019-01-11
Replaces draft-fiebig-acme-esecacme
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Security Dispatch                                              T. Fiebig
Internet-Draft                                                  TU Delft
Intended status: Informational                               K. Borgolte
Expires: July 15, 2019                              Princeton University
                                                        January 11, 2019

     Extended Security Considerations for the Automatic Certificate
                   Management Environment (ESecACME)
                     draft-fiebig-security-acme-00

Abstract

   Most Public Key Infrastructure X.509 (PKIX) certificates are issued
   via the ACME protocol.  Recently, several attacks against domain
   validation (DV) have been published, including IP-use-after-free and
   (forced) on-path attacks.  These attacks can often be mitigated by
   (selectively) requiring additional challenges, such as DNS
   validation, proof of ownership of a prior certificate, and by being
   more diligent in operating a certificate authority.  This document
   provides a list of currently known attacks and describes mitigations
   and operational procedures to prevent issuing a certificate to an
   unauthorized party.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on July 15, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Fiebig & Borgolte         Expires July 15, 2019                 [Page 1]
Internet-Draft                  ESecACME                    January 2019

   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  IP and Resource-use-after-free Attacks  . . . . . . . . .   3
       2.1.1.  Detection . . . . . . . . . . . . . . . . . . . . . .   4
       2.1.2.  Defense . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  (Forced)-On-path Attacks  . . . . . . . . . . . . . . . .   4
       2.2.1.  Detection . . . . . . . . . . . . . . . . . . . . . .   5
       2.2.2.  Defense . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  DNS Cache Poisoning Attacks . . . . . . . . . . . . . . .   5
       2.3.1.  Detection . . . . . . . . . . . . . . . . . . . . . .   5
       2.3.2.  Defense . . . . . . . . . . . . . . . . . . . . . . .   6
     2.4.  DNS Cache Staleness Attacks . . . . . . . . . . . . . . .   6
       2.4.1.  Detection . . . . . . . . . . . . . . . . . . . . . .   6
       2.4.2.  Defense . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Summary of CA Operational Improvements  . . . . . . . . . . .   6
     3.1.  Hardening Against Attacks Without DNS Control . . . . . .   7
     3.2.  Multi-Vantage Point Validation  . . . . . . . . . . . . .   7
     3.3.  BGP Monitoring  . . . . . . . . . . . . . . . . . . . . .   7
     3.4.  DNS Resolver Configuration and Monitoring . . . . . . . .   7
     3.5.  DNSSEC Validation Failure and Lack of DNSSEC  . . . . . .   8
     3.6.  Recent Domain Transfer  . . . . . . . . . . . . . . . . .   8
   4.  Additional Validation Options . . . . . . . . . . . . . . . .   8
     4.1.  Proof of Ownership of a Prior Certificate . . . . . . . .   8
       4.1.1.  Limitations . . . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10
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