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[Acme] [Technical Errata Reported] RFC8555 (6843)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 08 February 2022 20:23 UTC

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Subject: [Acme] [Technical Errata Reported] RFC8555 (6843)
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The following errata report has been submitted for RFC8555,
"Automatic Certificate Management Environment (ACME)".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid6843

--------------------------------------
Type: Technical
Reported by: James Kasten <jdkasten@umich.edu>

Section: 8.3

Original Text
-------------
Because many web servers
allocate a default HTTPS virtual host to a particular low-privilege
tenant user in a subtle and non-intuitive manner, the challenge must
be completed over HTTP, not HTTPS.


Corrected Text
--------------
Because many web servers
allocate a default HTTPS virtual host to a particular low-privilege
tenant user in a subtle and non-intuitive manner, the challenge must
be initiated over HTTP, not HTTPS.

Notes
-----
Completing the entire http-01 challenge over HTTP is unnecessary. The threat of default HTTPS virtual hosts is remediated by "initiating" the http-01 challenge over HTTP. Validation servers which redirect from HTTP to HTTPS should be permitted following the rest of the guidance within Section 10, Security Considerations.

Instructions:
-------------
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--------------------------------------
RFC8555 (draft-ietf-acme-acme-18)
--------------------------------------
Title               : Automatic Certificate Management Environment (ACME)
Publication Date    : March 2019
Author(s)           : R. Barnes, J. Hoffman-Andrews, D. McCarney, J. Kasten
Category            : PROPOSED STANDARD
Source              : Automated Certificate Management Environment
Area                : Security
Stream              : IETF
Verifying Party     : IESG

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