Deprecating RC4 in Secure Shell (SSH)
draft-ietf-curdle-rc4-die-die-die-16

Document Type Active Internet-Draft (curdle WG)
Last updated 2019-09-30 (latest revision 2019-07-31)
Replaces draft-luis140219-curdle-rc4-die-die-die
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Internet Engineering Task Force                                L. Camara
Internet-Draft
Updates: 4253 (if approved)                                L. Velvindron
Intended status: Best Current Practice                     cyberstorm.mu
Expires: January 31, 2020                                  July 30, 2019

                 Deprecating RC4 in Secure Shell (SSH)
                  draft-ietf-curdle-rc4-die-die-die-16

Abstract

   This document deprecates RC4 in Secure Shell (SSH).  Therefore, this
   document formally moves to Historic RFC4345.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 31, 2020.

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

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Updates to RFC 4253 . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The usage of RC4 suites ( also designated as arcfour ) for SSH are
   specified in [RFC4253] and [RFC4345].  [RFC4253] specifies the
   allocation of the "arcfour" cipher for SSH.  [RFC4345] specifies and
   allocates the "arcfour-128" and "arcfour-256" ciphers for SSH.  RC4
   encryption has known weaknesses [RFC7465] [RFC8429], and the
   deprecation process should be begun for their use in Secure Shell
   (SSH) [RFC4253].  Accordingly, [RFC4253] is updated to note the
   deprecation of the RC4 ciphers and [RFC4345] is moved to Historic as
   all ciphers it specifies MUST NOT be used.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119]RFC
   8174 [RFC8174] when, and only when, they appear in all capitals, as
   shown here.

2.  Updates to RFC 4253

   [RFC4253] is updated to prohibit arcfour's use in SSH.  [RFC4253]
   allocates the "arcfour" cipher in Section 6.3 by defining a list of
   defined ciphers where the "arcfour" cipher appears as optional as
   mentioned below:

   +---------------+-----------------+---------------------------------+
   | arcfour       | OPTIONAL        | the ARCFOUR stream cipher with  |
   |               |                 | a 128-bit key                   |
   +---------------+-----------------+---------------------------------+

   The current document updates the status of the "arcfour" ciphers in
   the list of [RFC4253] Section 6.3 by moving it from OPTIONAL to MUST
   NOT.

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   +----------+-----------+--------------------------------------------+
   | arcfour  | MUST NOT  | the ARCFOUR stream cipher with a 128-bit   |
   |          |           | key                                        |
   +----------+-----------+--------------------------------------------+

   [RFC4253] defines the "arcfour" ciphers with the text mentioned
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