Unfortunate History of Transient Numeric Identifiers
draft-irtf-pearg-numeric-ids-history-07

Document Type Active Internet-Draft (pearg RG)
Authors Fernando Gont  , Ivan Arce 
Last updated 2021-02-10 (latest revision 2021-02-02)
Replaces draft-gont-numeric-ids-history
Stream IRTF
Intended RFC status Informational
Formats plain text pdf htmlized (tools) htmlized bibtex
Stream IRTF state Waiting for IRTF Chair
Consensus Boilerplate Unknown
Document shepherd Sara Dickinson
Shepherd write-up Show (last changed 2021-01-20)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to sara@sinodun.com
Internet Research Task Force (IRTF)                              F. Gont
Internet-Draft                                              SI6 Networks
Intended status: Informational                                   I. Arce
Expires: August 6, 2021                                        Quarkslab
                                                        February 2, 2021

          Unfortunate History of Transient Numeric Identifiers
                draft-irtf-pearg-numeric-ids-history-07

Abstract

   This document analyzes the timeline of the specification and
   implementation of different types of "transient numeric identifiers"
   used in IETF protocols, and how the security and privacy properties
   of such protocols have been affected as a result of it.  It provides
   empirical evidence that advice in this area is warranted.  This
   document is a product of the Privacy Enhancement and Assessment
   Research Group (PEARG) in the IRTF.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 6, 2021.

Copyright Notice

   Copyright (c) 2021 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Gont & Arce              Expires August 6, 2021                 [Page 1]
Internet-Draft           Predictable Numeric IDs           February 2021

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Threat Model  . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Issues with the Specification of Transient Numeric
       Identifiers . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IPv4/IPv6 Identification  . . . . . . . . . . . . . . . . . .   5
   6.  TCP Initial Sequence Numbers (ISNs) . . . . . . . . . . . . .   9
   7.  IPv6 Interface Identifiers (IIDs) . . . . . . . . . . . . . .  11
   8.  NTP Reference IDs (REFIDs)  . . . . . . . . . . . . . . . . .  14
   9.  Transport Protocol Ephemeral Port Numbers . . . . . . . . . .  14
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     13.2.  Informative References . . . . . . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  28

1.  Introduction

   Networking protocols employ a variety of transient numeric
   identifiers for different protocol objects, such as IPv4 and IPv6
   Fragment Identifiers [RFC0791] [RFC8200], IPv6 Interface Identifiers
   (IIDs) [RFC4291], transport protocol ephemeral port numbers
   [RFC6056], TCP Initial Sequence Numbers (ISNs) [RFC0793], and DNS
   Transaction IDs (TxIDs) [RFC1035].  These identifiers typically have
   specific interoperability requirements (e.g. uniqueness during a
   specified period of time), and associated failure severities when
   such requirements are not met
   [I-D.irtf-pearg-numeric-ids-generation].

   For more than 30 years, a large number of implementations of the TCP/
   IP protocol suite have been subject to a variety of attacks, with
   effects ranging from Denial of Service (DoS) or data injection, to
   information leakages that could be exploited for pervasive monitoring
   [RFC7258].  The root cause of these issues has been, in many cases,
   poor selection of transient numeric identifiers, usually as a result
   of insufficient or misleading specifications.

   For example, implementations have been subject to security or privacy
   issues resulting from:

   o  Predictable IPv4 or IPv6 Fragment Identifiers (see e.g.
      [Sanfilippo1998a], [RFC6274], and [RFC7739])

Gont & Arce              Expires August 6, 2021                 [Page 2]
Internet-Draft           Predictable Numeric IDs           February 2021
Show full document text