Host Scanning in IPv6 Networks
draft-gont-opsec-ipv6-host-scanning-00

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Document Type Active Internet-Draft (individual)
Last updated 2012-04-19
Replaced by RFC 7707, RFC 7707
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Operational Security Capabilities for                            F. Gont
IP Network Infrastructure (opsec)                                UK CPNI
Internet-Draft                                            April 20, 2012
Intended status: Informational
Expires: October 22, 2012

                     Host Scanning in IPv6 Networks
                 draft-gont-opsec-ipv6-host-scanning-00

Abstract

   IPv6 offers a much larger address space than that of its IPv4
   counterpart.  The standard /64 IPv6 subnets can (in theory)
   accommodate approximately 1.844 * 10^19 hosts, thus resulting in a
   much lower host density (#hosts/#addresses) than their IPv4
   counterparts.  As a result, it is widely assumed that it would take a
   tremendous effort to perform host scanning attacks against IPv6
   networks, and therefore IPv6 host scanning attacks have long been
   considered unfeasible.  This document analyzes the IPv6 address
   configuration policies implemented in most popular IPv6 stacks, and
   identifies a number of patterns in the resulting addresses lead to a
   tremendous reduction in the host address search space, thus
   dismantling the myth that IPv6 host scanning attacks are unfeasible.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on October 22, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://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.  Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Address configuration in IPv6  . . . . . . . . . . . . . . . .  5
     3.1.  StateLess Address Auto-Configuration (SLAAC) . . . . . . .  5
       3.1.1.  Interface-Identifiers embedding IEEE Identifiers . . .  5
       3.1.2.  Privacy Addresses  . . . . . . . . . . . . . . . . . .  7
       3.1.3.  Stable and random Interface Identifiers  . . . . . . .  7
     3.2.  Dynamic Host Configuration Protocol version 6 (DHCPv6) . .  8
     3.3.  Manually-configured addresses  . . . . . . . . . . . . . .  8
   4.  IPv6 address assignment in real-world network scenarios  . . . 10
   5.  Previous work in the area of IPv6 host scanning  . . . . . . . 12
     5.1.  IPv6 host scanning of remote networks  . . . . . . . . . . 12
   6.  Mitigations  . . . . . . . . . . . . . . . . . . . . . . . . . 13
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 16
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 16
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 18

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1.  Disclaimer

   This document is a "stripped down" version of a document we have
   authored on IPv6 host scanning.  This version is ssentially meant to
   provide some numbers as to how feasible IPv6 host scanning attacks
   are.  Future revisions will cover the topic more thoroughly.

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2.  Introduction
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