Analysis of Residual Threats and Possible Fixes for Multipath TCP (MPTCP)
RFC 7430

Document Type RFC - Informational (July 2015; Errata)
Last updated 2015-12-14
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IESG IESG state RFC 7430 (Informational)
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Internet Engineering Task Force (IETF)                        M. Bagnulo
Request for Comments: 7430                                          UC3M
Category: Informational                                        C. Paasch
ISSN: 2070-1721                                                UCLouvain
                                                                 F. Gont
                                                  SI6 Networks / UTN-FRH
                                                          O. Bonaventure
                                                               UCLouvain
                                                               C. Raiciu
                                                                     UPB
                                                               July 2015

          Analysis of Residual Threats and Possible Fixes for
                         Multipath TCP (MPTCP)

Abstract

   This document analyzes the residual threats for Multipath TCP (MPTCP)
   and explores possible solutions to address them.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7430.

Bagnulo, et al.               Informational                     [Page 1]
RFC 7430                 MPTCP Residual Threats                July 2015

Copyright Notice

   Copyright (c) 2015 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
   (http://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.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  ADD_ADDR Attack . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Possible Security Enhancements to Prevent This Attack . .  10
   3.  DoS Attack on MP_JOIN . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Possible Security Enhancements to Prevent This Attack . .  12
   4.  SYN Flooding Amplification  . . . . . . . . . . . . . . . . .  12
     4.1.  Possible Security Enhancements to Prevent This Attack . .  13
   5.  Eavesdropper in the Initial Handshake . . . . . . . . . . . .  13
     5.1.  Possible Security Enhancements to Prevent This Attack . .  14
   6.  SYN/JOIN Attack . . . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  Possible Security Enhancements to Prevent This Attack . .  14
   7.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  MPTCP Security Improvements for a Standards Track
           Specification . . . . . . . . . . . . . . . . . . . . . .  15
     7.2.  Security Enhancements for MPTCP . . . . . . . . . . . . .  16
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

Bagnulo, et al.               Informational                     [Page 2]
RFC 7430                 MPTCP Residual Threats                July 2015

1.  Introduction

   This document provides a complement to the threat analysis for
   Multipath TCP (MPTCP) [RFC6824] documented in RFC 6181 [RFC6181].
   RFC 6181 provided a threat analysis for the general solution space of
   extending TCP to operate with multiple IP addresses per connection.
   Its main goal was to leverage previous experience acquired during the
   design of other multi-address protocols, notably Shim6 [RFC5533], the
   Stream Control Transmission Protocol (SCTP) [RFC4960], and Mobile
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