Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery (RFC6980)
Original Publication Date: 2013-Aug-01
Included in the Prior Art Database: 2013-Aug-14
Internet Society Requests For Comment (RFCs)
The Neighbor Discovery Protocol (NDP) is specified in RFC 4861 [RFC4861]. It is used by both hosts and routers. Its functions include Neighbor Discovery (ND), Router Discovery (RD), address autoconfiguration, address resolution, Neighbor Unreachability Detection (NUD), Duplicate Address Detection (DAD), and redirection.
Internet Engineering Task Force (IETF) F. Gont Request for Comments: 6980 SI6 Networks / UTN-FRH Updates: 3971, 4861 August 2013 Category: Standards Track ISSN: 2070-1721
Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery
This document analyzes the security implications of employing IPv6 fragmentation with Neighbor Discovery (ND) messages. It updates RFC 4861 such that use of the IPv6 Fragmentation Header is forbidden in all Neighbor Discovery messages, thus allowing for simple and effective countermeasures for Neighbor Discovery attacks. Finally, it discusses the security implications of using IPv6 fragmentation with SEcure Neighbor Discovery (SEND) and formally updates RFC 3971 to provide advice regarding how the aforementioned security implications can be mitigated.
Status of This Memo
This is an Internet Standards Track document.
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). Further information on Internet Standards is available in 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/rfc6980.
Gont Standards Track [Page 1]
RFC 6980 ND and IPv6 Fragmentation August 2013
Copyright (c) 2013 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 ....................................................2 2. Traditional Neighbor Discovery and IPv6 Fragmentation ...........4 3. SEcure Neighbor Discovery (SEND) and IPv6 Fragmentation .........5 4. Rationale for Forbidding IPv6 Fragmentation in Neighbor Discovery .......................................................6 ...