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RFC 6324
Title: Routing Loop Attack Using IPv6
Automatic Tunnels: Problem Statement and Proposed
Mitigations
Author: G. Nakibly, F. Templin
Status: Informational
Stream: IETF
Date: August 2011
Mailbox: gnakibly@yahoo.com,
fltemplin@acm.org
Pages: 19
Characters: 47385
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-v6ops-tunnel-loops-07.txt
URL: http://www.rfc-editor.org/rfc/rfc6324.txt
This document is concerned with security vulnerabilities in IPv6-in-
IPv4 automatic tunnels. These vulnerabilities allow an attacker to
take advantage of inconsistencies between the IPv4 routing state and
the IPv6 routing state. The attack forms a routing loop that can be
abused as a vehicle for traffic amplification to facilitate denial-
of-service (DoS) attacks. The first aim of this document is to
inform on this attack and its root causes. The second aim is to
present some possible mitigation measures. It should be noted that
at the time of this writing there are no known reports of malicious
attacks exploiting these vulnerabilities. Nonetheless, these
vulnerabilities can be activated by accidental misconfiguration.
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the IPv6 Operations Working Group of the IETF.
INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
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