A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : ANONsec: Anonymous IPsec to Defend Against Spoofing Attacks
Author(s) : J. Touch
Filename : draft-touch-anonsec-00.txt
Pages : 27
Date : 2004-5-6
Recent attacks on core Internet infrastructure indicate an increased
vulnerability of TCP connections to spurious resets (RSTs). TCP has
always been susceptible to such RST spoof attacks, which were
indirectly protected by checking that the RST sequence number was
inside the current receive window, as well as via the obfuscation of
TCP endpoint and port numbers. For pairs of well-known endpoints
often over predictable port pairs, such as BGP, increases in the path
bandwidth-delay product of a connection have sufficiently increased
the receive window space that off-path third parties can guess a
viable RST sequence number. This document addresses this
vulnerability, discussing proposed solutions at the transport level
and their inherent challenges, as well as existing network level
solutions and the feasibility of their deployment. Finally, it
proposes an extension to IPsec configuration called ANONsec that
intends to efficiently and scalably secure any transport protocol
from such off-path third-party spoofing attacks.
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