A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.
Title : Defending TCP Against Spoofing Attacks
Author(s) : J. Touch
Filename : draft-ietf-tcpm-tcp-antispoof-00.txt
Pages : 19
Date : 2005-2-14
Recent analysis of potential attacks on core Internet infrastructure
indicates 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 or
between web servers and well-known large-scale caches, 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.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-tcpm-tcp-antispoof-00.txt
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