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-02.txt
Pages : 25
Date : 2005-10-10
Recent analysis of potential attacks on core Internet infrastructure
indicates an increased vulnerability of TCP connections to spurious
resets (RSTs), sent with forged IP source addresses (spoofing). TCP
has always been susceptible to such RST spoofing 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. The susceptibility to attack increases as the square
of the bandwidth, thus presents a significant vulnerability for
recent high-speed networks. 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. This document
focuses on vulnerabilities due to spoofed TCP segments, and includes
a discussion of related ICMP spoofing attacks on TCP connections.
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