SecurityFocus

Re: A new TCP/IP blind data injection technique? Dec 12 2003 12:41AM
Michal Zalewski (lcamtuf ghettot org) (2 replies)

Re: A new TCP/IP blind data injection technique? Dec 12 2003 05:32PM
Stephen Frost (sfrost snowman net)

Re: A new TCP/IP blind data injection technique? Dec 12 2003 05:14PM
Barney Wolff (barney databus com) (1 replies)

Re: A new TCP/IP blind data injection technique? Dec 12 2003 05:24PM
Michal Zalewski (lcamtuf ghettot org)

> I suspect that in these cases the RSTs may be coming from firewalls
> rather than end-hosts. It would be more impressive and surprising if
> one ever got a SYN-ACK in response.

Not really. A variant of the same test addressed to common ports such as
139 resulted in four SYN+ACKs coming back, compared to 50 SYN+ACKs when
the checksum was correct - which is roughly similar to the previous
figure. Quite surprisingly, some of this comes from what seems to be
Windows XP SP1 - but maybe an intermediate device rewrites the packet
instead.

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