[Full-disclosure] Crafted SYN Packets...
nocfed at gmail.com
Wed Nov 14 01:27:20 GMT 2007
Google for ephemeral port tcp syn
On Nov 13, 2007 5:43 PM, Dean Pierce <piercede at pdx.edu> wrote:
> Simon Smith wrote:
> > Kelly,
> > SYN packets and ports do not correlate. And yes, SYN is TCP. You
> > read up on TCP/IP etc so that you understand protocols before posting to
> > mailing lists.
> Maybe then you could explain how it works :-) From what I understand,
> the RFC doesn't really specify how source ports should be generated for
> new TCP sessions (Please someone correct me if I'm wrong, I am not
> intimately familiar with that particular set of RFCs).
> On my linux system I have currently have access to, the numbers I am
> getting seem pretty random (59101, 49607, 40343, 54786, 38335, ...)
> while the windows xp machine I am on seems to be rather sequential
> (12050, 12065, 10293, ...).
> Also, google claims that source ports have been used to identify worms
> etc where the source ports have been hard coded into the packet engine.
> Hopefully someone more familiar with the field responds :-)
> - DEAN
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