Re: Snort and matching window size?

[James Lay <slave_tothe_box () yahoo com>]

On Mon, 30 Jun 2003 11:23:01 -0400
"Matt Kettler" <mkettler () evi-inc com> wrote:

> At 07:21 AM 6/30/2003 -0600, James Lay wrote:
> > alert tcp $EXTERNAL_NET any -> $HOME_NET 6588 (msg:"AnalogX Proxy Server 
> > Scan"; flags:S;)
> >
> > as my rule, but I'd like to know if there's a way to match the window 
> > size.  I tried matchine it with a content matching keyword, but that 
> > didn't work.  Does the content keyword match just the data portion of the 
> > packet?  Or does it content match against headers as well?  Thanks all!
> >
> > James
>
> Content matches the data only.
>
> There is however an option to check the tcp window size directly, although 
> it's not in the formal documentation...
>
>
> Quoting Brian <bmc () snort org> from the snort-sigs list on 6/12/03:
>
> > Snort has support for checking the window size.  It has been an
> > undocumented feature for the last 2 years.
> >
> >    window:[!]<window_size>;

JUST what the doctor ordered...I'm hoping the data is givin in decimal and not hex...but I'll try both.  Any other 
undocumented features out there?  Thanks!

James



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