Re: Snort-1.9.0 not generating required alerts

[archana rao <archuatdavis () yahoo com>]

Thanks for the reply. The alert that I expect to be
generated has sid:981. It does look for the
"flow:to_server, established", but I am establishing a
session before sending the packets. I am doing tcpdump
of the traffic between my attacking machine and the
machine being attacked.I am writing the output of
tcpdump into a file and using this tcpdump formatted
file as input to Snort.These were the same steps that
I followed in Snort-1.8.7. Am I missing out
something?As I mentioned earlier, I am establishing a
session before firing the packets.
Archana


--- Erek Adams <erek () theadamsfamily net> wrote:
> On Mon, 14 Oct 2002, archana rao wrote:
>
> >    I had been using Snort-1.8.7 to detect the
> attacks
> > towards an IIS 4.0 server which uses the URI:
> > GET /scripts/..%c0%af../winnt/system32/cmd.exe/c+"
> >
> > and alerts were being generated by Snort-1.8.7.
> > However, when I used Snort-1.9.0 to detect the
> same
> > attacks, no alerts were being generated although I
> >  see from the source code that several
> improvements to
> > deal with attacks against IIS servers more
> efficiently
> >  have been made which should enable Snort-1.9.0 to
> > generate more alerts.I am not able to figure out
> what
> > the problem is.Any suggestions?
>
> First off, what alert do you expect to be generated?
>  What SID do you expect
> to see?  From a quick grep thru the rules, I'd guess
> you are epecting to see
> either 1065 or 1002.  One thing that has really
> changed in 1.9.0 is the
> addition of the 'flow' keyword.  Since both of those
> rules are looking for
> "flow:to_server,established", I'm going to guess
> that you're not establishing
> a session, you're just firing the packets.
>
> Do you have a packet capture of this?  Is it
> something that you can reproduce
> at will?
>
> Hope that helps!
>
> -----
> Erek Adams
> Nifty-Type-Guy
> TheAdamsFamily.Net
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