Application level IDS?

[Smokey Lonesome <smokey_ids () yahoo com>]

Hi IDS experts,

        I'm not deeply familiar with IDS technologies and
products, so I apologize in advance if this is a
too-trivial question:
        
        Is there anything like an "application level IDS" ?
(similar to what is now called "application
firewall"?)
        
        What I mean is something that has the non-intrusive
characteritics of an IDS (as it was discussed lately
regarding Gartner's article - I'm talking about I_D_S
and not I_P_S) but which is doing deep application
level analysis, maybe even application-session
(cookies?) related analysis (though i'm not sure it is
possible to keep track of a session when you're just
monitoring traffic).
        I think such a system should be able to detect the
many application level attacks - SQL injections,
hidden-fields tampering, cookie poisoning etc. while
being more sensitive than a firewall\IPS considering
it is not blocking any traffic upon detecting
"suspicious" activity.

        Does something like that exist? Has any of you
implemented it? Can it be implemented using any of the
existing IDS's (maybe on top of Snort's stream4?
Someone mentioned in a recent post "build POP3
protocol intelligence" - how can this be done with
existing tools? can it be done for HTTP\HTML as well?)
        
        TIA,    
        (-) Smokey.
------
"You can't have everything. Where would you put it?"
(Steven Wright)


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