[Emerging-Sigs] Eleonore Drive By's and the Redirection To Them

Joel Esler jesler at sourcefire.com
Tue Oct 5 15:11:23 EDT 2010


I haven't used the http_cookie keyword, but since it's a normalized buffer,
I assume it would be similar to http_uri, where you can't do relative
statements to a normalized buffer.

J

On Tue, Oct 5, 2010 at 3:06 PM, evilghost at packetmail.net <
evilghost at packetmail.net> wrote:

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>
> On 10/05/2010 02:03 PM, Eoin Miller wrote:
> > We have had some weird issues with doing multiple content matches in the
> > same buffer (by that I mean it does not alert as you would expect it
> > to). I haven't tested this with 2.9.0 yet, but the 2.8.6.x's would not
> > alert if you added http_cookie to the second content match (if my memory
> > serves). We could use  distance:N; but since we are content matching on
> > just cookie values containing the first content in only the cookie
> > field, I would guess the performance increase would be negligible.
>
> I would love to hear more about this and will try to confirm on my end.
>  I wonder if the below would mitigate the issue?  Basically constrain
> both to the same normalized buffer and make it be relative to the
> previous while keep the pointer in the same buffer.
>
> content:"SL_"; http_cookie; content:"_0000="; http_cookie; distance:0;
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