[Snort-sigs] Trouble with HTTP status message rule

Rodrigo Montoro(Sp0oKeR) spooker at ...2420...
Thu Mar 12 18:02:58 EDT 2015


Hi there,

Flow needs to be from_server since it's a server response.

Hope it helps!

On Thu, Mar 12, 2015 at 6:57 PM, Research <research at ...4016...>
wrote:

> Hello,
>
> I am currently writing a rather basic rule to track 404 resource not found
> instances in Snort on a web server.  While I am aware that the logs for the
> web server process themselves track this, I’d like to generate a Snort rule
> that does the same for some testing.
>
> Currently my rule is:
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS \
>          (msg: "Web resource not found";
> flow:established,to_server; content:"404"; http_stat_code; priority:4;
> sid:2000110; rev:001;)
>
> I have used the http_stat_code modifier for the content, but when I
> attempt to locate a non-existent resource:
>
> http://mywebserver.com/notthere
>
> …the rule does not fire.
>
> I was wondering what I am missing.
>
> Thanks
>
>
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-- 
Rodrigo Montoro (Sp0oKeR)
http://spookerlabs.blogspot.com
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