Re: Rules with options like http_uri of flow

[rmkml <rmkml () yahoo fr>]

Hi Onno,

Could you check when disable cksum verification please ? (-k none)

Regards
@Rmkml



On Tue, 17 Dec 2013, onno () b00z nl wrote:

> Hi,
>
> I've some, at least for me, weird behaviour with snort rules. I already
> reinstalled every thing 3 times, but still haven't it to work.
> The sensor is passive and connected to a switch monitor port. I'm testing
> the setup for monitoring both in- and outbound traffic, so I configured
> both HOME_NET and EXTERNAL_NET with any.
>
> While I was testing, I discovered that I was unable to fire some rules. So
> I created the following test rules:
>
> This one is working when requesting an URL like http://<hostname>/blaat.txt
> alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"WEBSERVER -
> test rule blaat.txt"; content:"GET /blaat.txt"; nocase; metadata:ruleset
> community, service http; classtype:web-application-attack; sid:1002;
> rev:18;)
>
> This rule is derived from an existing one. But the modified existing one
> has also the following options:
> flow:to_server,established; and/or http_uri;
> But as soon as I add one of those options, the rule won't fire. And
> because of that I think that there might be something wrong with my setup
> and that it won't hit on other rules also.
>
> This is an example of a rule that won't fire:
> alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"WEBSERVER -
> test rule blaat.txt"; flow:to_server,established; content:"GET
> /blaat.txt"; nocase; metadata:ruleset community, service http;
> classtype:web-application-attack; sid:1002; rev:18;)
>
> Even without the flow option and with http_uri, it does not work.
>
> Any insight would be great.
> Thanks!
> Onno.


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