Re: Flowbits config

[Joel Esler <jesler () sourcefire com>]

On Oct 22, 2013, at 7:36 AM, Peter Bates <peter.bates () ucl ac uk> wrote:

> Hello all
>
> On 22/10/2013 11:42, Anshuman Anil Deshmukh wrote:
> > WARNING: 'ignore_any_rules' option for Stream5 UDP disabled because of UDP rule with flow or flowbits option.
> >
> > ICMP tracking disabled, no ICMP sessions allocated
> >
> > IP tracking disabled, no IP sessions allocated
> >
> > WARNING: flowbits key 'ET.BotccIP' is set but not ever checked.
> >
> > WARNING: flowbits key 'ET.RBN' is set but not ever checked.
>
> These are just warnings - Snort will run.
>
> They just mean (as the warning says) that a rule has defined
> a flowbit but it is never tested by another rule.
>
> For example, SID 28214 "EXPLOIT-KIT Neutrino exploit kit outbound request format"
> includes
> flowbits:set,file.exploit_kit.jar
>
> SID 27816 "EXPLOIT-KIT Multiple exploit kit jar file download attempt" 
> checks with
> flowbits:isset,file.exploit_kit.jar
>
> It's a way of maintaining state in checking rules.
>
> The best advice is to use Pulledpork for flowbit resolution.

Peter is 100%, however, from your dump I noticed a few in the default shipping policy that should have been corrected.  
I fixed these and will ship in an upcoming rule pack.

--
Joel Esler
AEGIS Intelligence Lead
OpenSource Community Manager
Vulnerability Research Team, Sourcefire

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