Re: Disable sid vs. Suppress

[Dave Venman <dvenman () sourcefire com>]

Most VRT rules I see with flowbits from the VRT which do the protocol/state
modelling have the "noalert" in the flowbit section, so there should be no
need either to modify the rule nor to add a suppression for it either.

Of course I'm more than welcome to be corrected . . .

On 22 September 2011 17:00, Jefferson, Shawn
<Shawn.Jefferson () bcferries com>wrote:

> Yes, but that entails changing the rule, doesn’t it? (could be wrong)  I’d
> rather not touch the rules as they come from VRT and ET, so I have been
> using suppression for these.****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* Dave Venman [mailto:dvenman () sourcefire com]
> *Sent:* Wednesday, September 21, 2011 9:25 PM
> *To:* Lay, James
> *Cc:* Jefferson, Shawn; snort-users () lists sourceforge net
> *Subject:* Re: [Snort-users] Disable sid vs. Suppress****
>
> ** **
>
> Rather than suppression, the "noalert" option in the flowbits portion of
> the rule can do that for you, i.e. it allows a rule which does detection
> purely to set a flowbit state (for example the flowbit client_hello in some
> of the ssl rules, which is used later when the SSL session being inspected
> is more advanced in its setup ) to *not* generate an event.****
>
> On 21 September 2011 20:39, Lay, James <james.lay () wincofoods com> wrote:**
> **
>
>
> From: Jefferson, Shawn [mailto:Shawn.Jefferson () bcferries com]
> Sent: Wednesday, September 21, 2011 11:34 AM
> To: Lay, James; snort-users () lists sourceforge net
> Subject: RE: Disable sid vs. Suppress****
>
>
> Some rules will set flowbits for others rules to fire on, so those ones
> will have to be suppressed instead of disabled (Pulled Pork nicely
> re-enables these flowbit setting rules for you.)
>
>
>
> ****
>
> Thanks Shawn...didn't know that :)****
>
>
> James

<cut>

-- 
Dave Venman, CISSP
Security Engineer Manager, Sourcefire EMEA
Email:   dave.venman () sourcefire com
Mobile: +44 (7917) 168068
DDI:     +44 (118) 989 8412
Fax:     +44 (118) 989 8401

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