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Subject: Re: [cti-stix] [cti] [cti-stix] MISP Taxonomies [Was: CTI Brussels F2F Meeting...RSVP deadline 5 September]


I also think we should call out in the specification how you would map this to the Admiralty score.  This way, for people that want to do it, they all do it the same way.


Thanks,

Bret



Bret Jordan CISSP
Director of Security Architecture and Standards | Office of the CTO
Blue Coat Systems
PGP Fingerprint: 63B4 FC53 680A 6B7D 1447  F2C0 74F8 ACAE 7415 0050
"Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg." 

On Sep 13, 2016, at 13:09, Jordan, Bret <bret.jordan@BLUECOAT.COM> wrote:

As I just said in my last email, I think for things like this we just pre-define them in normative text. If you have a 1-5 scale, this is what it looks like, if you have a 1-3 scale, this is how it works.


Thanks,

Bret



Bret Jordan CISSP
Director of Security Architecture and Standards | Office of the CTO
Blue Coat Systems
PGP Fingerprint: 63B4 FC53 680A 6B7D 1447  F2C0 74F8 ACAE 7415 0050
"Without cryptography vihv vivc ce xhrnrw, however, the only thing that can not be unscrambled is an egg." 

On Sep 13, 2016, at 06:34, Wunder, John A. <jwunder@mitre.org> wrote:

The wider scale certainly seems like the path of least resistance. Tools get to do what they want and for the most part things should just work. A couple worries (perhaps edge cases?) I would have:

1. The admiralty scale has specific semantics for each level that tools not using it would of course not honor. So someone who set a confidence of “high” in ToolA, which maps to 100 (let’s say), would get translated to a 1 in the admiralty scale when displayed by ToolB. But was it actually confirmed by other sources?
2. There would potentially be issues where people map scales over differently. I.e. (None, Low, Medium, High) would have a different range than (Low, Medium, High) and so a score of “Low” in ToolC might translate to “None” in ToolD and confuse people. Then you have to explain to the user that “well, in reality it’s a 1-100 scale underneath and the products use different scales and……”

I’m not totally opposed btw, just wanted to point out some of these issues.

John

On 9/13/16, 7:42 AM, "cti-stix@lists.oasis-open.org on behalf of Alexandre Dulaunoy" <cti-stix@lists.oasis-open.org on behalf of Alexandre.Dulaunoy@circl.lu> wrote:

   On 13/09/16 12:31, Jason Keirstead wrote:
Yes, exactly.

The purpose of the larger range is simply to accommodate more possible scales than a single 1-5 scale. Nothing more or less.

   Indeed. The proposal came from some real cases we had like reorganizing the confidence level of various sources. The 1-5 scale is clearly
   for human analysts where the whole range is mainly for machine-to-machine. With the current proposal[2], you can have both.

   Compared to the existing confidence level in STIX described with the HighMediumLowVocab-1.0[1], we added a scale
   and a clear description for analysts.

   [1] http://stixproject.github.io/data-model/1.2/stixVocabs/HighMediumLowVocab-1.0/
   [2] https://github.com/MISP/misp-taxonomies/blob/master/misp/machinetag.json#L31

   --
   Alexandre Dulaunoy
   CIRCL - Computer Incident Response Center Luxembourg
   41, avenue de la gare L-1611 Luxembourg
   info@circl.lu - www.circl.lu

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