full-disclosure - Re: Risk measurements

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Date: Fri, 12 Feb 2010 07:31:23 -0500
From: Valdis.Kletnieks@...edu
To: Christian Sciberras <uuf6429@...il.com>
Cc: "McGhee, Eddie" <Eddie.McGhee@....com>,
	craig.wright@...ormation-defense.com,
	full-disclosure <full-disclosure@...ts.grok.org.uk>,
	security-basics@...urityfocus.com,
	"Thor \(Hammer of God\)" <Thor@...merofgod.com>
Subject: Re: Risk measurements

On Fri, 12 Feb 2010 13:09:55 +0100, Christian Sciberras said:

> There's a time for finding fancy interesting numbers and a time to get
> the system going with the least flaws possible.

You don't want "the least flaws possible".  We can get very close to zero
flaws per thousand lines of code - but the result ends up costing hundreds
of dollars per line.  You want "the most economical number of flaws" - if
you get it down to 10 flaws, and the next flaw will cost you $750,000 to fix,
but you estimate your loss as $500,000 if you don't fix it and get hacked,
why are you spending $250,000 extra to fix the flaw?

> Why should any entity bother with risk modeling if it is not used at all?
> Here's the real question to the subject; What does risk modeling fix?

Risk modeling is what tells you the flaw will cost $500K to not fix.
And since you totally screw the pooch if you got it wrong and not fixing
it costs $1M, people like to do a good job of risk modelling.

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