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ISO-27000 « The InfoSec Blog
The InfoSec Blog

The Truth About Best Practices

Posted by Anton Aylward

An article on Linked entitled 'The Truth about Practices" started a discussion thread with some of my colleagues.

The most pertinent comment came from Alan Rocker:

I'm not sure whether to quote "Up the Organisation", ("If you must have a
policy manual, reprint the Ten Commandments"),  or "Catch-22" (about the
nice "tidy bomb pattern" that unfortunately failed to hit the target), in
support of the article.

Industry-wide metrics can nevertheless be useful, though it's fatal to
confuse a speedometer and a motor.

However not everyone in the group agreed with our skepticism and the observations of the author of the article.
One asked

And Anton aren't the controls you advocate so passionately best practices? >

NOT. Make that *N*O*T*!*!*!  Even allowing for the lowercase!

"Best practices" is an advertising line of self-aggrandization invented by the Big Name Accounting Firms when operating in Consulting Mode.Information Security SWOT Analysis

Confusion over Physical Assets, Information Assets in ISO-27000

Posted by Anton Aylward

I often explain that Information Security focuses on Information Assets.

Some day, on the corporate balance sheet, there will be an entry
which reads, "Information"; for in most cases the information is
more valuable  than the hardware which processes it.
   -- Adm. Grace Murray Hopper, USN Ret.

Some people see this as a binary absolute - they think that there's no need to asses the risks to the physical assets or that somehow this is automatically considered when assessing the risk to information.

The thing is there are differing types of information and differing types of containers for them.

Does ISO 27001 compliance need a data leakage prevention policy?

Posted by Anton Aylward

On one of the ISO-27000 lists I subscribe to I commented that one should have a policy to determine the need for and the criteria for choosing a Data Loss Prevention mechanism.

The DLP Logo

I get criticised occasionally for long and detailed posts that some readers complain treat them like beginners, but sadly if I don't I get comments such as this in reply

  Data Loss is something you prevent; you enforce controls to prevent data
  leakage, DLP can be a programme, but , I find very difficult to support
  with a policy.

Does one have visions of chasing escaping data over the net with a three-ring binder labelled "Policy"?

Let me try again.

Fly Away

Policy comes first.
Without policy giving direction, purpose and justification, supplying the basis for measurement, quality and applicability (never mind issues such as configuration) then you are working on an ad-hoc basis.

What is the goal behind calculating assets in ISO-27000?

Posted by Anton Aylward

My friend and colleague Gary Hinson said about asset valuation in ISO-27000

So, for instance, it’s hard to say exactly how much the HR database
is worth, but it’s a fair bet that it is less valuable to the
organization than the Sales and Marketing database containing
commercial details on customers and prospects. Therefore, it
probably makes commercial sense to put more effort and resources into
securing the S&M database against disclosure incidents, than for the
HR database.

While Gary is 'classically' right, there's a hidden gotcha in all that.

It is *YOU* that are assigning value, it is the value to YOU.
As Donn Parker points out, this may be quite different from the the value system of the attackers. You don't know their values, motivations, tools etc etc etc.

Help on ISO-27000 SoA

Posted by Anton Aylward

This kind of question keeps coming up, many people are unclear about the Statement of Applicability on ISO-27000.
The  SoA should outline the measures to be taken in order to reduce risks such as those mentioned in Annex A of the standard. These are based on 'Controls'.

But if you are using closed-source products such as those from Microsoft, are you giving up control?  Things like validation checks and integrity controls are are 'internal'.

Well, its a bit of a word-play.

  • SoA contains exclusions on controls that are not applicable because the organization doesn't deal with these problems (ie ecommerce)
  •  SoA contains exclusions on controls that pose a threat (and risks arise) but cannot be helped (ie A.12.2 Correct processing in applications) and no measures can be taken to reduce these risks.

With this, a record must be present in risk assessments, stating that the risk (even if it is above minimum accepted risk level) is accepted

IBM CIO Report: Key Findings

The key to the SOA is SCOPE.