Trusted Systems and Networks

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Time
5 hours 58 minutes
Difficulty
Intermediate
CEU/CPE
6
Video Transcription
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>> Welcome back to Cybrary ISSEP course,
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I'm your instructor, Brad Rhodes.
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We are going to now talk about trusted systems
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and networks in Domain 1 of ISSE.
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This lesson's going to briefly cover the TSN
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trusted systems network analysis methodology
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and then we're going to talk about why the heck
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do we do TSN?
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What does that mean as an SE and what should you know?
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The TSN analysis methodology is
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really focused on looking at
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commercial off-the-shelf technologies,
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and how they are integrated into
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government systems and so we do three things here.
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We do a criticality analysis,
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which is if I am going to rely solely on something that I
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procured a commercial off the shelf or from industry,
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I need to understand
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what is the consequence if that thing
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fails or the company goes out of
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business or something like that.
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Then we also look at threat
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assessments and vulnerability assessment.
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We're going to talk a lot
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more coming up about risk management,
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but this should be somewhat familiar when you see
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those risk assessment charts
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on the right-hand side of this chart.
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Then we have to do specific work looking at
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countermeasures and how they're
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tied to whether it's prevention,
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detection or response so those three types,
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remember those are important.
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Those three types of countermeasures and what we
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select to allow us to mitigate the risk.
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Just like anything, a risk management,
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and risk assessment methodology,
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which is what TSN analysis is we're going to take and do
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an initial risk assessment of if I did know
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mitigation and then I'm going to select countermeasures,
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do that mitigation and then recalculate
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my risk to see what my mitigated risk is that
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allows me to make a good decision whether or not using a
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commercial off the shelf piece of
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technology is valuable or not.
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Sometimes, as ISSEs,
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we have to go back to our bosses and tell them no,
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don't buy that thing even with countermeasures in place,
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it may be too risky to use.
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But let me give you a practical example.
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It is very possible, however,
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that we could purchase
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a system that's been online for years that uses
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old web technology that we've got to keep
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running because the solution set that's going
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to replace it isn't going to be built for years,
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were built for months and so when that happens,
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we then have to figure out what countermeasure
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is going to be put in place
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that allows us to keep working it.
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If I say like a web application,
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we can potentially employ something like
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a countermeasures such as a Web Application Firewall,
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a WAF to keep operating a system and so
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TSN analysis allows us to look at criticality,
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threats and vulnerabilities related
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to various commercial off-the-shelf systems,
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mitigate risk and then decide if it's worth
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it to actually utilize
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those capabilities or purchase those capabilities.
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Why TSN? Well, TSN really came out of the construct of
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the US Department of Defense when in
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the '90s and early 2000s we realized,
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or they realize that it's really hard to build
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complex systems at that sometimes it's much
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easier to go out and
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purchase those systems from industry.
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When we go out and buy commercial-off-the-shelf systems,
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whether we're in the government
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or wearing commercial industry,
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buying from a vendor, we need to do some work as ISSEs.
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We need to look at vulnerabilities.
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Remember those supply chain constraints we
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talked about, we got to look at those.
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Then when we need to determine can we actually
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mitigate the risk of using those technologies?
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Sometimes solutions are procured
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that stay in operation for 5,
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10, 15 years.
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Pretty typical to find that in
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the ICS SCADA side of the house
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especially in things like
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critical systems like power generation
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in water treatment, stuff like that.
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When you purchase something or make
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a major infrastructure upgrade,
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you're expecting that's going to run for years.
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Well, sometimes we do TSN after
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the fact because we have to keep those old systems
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operating long after they have become obsolete
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because the cost to replace them is
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so high that it doesn't make sense.
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It's much cheaper to mitigate the risk
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with appropriate countermeasures than it is to
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actually replace them and so TSN is applicable to
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both the acquisition side of the house and
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the operations and maintenance
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side of the house long-term,
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especially with systems that we keep on
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line years after they've achieved obsolescence.
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That's why we do TSN.
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In this video, we looked at the TSN analysis methodology.
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You need to remember criticality,
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vulnerability, threats, and then countermeasures.
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You're going to see that I promise you,
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as you go through your time as an ISSE or even on
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the ISSEP concentration materials
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themselves that you're going to see that.
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We talked about why we do TSN.
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We have to secure a commercial off-the-shelf systems
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that's the bulk
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of it and we secured
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those systems when we're buying them.
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We look at securing those systems after we bought them,
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and even potentially long after they become
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obsolete because it is
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expensive to replace those systems,
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especially if they're say, critical infrastructure.
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Will see you next time.
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