Author: Dave Farquhar

What to do if you can’t scan your whole network

Dave Farquhar security
What to do if you can’t scan your whole network

A former colleague contacted me some time ago with an interesting conundrum. I thought his problem in the solution would be worth sharing, because it’s not at all uncommon. He manages a network of, let’s say, 22,000 computers. But he has licenses to scan 8,800 of them. The question is, what can he do?

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What happened to Southwestern Bell

Dave Farquhar St. Louis
What happened to Southwestern Bell

What happened to Southwestern Bell? The once prominent name disappeared, but the company itself still exists.

Southwestern Bell didn’t go out of business, it’s just changed its name twice since 1995. In its current incarnation, it’s worth $229 billion.

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How to read a Nessus scan report

Dave Farquhar security
How to read a Nessus scan report

Reading and analyzing a Nessus vulnerability scanner report is an underrated skill. Frankly, I see a lot of misuse and abuse surrounding Nessus scans. So let’s talk about how to read and analyze a Nessus scan for the purpose of understanding and solving problems.

You can read it in the user interface but I recommend exporting a CSV so you can sort and filter. The exact CSV format has changed a bit over the years so they may not be in this exact order. But this will get you started. The most important columns are all here. You’ll find it very similar to reading a Qualys scan report.

For reference, I used the sample file here: https://github.com/derekmorr/nessus-csv/blob/master/nessus_test.csv

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Lockheed Martin Cyber Kill Chain explained

Dave Farquhar security
Lockheed Martin Cyber Kill Chain explained

The Lockheed Martin Cyber Kill Chain is a popular model in information security. The model illustrates the typical cyber attack. Like the CIA triad, the Cyber Kill Chain is a fundamental concept that helps people understand what motivates security professionals. Understanding it and being able to explain it makes us more effective at our jobs.

Here’s an explanation of the Cyber Kill Chain, along with a couple of examples, one real, and one imagined.

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What to do when you know a pedophile (and what not to)

Dave Farquhar Uncategorized

Word got out this weekend that a fairly prominent member of my profession is a pedophile. Fortunately I don’t know the guy. But this is hardly the first time this happened. A fairly prominent tech journalist turned out to be a pedophile a couple years ago too. Unfortunately this happens, and unfortunately I came into some experience in this area early in life.

I know from experience, you don’t always know until afterward. If it were easy to know, these people wouldn’t get away with it for so long.

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Vulnerabilities without CVE

Dave Farquhar security
Vulnerabilities without CVE

I had a discussion with somebody this week about vulnerabilities that don’t have CVEs. I learned from this conversation that there are a lot of misconceptions about those. So let’s talk about vulnerabilities without CVEs, and what to do about them.

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Why is lumber so expensive?

Dave Farquhar DIY
Why is lumber so expensive?

I remember when a 2×4 cost $3. And before you tell me I’m a grumpy old man, that was less sometime in 2019 or 2020. At the moment I’m writing this, a 2×4 costs $8. So what’s going on? Why is lumber so expensive? And will prices ever come back down to normal?

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Vulnerability management metrics

Dave Farquhar security
Vulnerability management metrics

I am 75% confident your vulnerability management metrics are too complicated. I’m 75% confident because I’d need to see examples from about twice as many organizations than I’ve seen in order to be 95% confident. But I’ve probably seen 150 more samples than most people. But I have bad news for you. I’m 75% confident your vulnerability management metrics are too simplistic. How can you be both? Measuring the wrong things puts you in situations like that. So let’s talk about NIST’s recommended vulnerability management metrics, and how to more closely align with their recommendations.

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How long it takes to get a security job with no experience

Dave Farquhar security
How long it takes to get a security job with no experience

I was involved in an interesting discussion about how long it takes to get a security job. But here’s an even more important question. How long does it take to get a security job with no experience? That’s a tougher question. I’ll also argue there’s no such thing as no experience. But to keep the search engines happy, here’s how long it takes to get a security job with no experience (except there’s no such thing as no experience!).

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Remove cigarette smell from books

Dave Farquhar Saving money
Remove cigarette smell from books

One of the best estate sales I ever attended was a sale in a modest St. Louis suburb that happened to be the estate of a computer programmer. The sale had almost everything I look for. Books, music, vintage computer gear, and even recent-ish computer gear. There was only one problem. Her books smelled like an ashtray. So I had to learn how to remove cigarette smell from books and other items.

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