Information Security Professional

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“Information Security Officer related Frequently Asked Questions in various Information Security Professional job interviews by interviewer. The set of questions here ensures that you offer a perfect answer posed to you. So get preparation for your new job hunting”



95 Information Security Professional Questions And Answers

61⟩ Tell me what does it mean for a machine to have an “air gap”? Why are air gapped machines important?

An air gapped machine is simply one that cannot connect to any outside agents. From the highest level being the internet, to the lowest being an intranet or even bluetooth.

Air gapped machines are isolated from other computers, and are important for storing sensitive data or carrying out critical tasks that should be immune from outside interference. For example, a nuclear power plant should be operated from computers that are behind a full air gap. For the most part, real world air gapped computers are usually connected to some form of intranet in order to make data transfer and process execution easier. However, every connection increases the risk that outside actors will be able to penetrate the system.

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63⟩ Explain how exactly does traceroute/tracert work at the protocol level?

This is a fairly technical question but it’s an important concept to understand. It’s not natively a “security” question really, but it shows you whether or not they like to understand how things work, which is crucial for an Infosec professional. If they get it right you can lighten up and offer extra credit for the difference between Linux and Windows versions.

The key point people usually miss is that each packet that’s sent out doesn’t go to a different place. Many people think that it first sends a packet to the first hop, gets a time. Then it sends a packet to the second hop, gets a time, and keeps going until it gets done. That’s incorrect. It actually keeps sending packets to the final destination; the only change is the TTL that’s used. The extra credit is the fact that Windows uses ICMP by default while Linux uses UDP.

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64⟩ Explain what’s the goal of information security within an organization?

This is a big one. What I look for is one of two approaches; the first is the über-lockdown approach, i.e. “To control access to information as much as possible, sir!” While admirable, this again shows a bit of immaturity. Not really in a bad way, just not quite what I’m looking for. A much better answer in my view is something along the lines of, “To help the organization succeed.”

This type of response shows that the individual understands that business is there to make money, and that we are there to help them do that. It is this sort of perspective that I think represents the highest level of security understanding—-a realization that security is there for the company and not the other way around.

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65⟩ Do you know what’s the difference between Symmetric and Asymmetric encryption?

To boil down an extremely complicated topic into a few short words, Symmetric encryption uses the same key to encrypt and decrypt, while Asymmetric uses different keys for encryption and decryption. Symmetric is usually much faster, but is difficult to implement most times due to the fact that you would have to transfer the key over an unencrypted channel. Therefore many times an Asymmetric connection will be established first, then send creates the Symmetric connection. This leads us into the next topic…

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66⟩ Do you know what is the difference between an HIDS and a NIDS?

Both acronyms are Intrusion Detection Systems, however the first is a Host Intrusion Detection System whereas the second is a Network Intrusion Detection System. An HIDS runs as a background utility in the same as an anti-virus program for instance, while a Network Intrusion Detection System sniffs packets as they go across the network looking for things that aren’t quite ordinary. Both systems have two basic variants: signature based and anomaly based. Signature based is very much like an anti-virus system, looking for known values of known ‘bad things’, while anomaly looks more for network traffic that doesn’t fit the usual pattern of the network. This requires a bit more time to get a good baseline, but in the long term can be better on the uptake for custom attacks.

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67⟩ Tell me are open-source projects more or less secure than proprietary ones?

The answer to this question is often very telling about a given candidate. It shows 1) whether or not they know what they’re talking about in terms of development, and 2) it really illustrates the maturity of the individual (a common theme among my questions). My main goal here is to get them to show me pros and cons for each. If I just get the “many eyes” regurgitation then I’ll know he’s read Slashdot and not much else. And if I just get the “people in China can put anything in the kernel” routine then I’ll know he’s not so good at looking at the complete picture.

The ideal answer involves the size of the project, how many developers are working on it (and what their backgrounds are), and most importantly — quality control. In short, there’s no way to tell the quality of a project simply by knowing that it’s either open-source or proprietary. There are many examples of horribly insecure applications that came from both camps.

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68⟩ Tell me what is Cross-Site Request Forgery?

Not knowing this is more forgivable than not knowing what XSS is, but only for junior positions. Desired answer: when an attacker gets a victim’s browser to make requests, ideally with their credentials included, without their knowing. A solid example of this is when an IMG tag points to a URL associated with an action, e.g. http://foo.com/logout/. A victim just loading that page could potentially get logged out from foo.com, and their browser would have made the action, not them (since browsers load all IMG tags automatically).

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69⟩ Tell me what is a pentest?

“Pentest” is short for “penetration test”, and involves having a trusted security expert attack a system for the purpose of discovering, and repairing, security vulnerabilities before malicious attackers can exploit them. This is a critical procedure for securing a system, as the alternative method for discovering vulnerabilities is to wait for unknown agents to exploit them. By this time it is, of course, too late to do anything about them.

In order to keep a system secure, it is advisable to conduct a pentest on a regular basis, especially when new technology is added to the stack, or vulnerabilities are exposed in your current stack.

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70⟩ What is certified Firewall Analyst?

It declares that the individual has proficiency in skills and abilities to design, monitor and configure routers, firewalls and perimeter defense systems

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71⟩ Tell me what’s the difference between a threat, vulnerability, and a risk?

As weak as the CISSP is as a security certification it does teach some good concepts. Knowing basics like risk, vulnerability, threat, exposure, etc. (and being able to differentiate them) is important for a security professional. Ask as many of these as you’d like, but keep in mind that there are a few differing schools on this. Just look for solid answers that are self-consistent.

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72⟩ Explain what do you think of social networking sites such as Facebook and LinkedIn?

This is a doozy, and there are an enormous number of opinions for this question. Many think they are the worst thing that ever happened to the world, while others praise their existence. In the realm of security, they can be the source of extreme data leaks if handled in their default configurations. It is possible to lock down permissions on social networking sites, but in some cases this isn’t enough due to the fact that the backend is not sufficiently secured. This also doesn’t help if somebody else’s profile that you have on your list gets compromised. Keeping important data away from these kinds of sites is a top priority, and only connecting with those you trust is also extremely helpful.

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73⟩ Suppose what is the difference between a vulnerability and an exploit?

A lot of people would say that they are the same thing, and in a sense they would be right. However, one is a potential problem while the other is an active problem. Think of it like this: You have a shed with a broken lock where it won’t latch properly. In some areas such as major cities, that would be a major problem that needs to be resolved immediately, while in others like rural areas its more of a nuisance that can be fixed when you get around to it. In both scenarios it would be a vulnerability, while the major cities shed would be an example of an exploit – there are people in the area, actively exploiting a known problem.

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74⟩ Explain what is SSL and why is it not enough when it comes to encryption?

SSL is identity verification, not hard data encryption. It is designed to be able to prove that the person you are talking to on the other end is who they say they are. SSL and its big brother TLS are both used almost everyone online, but the problem is because of this it is a huge target and is mainly attacked via its implementation (The Heartbleed bug for example) and its known methodology. As a result, SSL can be stripped in certain circumstances, so additional protections for data-in-transit and data-at-rest are very good ideas.

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75⟩ Tell me what are Linux’s strengths and weaknesses vs. Windows?

Look for biases. Does he absolutely hate Windows and refuse to work with it? This is a sign of an immature hobbyist who will cause you problems in the future. Is he a Windows fanboy who hates Linux with a passion? If so just thank him for his time and show him out. Linux is everywhere in the security world.

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76⟩ Tell us where do you get your security news from?

Here I’m looking to see how in tune they are with the security community. Answers I’m looking for include things like Team Cymru, Reddit, Twitter, etc. The exact sources don’t really matter. What does matter is that he doesn’t respond with, “I go to the CNET website.”, or, “I wait until someone tells me about events.”. It’s these types of answers that will tell you he’s likely not on top of things.

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77⟩ Tell me what are your daily news checks?

It seems like we can’t go more than a few days anymore without hearing about a major breach, which on the surface would make it seem that more people and places are being hacked than ever before (which to be honest is true). However, it also shows that detection and reporting of attacks is improving per requirements of both government entities and insurance companies. As a result, the public and security professionals are both better informed as to what they can do to help protect themselves and watch out for falsified charges on their accounts. Keeping up to date on these matters is vital for anyone interested in Information Security.

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78⟩ Explain how would you judge if a remote server is running IIS or Apache?

Error messages oftentimes giveaway what the server is running, and many times if the website administrator has not set up custom error pages for every site, it can give it away as simply as just entering a known bad address. Other times, just using telnet can be enough to see how it responds. Never underestimate the amount of information that can be gained by not getting the right answer but by asking the right questions.

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79⟩ Tell me how would you find out what a POST code means?

POST is one of the best tools available when a system will not boot. Normally through the use of either display LEDs in more modern systems, or traditionally through audio tones, these specific codes can tell you what the system doesn’t like about its current setup. Because of how rare these events can be, unless you are on a tech bench day in and day out, reference materials such as the Motherboard manual and your search engine of choice can be tremendous assets. Just remember to make sure that everything is seated correctly, you have at least the minimum required components to boot, and most importantly that you have all of your connections on the correct pins.

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