How to secure your corporate VPN Infrastructure during the COVID-19 epidemic?

This post was originaly posted to my LinkedIn profile here, in cooperation with Auxilium Cyber Security.

COVID-19 still affects our everyday life, with companies being one of the weakest links in the chain. Employees get filled with uncertainty for their future which seriously affects people’s judgment and habits.

In our last post, we discussed phishing and how COVID-19 affected people’s judgment when it comes to emails and malicious links. But people’s judgment is not always the weakest link. Some of the vital parts of working from home may be affected by misconfiguration issues or even bad choices of products and one of these parts is Virtual Private Networks used to connect employees securely with the company’s assets. We, in Auxilium Cyber Security, have years of experience in VPN architecture, setup, configuration, and security and we wanted to share our best tips on how to keep your VPN infrastructure secure during COVID-19 days and not.

VPNs are not new technology. People all over the world use VPNs for privacy concerns, censorship and malicious acts amongst others. But now that almost all employees work from home, VPNs seem mandatory and for a good reason. They can create a direct connection from one place another (e.g. from the employee’s laptop to the company’s private network) which will encrypt the communication, so MITM attacks, data leaks from network tampering and other attacks like these can be avoided.

But as with our phishing related issues, VPN choices and set-up can result in serious security implications. Our experience in secure implementations of VPN infrastructures and testing makes us believe that many companies have misconfiguration issues, because of the complexity of such systems and the overload of different options. To strengthen the security of a VPN infrastructure, Auxilium Cyber Security suggests the following moves:

  1. Keep your products up to date. As discussed in our last post, many entry points for malicious users are achieved by exploiting outdated client, or even server, applications. Users will need to follow strict policies when working from home, and one of them must definitely be to update their VPN client application that they use to connect to the corporate network.
  2. Use multi-factor authentication. Multi-factor authentication like SMS codes and hardware keys are usually ignored as they present additional complexity for novice users. But novice users usually use weak passwords or even keep their passwords in unsecure places. This means that a single employee with a weak password can be the way in for an attacker to your corporate network, and even in cases of strong passwords, ignorant and uneducated employees can be easily phished for an easy way into the network. Presenting MFA, can strengthen the VPN implementation and move part of the liability to the company, instead of employees.
  3. Implement scheduled testing. VPN software and services are one of the most targeted technologies currently by malicious users, as more and more people use them every day. This means that updates and security research in this field runs with the speed of light, and proper security testing has to be scheduled. Auxilium Cyber Security has years of experience in secure network architecture and testing of VPN implementations, which can help your company design, implement and test your VPN if it is your first time with this technology or even if you want to comply with current security standards.
  4. Prevent DDoS attacks on your VPN server. Many denial of service attacks can target your VPN server. DoS attacks can result in limited availability or no service at all, and possibly serious implications for many users and positions inside the company, if the network is down. This means that this is a serious issue, and it has to be treated delicately. In order to prevent those issues, a suitable and well crafted DDoS policy has to be implemented which will be the result of real-time visibility and proper tuning of the server. Different devices have to be monitored efficiently and session timeouts have to be implemented according to the requirements of the network.

VPN security is mostly a company’s issue with many critical options to be taken. The most popular and widespread implementations are highly customizable, which opens a huge conversation about security, privacy and cryptography, something that can really mess up a VPN implementation. Leaving unrelated to IT employees aside, companies and IT departments are also in need of proper education, especially in times of crisis, where security implications become more and more common.

It may seem huge, alongside all the other issues that surfaced with the pandemic, but with those simple steps, a company can remain secure and be more sure about the mandatory measures that most of us are obliged to follow for the common good. We hope that these tips will help most of us stay secure, but for the ones that are uncertain about it, we strongly believe that our experience can benefit you. For VPN architecture, design, implementation, security testing, and others, feel free to contact us. Stay safe, stay home, stay secure.

Thomas Sermpinis for Auxilium Cyber Security

How to secure your corporate ICT during the COVID-19 epidemic?

This post was originaly posted to my LinkedIn profile here, in cooperation with Auxilium Cyber Security.

With novel coronavirus cases on the rise, people get filled with fear and uncertainty. This seriously impacts all the aspects of our everyday life, and as a result, that of our working life.

Auxilium Cyber Security has a long experience with simulated phishing campaigns, testing the readiness of its clients at regular intervals, which resulted in a good understanding, and a good amount of data, to support the understanding of the human factor in the cybersecurity aspect of a company.

Watching the huge increase of Covid-19 related malicious emails, targeting individuals and companies, it seemed like a necessity to run Covid-19 related tests and see how this situation can affect employee’s readiness and reflexes.

The results were surprising. With an average of less than 5% of users marked as phish-prone on the last, unrelated to Covid-19 tests, now the percentage skyrocketed to almost half of its users, which is a huge topic of discussion that every company using web technologies and online communication, has to consider. This is an expected outcome, which derives from the current world crisis, but supporting data and this kind of results help us better understand the situation in deep and have a clear and detailed view of what policies we need to apply and the additional steps that companies have to follow.

Previously discussed topics about phishing apply to the current situation too, but the following simple steps can help any company lower its phish-prone stats, and be more secure.

  1. Keep your employees updated. The human factor is the most vulnerable part of your infrastructure. Even with the most updated systems, the strongest security policies and security tests all over the place, a single employee that is not well educated can create a huge security issue. And because of the effect that crisis periods have on employee judgment, like the one that we are experiencing right now, companies have to update their education policies and adapt to the needs of each crisis.
  2. Update your stats. Running scheduled simulated phishing campaigns can help companies have a better understanding of how their staff performs on a frequent basis and understand the impact that a crisis situation can have. Auxilium Cyber Security with years of experience in simulated phishing campaigns and social engineering can help you perform this kind of tests and interpret the results in real-world impact on each company and its assets.
  3. Educate your employees regarding each scenario. Even if employees are updated and secure, crisis situations may affect them in ways that no one can imagine. This is why education has to be adapted to each situation, and companies need to act fast, in order to lower the impact of unexpected factors. Auxilium Cyber Security has years of experience in employee security education, which is customized in each customer’s needs and assets, which is based on years of tests and statistics.

It is common for companies to ignore cybersecurity when other factors can impact a company’s existence, but there may be a huge economic impact if they do not get used to act proactively and plan for the risk management. We have seen until now that the biggest effect that Covid-19 had to companies, was for them to change their way of working to “work from home”. Many companies were not ready for this either, with many of them struggling to find a way to communicate, connect to their networks, access files securely, etc.

Looking at the big picture, and covering the topic of securely working from home at a high level, some simple tips that every company can follow are the following:

  1. Use encrypted channels of communication and VPN connections. Working from home companies lose control of the network that their employees are connected to. In such cases, the first thing that has to be established is that employees use encrypted channels of communication, in order to avoid adversaries trying to steal information in not well-secured networks, like a home or shared one.
  2. Implement a web filtering policy. Devices used specifically for company reasons, have to be restricted in what they can browse and what they can do, in cases of work from home situations. This can be achieved with a mandatory VPN connection to the company that will filter the connections and restrict malicious and unwanted traffic.
  3. Encrypt work devices. Devices that are meant for work, like laptops and smartphones, can easily land in the hands of malicious users, when employees work from home for long periods of time. Having a drive encryption policy (even the default OS one, like FileVault for MacOS and BitLocker for Windows) can help a company secure its assets, and avoid pointless data leaks.
  4. Use a secure and shared cloud storage. Sharing files remotely becomes mandatory when working from home. This means that a secure cloud solution has to be used in order to share files fast and efficiently. When searching for your next cloud solution consider SSL encryption in the cloud provider’s website as a must, file encryption capabilities for private documents and a highly editable group policy for your users.
  5. Implement mandatory scheduled security scans. Devices that are not located in the work environment, can be used for many things other than work. This means that the attack surface can be wider with hardware devices, malicious downloads and physical access from malicious users being the biggest issues. For that reason, implement scheduled security scans (for example once a week), in order to manage potential security risks.
  6. Implement a more strict update policy. Client devices tend to stay outdated for long, which means that they can get vulnerable really easily and from one day to another. Implement an update policy and remind employees to keep their OS and all their applications up to date, in order to avoid security implications.

The current crisis situation can be overwhelming for everyone. IT departments get overloaded with requests and new tasks get created to support working from home. At the same time, working from home creates a whole new attack surface for companies, that malicious users can easily exploit. As big as it seems, there is only a handful of easy steps that a company has to follow in order to up its security game and be more sure about its assets and the headaches that a crisis can create. Stay safe, stay home, stay secure.

Thomas Sermpinis for Auxilium Cyber Security

Changes, changes and more changes!

Hey you, hey you,

I am still here, yes. I am still strong and continue to “hack” around. I do not want to apologize for leaving you alone for so long. I try to do my best for the community and for self-improvement, and today seems like a great day to give you an update. {sunny day in Berlin}

So, lets start from the end. I am currently in Berlin. I left my job as a Blockchain engineer and some really good proposals back in my home country, in order to get to know the “world” better and learn from the best. I am writing this post from a nice and huge wooden library, in the center of Berlin and it is a really good start. I am actively searching for a job, both in decentralization/blockchain/privacy and security sectors, so feel free to give some tips if you are from around, or contact me to grab a beer.

In other news, this was a hell of a year. I completed my academic life (yes I am leaning towards not starting a PhD), I got more into development because of my job and really liked it (Go, Solidity and other languages related to blockchain development), I developed some courses for Hakin9 including Attack and Defense in Blockchain technologies and Penetration testing with Raspberry Pi, I did some great talks in meetups and conferences regarding blockchain and decentralization (you can find my talks in my youtube channel) and released some articles in the BAD-ASS 2600 magazine.

OK, this not at all my whole year, but this is the stuff that stood out and that I want to share with you. As I said, I am now in Berlin, zeroing down the counter, and searching for the next big thing. I don’t know if I will work, if I will create a team, or start a PhD. I just know that I want to create things, share with others and get to know the world. And I don’t mind if one does not know me in the end. Because you will know me.

 

All great changes are preceded by chaos.
Deepak Chopra

 

Cr0wTom

Introduction to Bitcoin and Blockchain Technologies (Greek)

Are you still here,

As I told you in an earlier post, I have many things that I currently work in! One of them is my recent engagement with Blockchain and Decentralized Ledger Technologies. I started around a year ago with my master degree thesis, with title “PKI Decentralization with Blockchain Technologies” and after that I started working as a Blockchain Engineer in the Aristotle University of Thessaloniki.

This sector is really interesting, with many challenges at its current state, and that’s what I like about it. I also work with a great team of people, and this week I was lucky enough to talk in the Machine Learning and Blockchain join meetup in Thessaloniki about Bitcoin and Blockchain topics. Suddenly, the talk was in Greek and I upload a video capture of it on YouTube. In case I see interest in the video, I will try to add subtitles to it, but it needs some work, so we will see.

I want to thank the people that helped me reach this stage and make this talk, especially Dr. Karasavvas, and I will keep you updated for future talks and events. Also, thanks to everyone that joined me in this meetup, and if you have any questions please add it to the comments bellow or in the YouTube video.

Cr0wTom

TROOPERS18 and a crazy journey!

Hello friend,

Thinks are happening to my territory, and no time slots for this lonely blog. I see that many of you keep visiting though and I am really happy about it. I have many things to tell you. Many things happen in my life, and I want to continue to share with you my experiences in the security and privacy sector.

The last big think that happened, was TROOPERS18. My second time in this conference was outstanding, and even better than the first one. I don’t want to talk about the technicals of this conf. The main conference had some great talks, the PacketWars was really fun, and the interactions I had with the community made this experience awesome. But digging into them is a waste of time. I strongly suggest you to go and live it. Meet people, join talks and overall enjoy your time there. That’s what I did this year and marked it as one of the great experiences of my security life.

And as you know, I like to express myself through my videos and photographs, that’s why I prepared a video for you. Enjoy it, and give me your honest feedback 😀

See you at TROOPERS19 😉

Cr0wTom

BlackHat Europe 2017 – The Wrap Up

“Hello, friend. Hello, friend? That’s lame. Maybe I should give you a name, but that’s a slippery slope. You’re only in my head. We have to remember that. Shit.”

Hope you are all well.

After a nice trip to London, and a great time at Blackhat Europe 2017, I feel the need to share my experience with you. Everything started with the place hosting the event. Last year’s BlackHat was hosted in the Business Design Center, which was a really big and open place, perfect for the business hall and the briefings. And I was sceptical about the change of the place to Excel, but when I arrived I understood the need for a change.

The conference was twice as big, with twice the attendees. The briefing rooms were bigger and ready to welcome more people. Room B, where the keynotes and locknote took place, was outstanding, with an aura from BlackHat USA. Green lights everywhere and loud music. People from the industry talking in every corner, and great briefings taking place one after the other.

Last year I was a bit dissapointed from the event. Everything was so quiet, so soft. But this year everything got fixed. I met some great people, both from companies and individuals. Business hall was huge with great companies, prizes everywhere, and some challenges which was really missing from last years event. But the best part was the quality of the briefings, which was something that everyone talked about in the event. All these years Blackhat europe seemed a bit left off, in comparison with its USA sibling, in the aspect of briefings quality. But this year many talks were really great, presented from some really great researchers, so I encourage you to go and watch them as soon as they will be published in the YouTube channel of the event.

Finally, I have to thank illumio for the great prize at the Passport to prizes lucky draw, Jeff Moss and UBM for the Student Scholarship and the opportunity for attending this event for one more year, and everyone that made this event special. See you in the next one, and keep up the good work.

Cr0wTom

p.s. As always I produced a video from the event to bring you my experience. Feel free to Like, Comment, Subscribe or even Dislike my video, and support me. 😀

BlackHat, TROOPERS and more!

Hello guys,

I know you hoped that Cr0w’s Place is dead but I came to deny you. The main reason of my absence is my masters thesis, for which I want to talk you about.

So, basically my thesis is based on blockchain technologies and I am trying to develop an application (and find a way, generally) with which I will be able to bypass the Certificate Authorities of the SSL/TLS protocol. You will be able to read more details about it in my final paper, which will be published around March, but for the time being, you can head to my GitHub profile and give me some love.

In other news, I want to let you know that for one more year I will attend BlackHat Europe and TROOPERS. Just today I got informed from Niki (the nice lady that is responsible for TROOPERS) that I will attend the event with a scholarship for one more year. I am really happy about it and of course you will have coverage of the event from my YouTube channel and my short movies.

TROOPERS 18 takes place in Heidelberd, Germany in the 12th – 16th of March 2018, and BlackHat Europe in the 4,5 December 2017 which I will attend too. I will be happy to meet every one of you there. Until then, stay strong.

Cr0wTom