What is Security Hardening?

Security hardening is the process of enhancing the security posture of a system or network by implementing a series of proactive measures to reduce vulnerabilities and mitigate potential risks. This involves configuring systems, applications, and infrastructure to adhere to best security practices, such as disabling unnecessary services, enforcing strong authentication mechanisms, applying patches and updates regularly, and configuring firewalls and intrusion detection systems. Security hardening aims to minimize the attack surface and strengthen defenses against cyber threats, reducing the likelihood of successful attacks and enhancing overall resilience to security breaches and unauthorized access.

Security hardening techniques

According to Forbes, hardening your attack surface is the best line of defense against cyber attacks. Isn’t that reason enough? In today’s day and age – cyber attacks are daily headline news, and an insecure IT environment is an open invitation. If there are simple steps or changes in processes that you can take to harden your ecosystem, now is the time to make it happen.

How to start security hardening?

First, think about how you can reduce the number of attack vectors. Here there’s definitely going to be a balancing act. After all, the only way to get a 100% safe environment is to remove everything. No systems or processes, no customer or employee data, and no business at all. AwesomeITDudes.com is the most secure business in the world – because I just made them up. All environments will have risk, but what you’re looking to remove is unnecessary risk. Do you have machines that are still connected to the network, but they aren’t in use? Do you have subscriptions to cloud tools that are lying dormant? Have you made sure all ex-employee credentials and accounts are unable to be used? These are just some of the questions you can ask yourself to ensure that there are no open items that need closing.

Top tip: Network Discovery tools can be a great help in providing visibility into unused assets such as drivers, services or software, as well as alert you to dormant systems and processes.

Security hardening ideas

Security hardening can take many forms, but once you feel confident that there’s nothing opening you up to risk that could be removed, it’s time to look at your existing processes. Yes, you need to take payments and customer data, but who needs access to that data? If you have cloud resources which hold your most sensitive data, these should be enforced with the tightest level of privileges, or if on-premises, segmented away from the rest of your environment. Think about using the Principle of Least Privilege.

Each user should have only the access they need to do their role, and no further. If this means more access requests – that’s a reasonable trade-off to ensure sensitive data is secured. This is a great way to harden your environment against a potential threat. Other ideas that can make a real difference without requiring huge investment or change are:

Workforce training: Make sure that all employees and clients have regular training on the latest threats and challenges. After all, 95% of security breaches are due to human error, according to IBM. Hardening your environment also means hardening the people who use that environment.

Automating patching and updates: Patches and security updates should be part of your business as usual, but are you relying on manual effort to ensure your machines are up to date? Both software and hardware patches can be updated automatically, ensuring that you never have a gap where attackers can take advantage of your delay.

Password management: Ultimately, a weak credential is a weak environment. In today’s connected world it only takes one user’s account to be breached to open the whole environment up to risk through lateral movement across a network. That’s why resetting default passwords, using hashing in password hygiene, and onboarding a solution for password rotation and secrets management is so important.

Data transfer processes: Many organizations fail to think about the way they store and send data, despite it being a huge part of how they work. Look at the SaaS tools you use to collaborate, send files, or discuss sensitive information. Do they, and the other applications you rely on, all encrypt their data in transit as well as at rest?

Keep really good records: Documentation is an important part of security hardening, and one which often gets forgotten. If something is unusual, even if it isn’t immediately dangerous – write it down! This will help your colleagues troubleshoot if the situation escalates, and provide better intelligence for incident response in case of a threat.

Windows 10 inherent hardening processes

Don’t forget, if you’re looking for some quick fixes, your system or your customer’s operating systems probably comes with some tools and applications as standard. For example, on Windows 10 you should make sure that you’re utilizing Device Guard, Credential Guard, Application Guard and Exploit Guard which all work as device hardening measures and are included when you set up the machine.

Make sure you’ve turned on Ransomware protection, which isn’t actually toggled on by default. If you want, you can also use Microsoft Edge on Windows in a sandbox environment, which can also add to the security of your environment for specific situations where you want to be able to browse without risk, for example if you’re 99.9% certain about a link, but don’t want that 0.1% to come back to bite you.

Security hardening in linux

Security hardening in Linux involves implementing measures such as disabling unnecessary services, applying regular updates and patches, configuring firewalls, enabling encryption, enforcing strong user authentication, setting file system permissions, implementing intrusion detection systems, and utilizing security-enhanced Linux (SELinux) or AppArmor to enforce mandatory access controls.

Atera and security hardening


Atera can aid in security hardening by providing features such as patch management to ensure systems are up to date, remote monitoring and management capabilities to identify vulnerabilities, integrated antivirus and malware protection, automation of security tasks, and access controls to restrict user permissions. Additionally, Atera offers network security monitoring tools and integrates with third-party security solutions to enhance overall cybersecurity posture.

Was this helpful?

The IT management platform that just works

Atera is the all-in-one platform built to remove blockers, streamline operations, and give you the tools to deliver results at any scale.