Learn how systems hardening methods help to protect your networks, hardware, and valuable data by reducing your overall threat profile.
Cybersecurity has become one of the hottest topics in both the information technology and the business worlds, but the subject can seem fairly overwhelming to the average business owner or C-level executive. Cybersecurity is a complex subject after all, and simply understanding a handful of advanced security protocols or a set of compliance standards can be challenging.
Thankfully, cybersecurity is a layered practice, and we can understand a great deal about protecting an organization by looking at one of the layers right at the surface: systems hardening. Systems hardening sets the groundwork for a secure IT infrastructure — akin to “cleaning house” before moving in all of the more advanced tools and protocols that make up a total security strategy.
What this post will cover:
What does systems hardening mean?
Why is systems hardening important?
Systems hardening standards and best practices
The five areas of system hardening
An example systems hardening checklist
What is systems hardening?
Systems hardening refers to the tools, methods, and best practices used to reduce the attack surface in technology infrastructure, including software, data systems, and hardware. The purpose of systems hardening is to reduce the overall “threat profile” or vulnerable areas of the system. Systems hardening involves the methodical auditing, identification, and remediation of potential security vulnerabilities throughout an organization, often with an emphasis on adjusting various default settings and configurations to make them more secure.
With system hardening, the objective is to eliminate as many security risks as possible. By minimizing the attack surface, bad actors have fewer means of entry or potential footholds for initiating a cyberattack.
The attack surface is defined as a combination of all the potential flaws and backdoors in technology that could be exploited. These vulnerabilities typically include:
Default passwords or credentials stored in accessible files
Unpatched software and firmware
Poorly configured infrastructure devices
Failure to correctly set user permissions
Improperly setup cybersecurity tools
What are the benefits of systems hardening?
Systems hardening is an essential function for both security and compliance and a crucial part of a broader information security strategy. The most clear benefit of systems hardening is the reduced risk of cyber attacks and associated downtime and regulatory penalties.
From a security standpoint, system hardening is an excellent priority to embrace before/alongside deploying security solutions such as EDR tools. After all, using such solutions on poorly configured systems is like installing window bars and security cameras on a home, but failing to close the back door. Regardless of how advanced the security tools may be, an unhardened system will likely still have vulnerabilities that make bypassing these measures possible.
System hardening must be considered throughout the IT lifecycle, from initial installation, through configuration, maintenance, and to end-of-life. Systems hardening is also mandated by all major compliance frameworks, such as PCI, DSS, and HIPAA.
5 types of systems hardening
Although the definition of system hardening applies throughout an organization’s IT infrastructure, there are several subsets of the idea that require different approaches and tools.
1) Network hardening
Network devices are hardened to counter unauthorized access into a network’s infrastructure. In this type of hardening, vulnerabilities in device management and configurations are sought out and corrected to prevent their exploitation by bad actors who wish to gain access to the network. Increasingly, hackers use weaknesses in network device configurations and routing protocols to establish persistence presence in a network rather than attacking specific end-points.
2) Server hardening
The server hardening process revolves around securing the data, ports, components, functions, and permissions of a server. These protocols are executed systemwide on the hardware, firmware, and software layers.
3) Application hardening
Application hardening is centered around software installed on the network. A large aspect of application hardening — sometimes called software hardening or software application hardening — is patching and updating vulnerabilities. Again, patch management through automation is often a key tool in this approach.
Application hardening also involves updating or rewriting application code to further enhance its security, or deploying additional software-based security solutions.
4) Database hardening
Database hardening centers on reducing vulnerabilities in digital databases and database management systems (DBMS). The goal is to harden repositories of data, as well as the software used to interact with that data.
5) Operating system hardening
Operating system hardening involves securing a common target of cyberattack -- a server’s operating system (OS). As with other types of software, hardening an operating system typically involves patch management that can monitor and install updates, patches, and service packs automatically.
What are the best practices for systems hardening?
Begin with planning out your approach to systems hardening. Hardening an entire network can seem daunting, so creating a strategy around progressive changes is usually the best way to manage the process. Prioritize risks identified within your technology ecosystem and use an incremental approach to address the flaws in a logical order.
Address patching and updating immediately. An automated and comprehensive patch management tool is essential for systems hardening. This step can usually be executed very quickly and will go a long way toward closing off potential entry points.
Network hardening best practices
Ensure your firewall is properly configured and that all rules are regularly audited and updated as needed
Secure remote access points and remote users
Block any unnecessary network ports
Disable and remove unused or extraneous protocols and services
In addition to the above, it's worth reiterating that finding and removing unnecessary accounts and privileges throughout your IT infrastructure is key to effective systems hardening.
And, when in doubt, CIS. All the major compliance frameworks, including PCI-DSS and HIPAA, point to CIS Benchmarks as the accepted best practice. As a result, if your organization needs to be compliant with one or more frameworks, adhering to CIS Benchmarks is required. Learn more about the CIS Benchmarks and CIS Controls.
Example systems hardening checklist
Regular network auditing
Limit users and secure access points
Block unused network ports
Encrypt network traffic
Disallow anonymous access
Review and allocate administrative access and rights (least privilege)
Servers are located in a secure data center
Disallow shutdown initiation without verification
Remove unnecessary software
Set application access control
Automate patch management
Remove default passwords
Implement password hygiene best practices
Configure account lockout policies
Implement admin restrictions on access
Encrypt data in transit and at rest
Enable node checking
Remove unused accounts
Operating system hardening
Apply necessary updates and patches automatically
Remove unnecessary files, libraries, drivers, and functionality
Log all activity, errors, and warnings
Set user permissions and group policies
Configure file system and registry permissions
How can NinjaOne help?
NinjaOne is a powerful, easy-to-use remote monitoring and management platform that provides a single-pane-of-glass view into all the endpoints within an organization, and all the tools IT teams need to improve delivery. Our platform simplifies and automates the day-to-day work of managed service providers and IT professionals so they can focus on complex, value-added services, end-user relationships, and strategic projects.
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Building an efficient and effective IT team requires a centralized solution that acts as your core service deliver tool. NinjaOne enables IT teams to monitor, manage, secure, and support all their devices, wherever they are, without the need for complex on-premises infrastructure.
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