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A Comprehensive Overview of OS Hardening

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By AMSAT Feb 1,2021

A Comprehensive Overview of OS Hardening

Based on the theory of least privilege, hardening is about reducing the attack surface available to the threat actors and other malicious hackers. Hardening is a vital component of information security and includes the principles of deterrence, denial, delay and detection.

OS hardening

This is the act of putting together an OS strongly, updating it, making rules and strategies to help supervise the system securely, eliminating unnecessary applications and services. The purpose of this exercise is to reduce a computer OS’s contact to threats and to alleviate possible risk. OS hardening is one of the most significant steps toward thorough information security, since operating systems evolve over time and add more features and capabilities.

Windows hardening

Windows is packed with a collection of features, applications and software that ought to be properly configured to guarantee the system is as hardened as possible.

Secure installation

Windows 10 must be installed fresh on a system. It’s important to create or find an appropriate installation media for your Windows 10 system (a reliable USB drive, preferably).

Clean up unwanted programs

Even in fresh installations of Windows 10, a system is expected to have unnecessary programs installed, which expand the attack surface, making it easy for hackers to unleash attacks. Make sure you confirm that all installed programs are authentic and not bootlegged software, which could be filled with bloat and malware.


It’s essential to encode hard drives. Windows 10 is equipped with BitLocker and hasan easy encryption process. Trusted Platform Module (TPM) must be empowered to encode with BitLocker. Advanced editions of Windows 10 are equipped with TPM aided by default, while secure boot should be used together with encryption, linking the hard drive to the system hardware and ensuring that only Microsoft-trusted firmware is used upon boot.

BIOS configuration

Windows 10 systems come laden with a Basic Input Output System (BIOS) like previous versions of Windows. The BIOS has a DOS-ish interface but doesn’t require wide-ranging coding experience to operate. Before working with the BIOS, research whether your Windows 10 variant has any BIOS configuration applicable to it, then configure away.

Linux hardening

Most systems have confidential data that should be protected. To do this, we need to protect our Linux system, by physically taking security measures to prevent unauthorized people from access the system in the first place. Then installation should be done properly, so a strong foundation is there. Finally, a set of common security measures need to be applied. Once it’s all done, your server or desktop system should be effectively secured.

Fundamental rules of system hardening

System hardening can be divided into a few core principles. These include the principle of least privilege, segmentation, and reduction.

Principe of least privilege

The principle of least privileges suggests that you give users and processes the bare minimum of consent to do their job. It is like granting a visitor access to a building. You could give full access to the building, including all sensitive areas. The other option is to only let your guest access a single floor where they need to be. The choice is easy, right?


  • When read-only access is sufficient, don’t give write permissions
  • Don’t allow executable code in memory areas that are highlighted as data sections
  • Do not run applications as the root user, as an alternative use a non-privileged user account


The next principle is that you divide greater areas into smaller ones. If we look at that building again, we have split it into numerous floors. Each floor can be additionally divided into diverse regions. Perhaps you visitor is only permitted on floor 4, in the blue zone. If we interpret this to Linux security, this code would apply to memory usage. Each process can only access their own memory sections.


The objective of this principle is to eliminate something that is not sternly needed for the system to work. It appears like the principle of least privilege, yet it focuses on averting something altogether.

Steps of system hardening


1.  Install security updates and patches
2.  Use strong passwords
3.  Bind processes to local host
4.  Implement a firewall
5.  Keep things clean
6.  Security configurations
7.  Limit access
8.  Monitor your systems
9.  Create backups (and test!)
10.  Perform system auditing


Contemporary computing environments are discrete infrastructures which need any organization to develop interruption finding plans for the servers. An organization must similarly update its computer arrangement plan when relevant changes occur. The environment will only work efficiently if the process is centralized. Therefore, it’s incumbent upon financial institutions to develop, execute and monitor suitable information security programs. Whether systems are maintained in-house or by a third-party vendor, appropriate security controls and risk management systems should be put into place.


  • OS Hardening
  • Security Updates
  • Windows hardening

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