Why Not Start with the Basics? A Guide to Cybersecurity Hardening

In cybersecurity, professionals often face complex situations such as sophisticated cyberattacks, spear phishing, ransomware, DDoS, and other critical incidents. These scenarios require immediate actions like identification, triage, investigation, containment, response, and mitigation. However, many of these situations can be avoided or minimized by ensuring proper foundational practices, such as system hardening.

System hardening is the process of securing systems by reducing vulnerabilities, removing unnecessary services, and applying security best practices. The Australian Cyber Security Centre (ACSC) provides a practical reference guide for Windows 10 and 11 hardening, which is a must-read for cybersecurity professionals, sysadmins, and IT teams.

You Should Know: Practical Hardening Steps and Commands

Here are some key steps and commands to implement hardening on Windows and Linux systems:

Windows Hardening

1. Disable Unnecessary Services:

• Open PowerShell as Administrator and run:

  Get-Service | Where-Object { $_.StartType -eq 'Automatic' } | Stop-Service -Force
  Set-Service -Name "ServiceName" -StartupType Disabled
  

• Replace `ServiceName` with the name of the service you want to disable.

2. Enable Windows Defender Firewall:

• Use the following command to ensure the firewall is active:

  Set-NetFirewallProfile -Profile Domain,Public,Private -Enabled True
  

3. Apply Security Baselines:

• Download and apply the ACSC’s Windows 10/11 Hardening Guide: ACSC Windows Hardening Guide.

4. Enable BitLocker for Disk Encryption:

• Use PowerShell to enable BitLocker:

  Enable-BitLocker -MountPoint "C:" -EncryptionMethod XtsAes256
  

Linux Hardening

1. Update and Upgrade System:

• Run the following commands to ensure your system is up-to-date:

  sudo apt update && sudo apt upgrade -y
  

2. Disable Unused Services:

• Use `systemctl` to disable unnecessary services:

  sudo systemctl disable servicename
  sudo systemctl stop servicename
  

3. Configure Firewall (UFW):

• Enable and configure UFW:

  sudo ufw enable
  sudo ufw allow ssh
  sudo ufw default deny incoming
  sudo ufw default allow outgoing
  

4. Harden SSH Access:

• Edit the SSH configuration file (/etc/ssh/sshd_config) and apply the following settings:

  PermitRootLogin no
  PasswordAuthentication no
  AllowUsers yourusername
  

5. Install and Configure Fail2Ban:

• Install Fail2Ban to prevent brute-force attacks:

  sudo apt install fail2ban
  sudo systemctl enable fail2ban
  sudo systemctl start fail2ban
  

What Undercode Say

System hardening is a critical step in securing your infrastructure. By following the ACSC’s guidelines and implementing the above commands, you can significantly reduce the attack surface of your systems. Whether you’re working with Windows or Linux, the key is to stay proactive, keep systems updated, and continuously monitor for vulnerabilities. For further learning, consider exploring advanced cybersecurity courses like the MBA in Information Security with AI offered by CECyber.

Relevant URLs:

• ACSC Windows Hardening Guide
• CECyber Information Security Programs
• CECyber MBA in Information Security with AI

References:

Reported By: Almirmeira Hardening – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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