Closing Security Vulnerabilities in Cyber Security: Firewall, DDoS, and WAF Installat...

The Importance of Cyber Security

Cyber security is one of the most critical issues in today's digital world. To protect your servers, your data, and user information, you need to establish an effective security infrastructure. In this article, we will focus on closing security vulnerabilities with firewall, DDoS protection, and WAF (Web Application Firewall) installations.

Identifying Existing Issues

To identify a security vulnerability on your server, you can use some basic commands:

• top - Displays active processes on the server. You can identify processes that are consuming excessive CPU.
• htop - A more detailed process manager. It allows you to analyze resource usage on your system with a colorful and user-friendly interface.
• dmesg - Displays kernel logs. It can provide information about hardware errors or security breaches.

Solution Steps

1. Firewall Installation

You can protect your server from external threats by installing a firewall. For example, let's set up a simple configuration using UFW (Uncomplicated Firewall):

sudo apt update
sudo apt install ufw
sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw enable

With the above commands, we have allowed SSH, HTTP, and HTTPS traffic.

2. DDoS Protection

To protect against DDoS attacks, you can use fail2ban and iptables. You can ban specific IPs with fail2ban:

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

This way, you can automatically block repeated malicious requests.

3. WAF Installation

It is essential to install a WAF to protect your web applications. You can install a WAF on Apache using ModSecurity:

sudo apt install libapache2-modsecurity
sudo a2enmod security2
sudo systemctl restart apache2

With the default rules that come with ModSecurity, you can block many attacks.

Final Checks

Don't forget to restart your system after making changes:

sudo systemctl restart apache2
sudo systemctl restart ufw

Conclusion

Cyber security requires constant attention and updates. By following the steps mentioned above, you can secure your server and take precautions against potential threats.