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Security Scanners

Overview

Security scanners are tools that help identify vulnerabilities and security weaknesses in your Linux server. They play a crucial role in the security hardening process by providing insights into potential threats. This guide covers popular security scanners and their usage in assessing server security.

OpenVAS

  • Description: OpenVAS (Open Vulnerability Assessment System) is an open-source vulnerability scanner that can detect a wide range of security issues.
  • Usage: Install OpenVAS on your system and use its web interface, the Greenbone Security Assistant, to configure and run scans against your server.
  • Example Command: 
    openvas-setup   # Set up OpenVAS
openvas-start   # Start the OpenVAS services

Nessus

  • Description: Nessus is a commercial vulnerability scanner known for its extensive plugin library and regular updates.
  • Usage: Install Nessus on your system, configure scan policies, and run scans to identify vulnerabilities. Nessus Essentials offers a free version with limited functionality.
  • Example Command: 
    nessuscli update  # Update Nessus plugins
nessusd -q        # Start the Nessus daemon

Qualys

  • Description: Qualys is a cloud-based vulnerability scanner that offers continuous monitoring and compliance reporting.
  • Usage: Sign up for a Qualys account, configure scanning options, and use the web interface to manage and run scans on your server.
  • Example Usage: Access the Qualys web interface and create a new scan targeting your server's IP address.

Nmap

  • Description: Nmap (Network Mapper) is an open-source tool for network discovery and security auditing.
  • Usage: Use Nmap to scan your server for open ports, services, and vulnerabilities.
  • Example Command: 
    nmap -sV -T4 -A -v 192.168.1.1  # Scan for services and vulnerabilities

Metasploit

  • Description: Metasploit is a framework for penetration testing and exploiting vulnerabilities.
  • Usage: Use Metasploit to test your server for known vulnerabilities and validate the effectiveness of your security measures.
  • Example Usage: Launch the Metasploit console and use modules to exploit identified vulnerabilities.

Best Practices

  • Regular Scanning: Schedule regular scans to detect new vulnerabilities as they emerge.
  • Remediate Findings: Prioritize and address identified vulnerabilities to reduce the risk of exploitation.
  • Validate Remediation: Re-scan after remediation to ensure that vulnerabilities have been successfully resolved.
  • Stay Informed: Keep up with the latest security news and updates to ensure your scanning tools are up-to-date and effective.

By incorporating security scanners into your security practices, you can proactively identify and address vulnerabilities, enhancing the overall security of your Linux server.