What is Vulnerability Scanning?

Vulnerability scanning is the process of systematically examining computers, networks, and applications to identify security weaknesses that could be exploited by attackers. It's a proactive approach to security that helps organizations find and fix vulnerabilities before they can be used in attacks.

🔍 Continuous Process

Vulnerability scanning should be conducted regularly, as new vulnerabilities are discovered daily and systems change over time.

Types of Vulnerability Scans

Network Vulnerability Scans

Examine network devices, servers, and endpoints for known vulnerabilities and misconfigurations.

External Scans

Performed from outside the network to identify internet-facing vulnerabilities

Internal Scans

Conducted from within the network to find internal security gaps

Web Application Scans

Focus on web applications to identify issues like SQL injection, XSS, and other application-level vulnerabilities.

Database Scans

Specifically target database systems to find configuration issues and known vulnerabilities.

Credentialed vs Non-Credentialed

Credentialed scans provide more comprehensive results by accessing systems with valid credentials.

Vulnerability Scanning Process

Planning

Define scope, objectives, and schedule for scanning activities

Discovery

Identify active systems, services, and applications within scope

Scanning

Execute vulnerability scans using appropriate tools and techniques

Analysis

Review and validate scan results, prioritize findings

Remediation

Address identified vulnerabilities through patching or configuration changes

Verification

Rescan to confirm vulnerabilities have been properly addressed

Common Vulnerability Types

Frequently Found Issues

  • Unpatched software and operating systems
  • Default or weak credentials
  • Misconfigured security settings
  • Unnecessary open ports and services
  • SQL injection vulnerabilities
  • Cross-site scripting (XSS) flaws
  • Insecure cryptographic storage
  • Missing security headers

Vulnerability Scanning Tools

Commercial Solutions

Nessus, Qualys, Rapid7 Nexpose, Tenable.sc

Open Source Tools

OpenVAS, Nikto, Nmap with NSE scripts, OWASP ZAP

Cloud-based Scanners

Qualys Cloud Platform, Tenable.io, Rapid7 InsightVM

Web Application Scanners

Burp Suite, Acunetix, Netsparker, OWASP ZAP

Best Practices

Effective Vulnerability Management

  • Establish a regular scanning schedule
  • Use both authenticated and unauthenticated scans
  • Prioritize vulnerabilities based on risk
  • Integrate scanning into change management processes
  • Maintain accurate asset inventory
  • Document scanning procedures and results
  • Train staff on vulnerability management

Risk Prioritization

CVSS Scores

Use Common Vulnerability Scoring System to assess severity

Asset Criticality

Consider the importance and exposure of affected systems

Exploit Availability

Prioritize vulnerabilities with known exploits

Business Impact

Assess potential damage to business operations