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This skill should be used when the user asks to "perform vulnerability scanning", "scan networks for open ports", "assess web application security", "scan…
Security Scanning Tools Purpose Master essential security scanning tools for network discovery, vulnerability assessment, web application testing, wireless security, and compliance validation. This skill covers tool selection, configuration, and practical usage across different scanning categories. Prerequisites Required Environment Linux-based system (Kali Linux recommended) Network access to target systems Proper authorization for scanning activities Required Knowledge Basic networking concepts (TCP/IP, ports, protocols) Understanding of common vulnerabilities Familiarity with command-line interfaces Outputs and Deliverables Network Discovery Reports - Identified hosts, ports, and services Vulnerability Assessment Reports - CVEs, misconfigurations, risk ratings Web Application Security Reports - OWASP Top 10 findings Compliance Reports - CIS benchmarks, PCI-DSS, HIPAA checks Core Workflow Phase 1: Network Scanning Tools Nmap (Network Mapper) Primary tool for network discovery and security auditing: # Host discovery nmap -sn 192.168.1.0/24 # Ping scan (no port scan) nmap -sL 192.168.1.0/24 # List scan (DNS resolution) nmap -Pn 192.168.1.100 # Skip host discovery # Port scanning techniques nmap -sS 192.168.1.100 # TCP SYN scan (stealth) nmap -sT 192.168.1.100 # TCP connect scan nmap -sU 192.168.1.100 # UDP scan nmap -sA 192.168.1.100 # ACK scan (firewall detection) # Port specification nmap -p 80,443 192.168.1.100 # Specific ports nmap -p- 192.168.1.100 # All 65535 ports nmap -p 1-1000 192.168.1.100 # Port range nmap --top-ports 100 192.168.1.100 # Top 100 common ports # Service and OS detection nmap -sV 192.168.1.100 # Service version detection nmap -O 192.168.1.100 # OS detection nmap -A 192.168.1.100 # Aggressive (OS, version, scripts) # Timing and performance nmap -T0 192.168.1.100 # Paranoid (slowest, IDS evasion) nmap -T4 192.168.1.100 # Aggressive (faster) nmap -T5 192.168.1.100 # Insane (fastest) # NSE Scripts nmap --script=vuln 192.168.1.100 # Vulnerability scripts nmap --script=http-enum 192.168.1.100 # Web enumeration nmap --script=smb-vuln* 192.168.1.100 # SMB vulnerabilities nmap --script=default 192.168.1.100 # Default script set # Output formats nmap -oN scan.txt 192.168.1.100 # Normal output nmap -oX scan.xml 192.168.1.100 # XML output nmap -oG scan.gnmap 192.168.1.100 # Grepable output nmap -oA scan 192.168.1.100 # All formats Masscan High-speed port scanning for large networks: # Basic scanning masscan -p80 192.168.1.0/24 --rate=1000 masscan -p80,443,8080 192.168.1.0/24 --rate=10000 # Full port range masscan -p0-65535 192.168.1.0/24 --rate=5000 # Large-scale scanning masscan 0.0.0.0/0 -p443 --rate=100000 --excludefile exclude.txt # Output formats masscan -p80 192.168.1.0/24 -oG results.gnmap masscan -p80 192.168.1.0/24 -oJ results.json masscan -p80 192.168.1.0/24 -oX results.xml # Banner grabbing masscan -p80 192.168.1.0/24 --banners Phase 2: Vulnerability Scanning Tools Nessus Enterprise-grade vulnerability assessment: # Start Nessus service sudo systemctl start nessusd # Access web interface # https://localhost:8834 # Command-line (nessuscli) nessuscli scan --create --name "Internal Scan" --targets 192.168.1.0/24 nessuscli scan --list nessuscli scan --launch <scan_id> nessuscli report --format pdf --output report.pdf <scan_id> Key Nessus features: Comprehensive CVE detection Compliance checks (PCI-DSS, HIPAA, CIS) Custom scan templates Credentialed scanning for deeper analysis Regular plugin updates OpenVAS (Greenbone) Open-source vulnerability scanning: # Install OpenVAS sudo apt install openvas sudo gvm-setup # Start services sudo gvm-start # Access web interface (Greenbone Security Assistant) # https://localhost:9392 # Command-line operations gvm-cli socket --xml "<get_version/>" gvm-cli socket --xml "<get_tasks/>" # Create and run scan gvm-cli socket --xml ' <create_target> <name>Test Target</name> <hosts>192.168.1.0/24</hosts> </create_target>' Phase 3: Web Application Scanning Tools Burp Suite Comprehensive web application testing: # Proxy configuration 1. Set browser proxy to 127.0.0.1:8080 2. Import Burp CA certificate for HTTPS 3. Add target to scope # Key modules: - Proxy: Intercept and modify requests - Spider: Crawl web applications - Scanner: Automated vulnerability detection - Intruder: Automated attacks (fuzzing, brute-force) - Repeater: Manual request manipulation - Decoder: Encode/decode data - Comparer: Compare responses Core testing workflow: Configure proxy and scope Spider the application Analyze sitemap Run active scanner Manual testing with Repeater/Intruder Review findings and generate report OWASP ZAP Open-source web application scanner: # Start ZAP zaproxy # Automated scan from CLI zap-cli quick-scan https://target.com # Full scan zap-cli spider https://target.com zap-cli active-scan https://target.com # Generate report zap-cli report -o report.html -f html # API mode zap.sh -daemon -port 8080 -config api.key=<your_key> ZAP automation: # Docker-based scanning docker run -t owasp/zap2docker-stable zap-full-scan.py \ -t https://target.com -r report.html # Baseline scan (passive only) docker run -t owasp/zap2docker-stable zap-baseline.py \ -t https://target.com -r report.html Nikto Web server vulnerability scanner: # Basic scan nikto -h https://target.com # Scan specific port nikto -h target.com -p 8080 # Scan with SSL nikto -h target.com -ssl # Multiple targets nikto -h targets.txt # Output formats nikto -h target.com -o report.html -Format html nikto -h target.com -o report.xml -Format xml nikto -h target.com -o report.csv -Format csv # Tuning options nikto -h target.com -Tuning 123456789 # All tests nikto -h target.com -Tuning x # Exclude specific tests Phase 4: Wireless Scanning Tools Aircrack-ng Suite Wireless network penetration testing: # Check wireless interface airmon-ng # Enable monitor mode sudo airmon-ng start wlan0 # Scan for networks sudo airodump-ng wlan0mon # Capture specific network sudo airodump-ng -c <channel> --bssid <target_bssid> -w capture wlan0mon # Deauthentication attack sudo aireplay-ng -0 10 -a <bssid> wlan0mon # Crack WPA handshake aircrack-ng -w wordlist.txt -b <bssid> capture*.cap # Crack WEP aircrack-ng -b <bssid> capture*.cap Kismet Passive wireless detection: # Start Kismet kismet # Specify interface kismet -c wlan0 # Access web interface # http://localhost:2501 # Detect hidden networks # Kismet passively collects all beacon frames # including those from hidden SSIDs Phase 5: Malware and Exploit Scanning ClamAV Open-source antivirus scanning: # Update virus definitions sudo freshclam # Scan directory clamscan -r /path/to/scan # Scan with verbose output clamscan -r -v /path/to/scan # Move infected files clamscan -r --move=/quarantine /path/to/scan # Remove infected files clamscan -r --remove /path/to/scan # Scan specific file types clamscan -r --include='\.exe$|\.dll$' /path/to/scan # Output to log clamscan -r -l scan.log /path/to/scan Metasploit Vulnerability Validation Validate vulnerabilities with exploitation: # Start Metasploit msfconsole # Database setup msfdb init db_status # Import Nmap results db_import /path/to/nmap_scan.xml # Vulnerability scanning use auxiliary/scanner/smb/smb_ms17_010 set RHOSTS 192.168.1.0/24 run # Auto exploitation vulns # View vulnerabilities analyze # Suggest exploits Phase 6: Cloud Security Scanning Prowler (AWS) AWS security assessment: # Install Prowler pip install prowler # Basic scan prowler aws # Specific checks prowler aws -c iam s3 ec2 # Compliance framework prowler aws --compliance cis_aws # Output formats prowler aws -M html json csv # Specific region prowler aws -f us-east-1 # Assume role prowler aws -R arn:aws:iam::123456789012:role/ProwlerRole ScoutSuite (Multi-cloud) Multi-cloud security auditing: # Install ScoutSuite pip install scoutsuite # AWS scan scout aws # Azure scan scout azure --cli # GCP scan scout gcp --user-account # Generate report scout aws --report-dir ./reports Phase 7: Compliance Scanning Lynis Security auditing for Unix/Linux: # Run audit sudo lynis audit system # Quick scan sudo lynis audit system --quick # Specific profile sudo lynis audit system --profile server # Output report sudo lynis audit system --report-file /tmp/lynis-report.dat # Check specific section sudo lynis show profiles sudo lynis audit system --tests-from-group malware OpenSCAP Security compliance scanning: # List available profiles oscap info /usr/share/xml/scap/ssg/content/ssg-<distro>-ds.xml # Run scan with profile oscap xccdf eval --profile xccdf_org.ssgproject.content_profile_pci-dss \ --report report.html \ /usr/share/xml/scap/ssg/content/ssg-rhel8-ds.xml # Generate fix script oscap xccdf generate fix \ --profile xccdf_org.ssgproject.content_profile_pci-dss \ --output remediation.sh \ /usr/share/xml/scap/ssg/content/ssg-rhel8-ds.xml Phase 8: Scanning Methodology Structured scanning approach: Planning Define scope and objectives Obtain proper authorization Select appropriate tools Discovery Host discovery (Nmap ping sweep) Port scanning Service enumeration Vulnerability Assessment Automated scanning (Nessus/OpenVAS) Web application scanning (Burp/ZAP) Manual verification Analysis Correlate findings Eliminate false positives Prioritize by severity Reporting Document findings Provide remediation guidance Executive summary Phase 9: Tool Selection Guide Choose the right tool for each scenario: Scenario Recommended Tools Network Discovery Nmap, Masscan Vulnerability Assessment Nessus, OpenVAS Web App Testing Burp Suite, ZAP, Nikto Wireless Security Aircrack-ng, Kismet Malware Detection ClamAV, YARA Cloud Security Prowler, ScoutSuite Compliance Lynis, OpenSCAP Protocol Analysis Wireshark, tcpdump Phase 10: Reporting and Documentation Generate professional reports: # Nmap XML to HTML xsltproc nmap-output.xml -o report.html # OpenVAS report export gvm-cli socket --xml '<get_reports report_id="<id>" format_id="<pdf_format>"/>' # Combine multiple scan results # Use tools like Faraday, Dradis, or custom scripts # Executive summary template: # 1. Scope and methodology # 2. Key findings summary # 3. Risk distribution chart # 4. Critical vulnerabilities # 5. Remediation recommendations # 6. Detailed technical findings Quick Reference Nmap Cheat Sheet Scan Type Command Ping Scan nmap -sn <target> Quick Scan nmap -T4 -F <target> Full Scan nmap -p- <target> Service Scan nmap -sV <target> OS Detection nmap -O <target> Aggressive nmap -A <target> Vuln Scripts nmap --script=vuln <target> Stealth Scan nmap -sS -T2 <target> Common Ports Reference Port Service 21 FTP 22 SSH 23 Telnet 25 SMTP 53 DNS 80 HTTP 443 HTTPS 445 SMB 3306 MySQL 3389 RDP Constraints and Limitations Legal Considerations Always obtain written authorization Respect scope boundaries Follow responsible disclosure practices Comply with local laws and regulations Technical Limitations Some scans may trigger IDS/IPS alerts Heavy scanning can impact network performance False positives require manual verification Encrypted traffic may limit analysis Best Practices Start with non-intrusive scans Gradually increase scan intensity Document all scanning activities Validate findings before reporting Troubleshooting Scan Not Detecting Hosts Solutions: Try different discovery methods: nmap -Pn or nmap -sn -PS/PA/PU Check firewall rules blocking ICMP Use TCP SYN scan: nmap -PS22,80,443 Verify network connectivity Slow Scan Performance Solutions: Increase timing: nmap -T4 or -T5 Reduce port range: --top-ports 100 Use Masscan for initial discovery Disable DNS resolution: -n Web Scanner Missing Vulnerabilities Solutions: Authenticate to access protected areas Increase crawl depth Add custom injection points Use multiple tools for coverage Perform manual testing
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