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💡Tip: Search for open ports
You Should Know:
1. Essential Tools for Port Scanning
- Nmap – The most powerful port scanner:
nmap -sV -T4 -p- <target_IP>
-sV: Service version detection-T4: Aggressive timing-p-: Scan all ports (1-65535)-
Masscan – Faster than Nmap for large scans:
masscan <target_IP> -p0-65535 --rate=1000
2. Common Vulnerable Ports
- 21 (FTP): Check for anonymous login
ftp <target_IP> Username: anonymous Password: (any)
- 22 (SSH): Test weak credentials
hydra -l root -P passwords.txt ssh://<target_IP>
- 80/443 (HTTP/HTTPS): Run directory bruteforce
dirb http://<target_IP> /usr/share/wordlists/dirb/common.txt
- 445 (SMB): Check for EternalBlue
nmap --script smb-vuln-ms17-010 <target_IP>
3. Automated Scanning with Recon
-
Recon-ng for OSINT:
recon-ng marketplace install all modules load recon/domains-hosts/bing_domain_web options set SOURCE example.com run
-
Metasploit for Exploitation:
msfconsole use auxiliary/scanner/portscan/tcp set RHOSTS <target_IP> run
4. Post-Exploitation Checks
- Check for Misconfigurations:
netstat -tuln
- Firewall Bypass Techniques:
nmap -f -D RND:10 <target_IP> Fragment packets & decoy scan
What Undercode Say
Open ports are the gateway to exploitation. Always:
✔ Scan aggressively but ethically.
✔ Verify false positives manually.
✔ Use `-sS` (Stealth SYN Scan) in Nmap for evasion.
✔ Monitor `dmesg` logs if testing on local systems.
✔ For Windows, use `netstat -ano` to check listening ports.
Test-NetConnection -ComputerName <target_IP> -Port 80 PowerShell port check
Prediction
With increasing IoT devices, open port vulnerabilities will rise by 30% in 2025, making automated scanning crucial for bug hunters.
Expected Output:
Nmap scan report for <target_IP> 22/tcp open ssh 80/tcp open http 443/tcp open https
References:
Reported By: Yasmeen Rezk – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
