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Introduction:
The rise of bug bounty programs represents a fundamental shift in cybersecurity, transforming global ethical hackers into an outsourced security team. For IT professionals, understanding the tools and techniques of bug hunting is no longer a niche skill but a critical component of modern defensive security, providing insights into how attackers probe for weaknesses.
Learning Objectives:
- Master fundamental reconnaissance commands for discovering exposed assets and information leaks.
- Develop proficiency in web application vulnerability scanning and manual testing techniques.
- Implement advanced network assessment and service enumeration to identify misconfigurations.
You Should Know:
1. Subdomain Enumeration with Amass
`amass enum -d target.com -passive`
Subdomain discovery is the critical first step in expanding your attack surface. This Amass command performs passive enumeration using OSINT sources without sending direct traffic to the target. The `-passive` flag ensures stealthy reconnaissance while compiling a comprehensive list of subdomains. Follow with `amass db -names -d target.com` to view results from the internal database.
2. Port Scanning with Nmap Aggressive Detection
`nmap -A -T4 -p- target_ip`
This Nmap command performs aggressive scanning (-A) with timing template 4 (-T4) across all ports (-p-). The aggressive mode enables OS detection, version detection, script scanning, and traceroute. For production systems, consider `-sS -T3` for slower, less intrusive stealth SYN scanning while still gathering essential port information.
3. Web Directory Bruteforcing with Gobuster
`gobuster dir -u https://target.com -w /usr/share/wordlists/dirb/common.txt -x php,html,json`
Gobuster efficiently discovers hidden directories and files through wordlist enumeration. The `-x` parameter specifies extensions to append during scanning. Always start with common wordlists before progressing to more comprehensive lists. For API endpoints, add `-k` to ignore SSL certificate errors and `-t 50` to increase threads for faster scanning.
4. SSL/TLS Vulnerability Assessment
`testssl.sh –full https://target.com`
Testssl.sh provides comprehensive cryptographic vulnerability testing without dependencies. It checks for Heartbleed, POODLE, DROWN, and weak ciphers. For continuous monitoring, integrate with `nmap –script ssl-enum-ciphers -p 443 target.com. Always verify certificate transparency logs usingcurl -s “https://crt.sh/?q=target.com&output=json” | jq -r ‘.[].name_value’`.
5. SQL Injection Testing with SQLmap
`sqlmap -u “https://target.com/page?id=1” –batch –level=3 –risk=2`
SQLmap automates detection and exploitation of SQL injection flaws. The `–batch` flag runs non-interactively, while `–level` and `–risk` adjust testing intensity. For POST requests, use --data="param=value". Always test on authorized systems only and consider `–threads=5` for parallel testing on large applications.
6. API Endpoint Discovery and Testing
`curl -H “Authorization: Bearer $TOKEN” https://api.target.com/v1/users | jq`
API security requires thorough endpoint enumeration and authentication testing. This curl command with jq for JSON parsing helps inspect API responses. Combine with `arjun -u https://api.target.com/v1/users –get` to discover hidden parameters that might expose unauthorized data access or IDOR vulnerabilities.
7. Container Security Scanning with Trivy
`trivy image target_app:latest`
With containerized applications dominating modern infrastructure, Trivy scans Docker images for known vulnerabilities in OS packages and dependencies. For continuous integration, use `trivy image –exit-code 1 –severity CRITICAL target_app:latest` to fail builds when critical vulnerabilities are detected. Follow with `docker scout cves target_app` for additional context.
8. Cloud Storage Misconfiguration Scanning
`aws s3 ls s3://target-bucket/ –recursive –no-sign-request`
Misconfigured cloud storage remains a leading cause of data breaches. This AWS CLI command attempts anonymous access to S3 buckets. For comprehensive assessment, use `s3scanner –bucket target-bucket` and `cloud_enum -k target-name` to enumerate across multiple cloud platforms including Azure Blob Storage and Google Cloud Storage.
9. Cross-Site Scripting Verification with XSStrike
`python3 xsstrike.py -u “https://target.com/search?q=test” –crawl`
XSStrike employs multiple parsing engines and payload generation techniques to detect XSS vulnerabilities more effectively than traditional scanners. The `–crawl` flag automatically discovers and tests additional endpoints. Manual verification should include `` and other context-aware payloads.
10. Privilege Escalation Enumeration on Linux
`linpeas.sh -a | grep -i “cve\|sudo\|suid”`
LinPEAS automates Linux privilege escalation vector discovery. This grep filter focuses on CVEs, sudo permissions, and SUID binaries. Always run comprehensive checks including ps auxwww, netstat -tulpn, cat /etc/crontab, and `find / -perm -4000 2>/dev/null` for manual SUID binary identification.
11. Windows Security Policy Audit
`Get-LocalGroupMember Administrators | Format-Table`
PowerShell provides extensive Windows security auditing capabilities. This command enumerates local administrators. Combine with `Get-LocalUser | Where-Object {$_.Enabled -eq “True”}` to audit active accounts and `Get-Service | Where-Object {$_.StartType -eq “Auto”}` to identify automatically starting services that might be exploited.
12. Network Traffic Analysis with Tcpdump
`tcpdump -i any -n -s 0 -w capture.pcap ‘host target_ip and port not 22’`
This tcpdump command captures all traffic except SSH (port 22) for forensic analysis. The `-s 0` ensures full packet capture. For real-time monitoring, use `tcpdump -i any -n ‘tcp port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)’` to capture HTTP POST requests specifically.
13. Vulnerability Correlation with Searchsploit
`searchsploit –nmap targets.xml`
After service enumeration with Nmap, searchsploit correlates discovered services with known exploits. Generate the targets.xml with nmap -sV -oX targets.xml target_ip. Always verify exploit relevance and test in isolated environments before proceeding with vulnerability validation in production systems.
14. Web Application Firewall Bypass Testing
`byp4xx.sh https://target.com/restricted_endpoint`
Byp4xx automates testing of common HTTP response bypass techniques for 403 Forbidden and 401 Unauthorized endpoints. Manual testing should include URL encoding, HTTP method swapping (POST to GET), and header injection like `X-Original-URL` and `X-Rewrite-URL` that might bypass path-based restrictions.
15. DNS Reconnaissance and Zone Transfer
`dig AXFR @ns1.target.com target.com`
DNS zone transfer attempts can reveal internal network structure. If restricted, proceed with `dnsrecon -d target.com -t axfr` and subfinder -d target.com -silent. For comprehensive enumeration, combine with `dnsenum –dnsserver 8.8.8.8 target.com` to identify additional records through brute force.
What Undercode Say:
- The democratization of security testing through bug bounty programs has created a dual-edged sword: while organizations benefit from crowd-sourced security, the same techniques are rapidly adopted by malicious actors.
- Modern bug hunting requires full-stack knowledge spanning traditional network security, cloud infrastructure, and application-layer vulnerabilities, making specialized training essential for effective defense.
The proliferation of accessible security tools has lowered the barrier to entry for both defenders and attackers. Organizations must assume their external attack surface is continuously being probed with these exact methodologies. The strategic response involves not only fixing identified vulnerabilities but also implementing detection mechanisms for these reconnaissance patterns. Security teams should regularly run these same commands against their own assets to maintain awareness of their exposed attack surface and prioritize hardening efforts based on realistic threat modeling rather than theoretical compliance frameworks.
Prediction:
Within two years, AI-powered vulnerability discovery will transform bug bounty landscapes, with automated systems capable of finding complex logical flaws currently requiring human intuition. This will force a shift toward more sophisticated programmatic bug hunting while simultaneously making basic vulnerabilities increasingly scarce, ultimately raising the security baseline but creating new challenges in detecting AI-generated attack patterns.
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IT/Security Reporter URL:
Reported By: Ibk96 Got – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
