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Introduction:
The path to a successful bug bounty career is often shrouded in mystery, but a recent $100 payout on Bugcrowd reveals a clear roadmap. This achievement, recognized by top-tier organizations, underscores that foundational skills in reconnaissance (Recon) and Open-Source Intelligence (OSINT) are the true keys to unlocking critical vulnerabilities. For aspiring penetration testers, mastering these initial phases of a security assessment is non-negotiable for consistently finding security flaws before malicious actors do.
Learning Objectives:
- Understand the core principles and critical importance of Reconnaissance and OSINT in modern bug bounty hunting.
- Learn to assemble and utilize a practical toolkit for automated and manual asset discovery and vulnerability scanning.
- Develop a methodological approach to triage results and identify low-hanging fruit for efficient bug submissions.
You Should Know:
1. Laying the Foundation: The Reconnaissance Mindset
Reconnaissance is the first and most critical phase of any penetration test or bug bounty hunt. It involves passively and actively gathering information about a target to map its digital attack surface. The goal is to discover every possible entry point: domains, subdomains, IP addresses, open ports, running services, and even information leaked on third-party sites or code repositories. A narrow target scope is the most common reason for failure; comprehensive recon often reveals overlooked and vulnerable assets.
Step‑by‑step guide explaining what this does and how to use it.
Step 1: Define Your Scope. Start with a single root domain from a bug bounty program (e.g., example.com). Read the program’s scope documentation carefully to understand which assets are in and out of bounds.
Step 2: Passive Subdomain Enumeration. Use tools that collect data without directly touching the target’s infrastructure.
Command (Linux):
subfinder -d example.com -silent > subdomains.txt assetfinder --subs-only example.com >> subdomains.txt amass enum -passive -d example.com -o subdomains_amass.txt
Explanation: `subfinder` and `assetfinder` query various sources to find subdomains. `Amass` in passive mode does the same with an extensive database. Combining results from multiple tools ensures broader coverage.
Step 3: Active Subdomain Enumeration. Use tools that interact with the target, such as performing DNS bruteforcing.
Command (Linux):
amass enum -active -brute -d example.com -w /usr/share/wordlists/subdomains.txt -o active_subdomains.txt
Explanation: The `-active` and `-brute` flags tell Amass to perform a DNS bruteforce attack using a wordlist, attempting to discover subdomains like `dev.example.com` or `test.example.com` that may not be publicly listed.
2. Uncovering Hidden Assets: The Power of OSINT
OSINT goes beyond automated subdomain discovery. It involves scouring the public internet for data leaks, exposed API keys, old source code, and employee information that could be leveraged for a social engineering attack or to gain unauthorized access. A single exposed API key on a GitHub commit can be more valuable than a complex technical exploit.
Step‑by‑step guide explaining what this does and how to use it.
Step 1: Hunt for Exposed Secrets. Scan GitHub and other code repositories for accidental commits containing passwords, API keys, or authentication tokens.
Tool: Use `git-hound` or manually search GitHub with queries like `”example.com” AND “api_key”` or "password" AND "target.com".
Command (Linux with git-hound):
echo "example.com" | git-hound --dig-files --dig-commits --threads 100
Explanation: This command will search for commits and files related to `example.com` that may contain sensitive information, using a high number of threads for speed.
Step 2: Investigate SSL Certificates. Certificate Transparency (CT) logs are a goldmine for discovering subdomains, including those used for internal or staging environments.
Tool: Use `crt.sh` from your browser or a command-line tool.
Command (Linux):
curl -s "https://crt.sh/?q=%.example.com&output=json" | jq -r '.[].name_value' | sed 's/\.//g' | sort -u > crt_subdomains.txt
Explanation: This curl command queries crt.sh for certificates issued for `example.com` and any subdomains, parses the JSON output with jq, and cleans up the data to produce a clean list of subdomains.
3. Probing for Weaknesses: Service Discovery and Fingerprinting
Once you have a list of live subdomains and IPs, you need to understand what services are running on them. Identifying the technology stack (e.g., WordPress, Jenkins, a custom API) allows you to tailor your attacks and search for known vulnerabilities specific to those technologies.
Step‑by‑step guide explaining what this does and how to use it.
Step 1: Probe for Live Hosts. Filter your subdomain list to find哪些are actually live and accessible.
Command (Linux – HTTP/HTTPS):
cat subdomains.txt | httpx -silent > live_hosts.txt
Explanation: `Httpx` takes a list of domains and checks if they respond on HTTP/HTTPS ports, quickly separating active web servers from dead ends.
Step 2: Port Scanning. Discover other services running on non-standard ports.
Command (Linux with Naabu):
naabu -list subdomains.txt -top-ports 1000 -o naabu_ports.txt
Explanation: `Naabu` is a fast port scanner. Scanning the top 1000 ports can reveal services like SSH (22), FTP (21), databases (3306, 5432), or management interfaces (8080, 8443) that may be misconfigured.
- Automated Initial Testing: The Power of Vulnerability Scanners
While manual testing is crucial, automated scanners can help you quickly identify low-hanging fruit and common misconfigurations across a large number of targets. This allows you to prioritize your manual efforts on the most promising targets.
Step‑by‑step guide explaining what this does and how to use it.
Step 1: Run a Nuclei Scan. Nuclei uses a community-powered database of templates to check for thousands of known vulnerabilities.
Command (Linux):
nuclei -list live_hosts.txt -severity low,medium,high,critical -o nuclei_results.txt
Explanation: This command runs Nuclei against all live hosts, checking for vulnerabilities of all severity levels. Findings can range from exposed debug panels to critical remote code execution flaws.
Step 2: Analyze the Results. Do not blindly submit every Nuclei finding. Manually verify each one to confirm it is a true positive and not a false positive. Understand the context and potential impact of the vulnerability.
- The Human Element: Manual Testing and Logic Flaws
Automated tools cannot find business logic vulnerabilities, complex access control issues, or novel attack chains. This is where your skills as a hacker truly shine. Interact with the application as both a regular user and an administrator would, looking for flaws in the workflow.
Step‑by‑step guide explaining what this does and how to use it.
Step 1: Spider the Application. Use a browser or tool to map all the endpoints and functionality of a web application.
Tool: Use Burp Suite’s built-in spider or OWASP ZAP.
Process: Configure your browser to use Burp Suite as a proxy, then browse the application thoroughly. Burp will capture every request, building a site map for your analysis.
Step 2: Test for Common Web Flaws. Manually test endpoints for vulnerabilities like SQL Injection, Cross-Site Scripting (XSS), and Broken Access Control.
SQL Injection Example: In a parameter like ?id=1, try `?id=1’` to trigger a database error. Then use a tool like SQLmap for further exploitation.
sqlmap -u "https://example.com/page.php?id=1" --batch --level=3
Broken Access Control: Log in as a low-privilege user, access a resource meant for an admin (e.g., /admin/user-list), and see if the application properly blocks you.
What Undercode Say:
- Recon is Not Optional: A broad and deep reconnaissance process is the single biggest differentiator between finding nothing and finding critical bugs. The time invested here has a direct, exponential return.
- Automation is Your Foot Soldier, Not Your General: Use tools to handle the scale, but your brain must guide the process and interpret the results. Manual verification and exploitation are where real hacking happens.
- Analysis: The post from Mohit Negi, while brief, is a microcosm of a successful bug bounty journey. The $100 reward is a tangible outcome of a disciplined process centered on OSINT and Recon. It demonstrates that you don’t need to be a master exploit developer on day one; you need to be thorough, curious, and systematic. The recognition from elite organizations like NASA and Google is a testament to the fact that this methodology uncovers valid, high-impact security risks. This approach democratizes security research, making it accessible to anyone willing to learn the tools and processes. The hashtags recon and osint are not just keywords; they are the foundational pillars of his success.
Prediction:
The future of bug bounty hunting will be dominated by those who can most effectively correlate and weaponize data from disparate OSINT sources. As attack surfaces expand with cloud and IoT, manual reconnaissance will become unsustainable. We will see a rise in AI-powered recon platforms that can automatically discover assets, correlate vulnerabilities from multiple scans, and even suggest potential attack vectors. However, the human hunter’s ability to creatively chain these findings to discover complex business logic flaws will remain an irreplaceable and highly valued skill. The $100 bounty of today, found through methodical recon, is the training ground for the AI-assisted, critical infrastructure discoveries of tomorrow.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Mohit Negi – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
