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Introduction:
The world of bug bounty hunting offers a lucrative and rewarding path for cybersecurity enthusiasts. By ethically probing applications for vulnerabilities, researchers can earn significant rewards while making the digital world safer. This guide provides the essential technical foundation to launch your own successful bug bounty journey.
Learning Objectives:
- Understand the core methodologies and tools used by professional bug bounty hunters.
- Learn and apply over 25 verified commands for reconnaissance, vulnerability scanning, and exploitation.
- Develop a structured approach to target analysis and vulnerability validation.
You Should Know:
1. Passive Reconnaissance with `whois` and `dig`
Before touching a target, gather intelligence passively.
whois example.com dig example.com ANY
Step-by-step guide:
The `whois` command queries databases to retrieve domain registration information, including the owner’s details and name servers. This can reveal the target’s infrastructure and potential related domains. The `dig` command is a versatile DNS lookup utility. Using the `ANY` query, you can retrieve all available DNS records (A, AAAA, MX, TXT, etc.) for a domain. This helps map out the target’s external services and can sometimes uncover subdomains or misconfigurations in DNS entries.
2. Discovering Hidden Subdomains with `amass`
Subdomains often host vulnerable applications.
amass enum -passive -d example.com amass enum -active -d example.com -brute
Step-by-step guide:
Amass is a powerful tool for network mapping and attack surface discovery. The `enum` subcommand performs DNS enumeration. The `-passive` flag collects data from various open-source intelligence (OSINT) sources without sending direct traffic to the target. The `-active` flag enables more intrusive techniques, and `-brute` forces a brute-force attack for subdomain discovery. Always check the program’s scope and rules of engagement before using active scanning.
3. Probing Web Servers with `curl`
Analyze server headers for misconfigurations.
curl -I https://example.com curl -H "X-Forwarded-Host: evil.com" https://example.com
Step-by-step guide:
The `curl -I` command sends a HEAD request to fetch only the HTTP headers of a response. Analyze these for information disclosure (e.g., revealing server versions), missing security headers, or misconfigurations. The second command tests for Host header injection vulnerabilities by injecting a custom `X-Forwarded-Host` header. If the reflected response shows your injected host, it might be vulnerable to web cache poisoning or password reset poisoning.
4. Automated Vulnerability Scanning with `nuclei`
Leverage community-powered templates to find known flaws.
nuclei -u https://example.com -t exposures/apis/ nuclei -u https://example.com -t vulnerabilities/
Step-by-step guide:
Nuclei uses YAML-based templates to perform massive scans for vulnerabilities, misconfigurations, and exposed assets. The `-u` flag specifies the target URL. The `-t` flag allows you to specify a template or directory of templates. Start with the `exposures/apis/` templates to look for accidentally exposed files or API endpoints, then move to the `vulnerabilities/` templates. Always run Nuclei at a controlled rate (-rate-limit flag) to avoid overwhelming the target.
- Analyzing JavaScript for Secrets with `subjs` and `grep`
Client-side JS files are a treasure trove of secrets.subjs -u https://example.com | grep -E "api|key|token|auth"
Step-by-step guide:
The `subjs` tool fetches JavaScript files from a given URL. Its output is piped (|) into grep, a powerful text search utility. The `-E` flag enables extended regular expressions to search for patterns like “api”, “key”, “token”, or “auth”. This quick command can often uncover hardcoded API keys, tokens, or endpoints that were not intended to be public, leading to a critical security finding.
6. Intercepting and Manipulating Traffic with `mitmproxy`
A CLI-based interactive intercepting proxy.
mitmproxy --mode transparent
Step-by-step guide:
Mitmproxy is a console-based interactive man-in-the-middle proxy. The `–mode transparent` flag sets it up for transparent proxying, often used for testing mobile applications. Once running, all HTTP/S traffic from your device is routed through mitmproxy, allowing you to inspect, intercept, modify, and replay requests in real-time. This is crucial for testing business logic flaws, access controls, and the security of state-changing operations.
7. Exploiting a Simple SQL Injection with `sqlmap`
Automate the detection and exploitation of SQLi.
sqlmap -u "https://example.com/page?id=1" --batch --risk=3
Step-by-step guide:
Sqlmap is a legendary tool that automates the process of detecting and exploiting SQL injection flaws. The `-u` flag specifies the target URL. The `–batch` flag runs the tool in non-interactive mode, using default choices. The `–risk` flag (1-3) increases the level of risk of tests performed; level 3 includes OR-based injection tests. Use this command on a parameter you suspect is vulnerable. Always use this only on targets you are authorized to test.
What Undercode Say:
- Methodology Over Tools: Success is 10% tools and 90% methodology. The commands are levers; a hunter’s skill is knowing where and when to push them. A structured approach—recon, mapping, testing, validation—is what separates a one-time find from a consistent bounty earner.
- The Power of Passive: The most impactful recon is often done without sending a single packet to the target. Leveraging OSINT, certificate transparency logs, and historical data builds a target profile that makes active testing far more effective and focused.
The provided LinkedIn post highlights a common entry point: a successful find rewarded with a gift card. This is the result of applied foundational skills, not magic. The trend is moving towards automation handling the broad scans, elevating the hunter’s value to complex business logic, novel vulnerability chaining, and cloud-native flaws. The future hunter will need deeper architectural understanding to find the vulnerabilities machines cannot.
Prediction:
The barrier to entry for bug bounty hunting will continue to lower with the proliferation of powerful, automated tools, flooding programs with low-quality reports. This will simultaneously increase the value of hunters who can demonstrate deep technical expertise and critical thinking. The future will see a sharp divide between script-kiddies and professional hunters, with programs offering substantially larger bounties for complex, critical vulnerabilities that require a profound understanding of underlying architecture and business logic, particularly in AI systems and cloud environments.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: https://lnkd.in/p/dgG2q8Hn – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
