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Introduction:
Bug bounty hunting is a competitive yet rewarding field where persistence and technical skill lead to financial rewards. Mohamed Ashraf’s recent success in triaging a vulnerability for a top-tier company highlights the importance of avoiding duplicates and mastering reconnaissance. This guide dives into essential techniques, tools, and commands to help you transition from “informative” reports to paid bounties.
Learning Objectives:
- Master reconnaissance and target scoping to avoid duplicate submissions.
- Leverage automated and manual testing techniques for high-impact vulnerabilities.
- Understand triage processes on platforms like HackerOne and Bugcrowd.
You Should Know:
1. Effective Reconnaissance with Subdomain Enumeration
Command (Linux):
subfinder -d target.com -o subdomains.txt && httpx -l subdomains.txt -status-code -title -tech-detect -o live_subdomains.txt
What It Does:
– `subfinder` discovers subdomains, while `httpx` filters live ones with HTTP status codes and technologies.
Steps:
1. Install tools via `go install github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest`.
- Run the command, then manually inspect `live_subdomains.txt` for overlooked endpoints.
2. Identifying Hidden Parameters for Injection Flaws
Command (Linux):
arjun -u https://target.com/api/v1/user --get --include='id,token'
What It Does:
- Arjun brute-forces API parameters vulnerable to SQLi or IDOR.
Steps:
1. Install with `pip3 install arjun`.
- Test endpoints for unauthorized data access using discovered parameters like
?id=1234.
3. Automating XSS Detection with Dalfox
Command (Linux):
echo 'https://target.com/search?q=test' | dalfox pipe --skip-bav --skip-grepping
What It Does:
- Scans for reflected XSS by injecting payloads into query parameters.
Steps:
1. Download Dalfox: `go install github.com/hahwul/dalfox/v2@latest`.
- Pipe URLs from recon tools for rapid testing.
4. Exploiting Misconfigured AWS S3 Buckets
Command (Linux):
aws s3 ls s3://bucket-name --no-sign-request
What It Does:
- Checks for publicly readable S3 buckets.
Steps:
- Use `s3scanner` (
go install github.com/sa7mon/s3scanner@latest) to find buckets. - If `–no-sign-request` works, report as an unauthenticated data exposure.
5. Bypassing Rate Limits for Brute-Force Testing
Command (Windows PowerShell):
1..100 | % { Invoke-WebRequest -Uri "https://target.com/[email protected]" -Proxy "http://localhost:8080" }
What It Does:
- Tests rate-limiting flaws by sending repeated requests through Burp Suite.
Steps:
- Capture a request in Burp, then modify and replay it.
- If the endpoint doesn’t block IPs, report weak rate limiting.
6. Detecting CORS Misconfigurations
Command (Browser Console):
fetch('https://api.target.com/data', {
method: 'GET',
headers: { 'Origin': 'https://evil.com' },
credentials: 'include'
}).then(r => r.json()).then(console.log)
What It Does:
- Checks if the API allows cross-origin requests with credentials.
Steps:
- Run in Chrome DevTools. If data leaks, report as a CORS flaw.
7. Mitigating Duplicate Reports with Automated Scanners
Tool Setup:
nuclei -u https://target.com -t ~/nuclei-templates/
What It Does:
- Runs 1,500+ prebuilt vulnerability checks (e.g., CVEs, misconfigurations).
Steps:
1. Update templates: `nuclei -update-templates`.
- Cross-reference findings with existing reports to avoid duplicates.
What Undercode Say:
- Key Takeaway 1: Automation (e.g., Nuclei, Dalfox) reduces duplicates by filtering low-hanging fruit.
- Key Takeaway 2: Manual testing (e.g., parameter fuzzing, CORS checks) uncovers logic flaws automation misses.
Analysis:
Ashraf’s success stems from balancing automation with deep manual analysis. Platforms like Bugcrowd prioritize unique, high-impact bugs—so focus on less-scrutinized endpoints (APIs, subdomains) and document repro steps meticulously.
Prediction:
As bug bounty programs grow, triage will rely more on AI-powered deduplication. Hunters must adapt by targeting complex vulnerabilities (e.g., business logic flaws, SSRF chaining) to stay profitable.
Final Word: Persistence pays. Sharpen your recon game, automate wisely, and always read program scopes to avoid “informative” purgatory. Happy hunting!
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Mohamed Ashraf – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
