Essential Cybersecurity Commands and Techniques for Bug Bounty Hunters and Penetration Testers

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Introduction

Bug bounty hunting and penetration testing require a deep understanding of cybersecurity tools, commands, and techniques. This article covers verified Linux/Windows commands, vulnerability exploitation, and mitigation strategies to help security researchers strengthen their skills.

Learning Objectives

  • Master essential Linux and Windows commands for security assessments.
  • Learn how to identify and exploit common vulnerabilities.
  • Understand mitigation techniques to secure systems.

1. Network Scanning with Nmap

Command:

nmap -sV -A -T4 target.com

Step-by-Step Guide:

1. `-sV`: Enables service version detection.

  1. -A: Enables OS detection, script scanning, and traceroute.

3. `-T4`: Sets aggressive timing for faster scans.

This command helps identify open ports, services, and potential vulnerabilities on a target system.

2. Directory Bruteforcing with Gobuster

Command:

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

Step-by-Step Guide:

1. `dir`: Specifies directory brute-forcing mode.

2. `-u`: Defines the target URL.

3. `-w`: Uses a wordlist (e.g., `common.txt`).

This helps discover hidden directories and files on a web server.

3. Exploiting SQL Injection with SQLmap

Command:

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

Step-by-Step Guide:

1. `-u`: Specifies the vulnerable URL.

2. `–dbs`: Lists available databases.

SQLmap automates SQL injection attacks to extract sensitive data.

4. Windows Privilege Escalation with PowerUp

Command (PowerShell):

Invoke-AllChecks

Step-by-Step Guide:

1. Load PowerUp (`Import-Module PowerUp.ps1`).

2. Run `Invoke-AllChecks` to identify misconfigurations.

This helps find weak permissions, unquoted service paths, and other Windows escalation vectors.

5. Password Cracking with Hashcat

Command:

hashcat -m 1000 hashes.txt rockyou.txt

Step-by-Step Guide:

1. `-m 1000`: Specifies NTLM hash mode.

2. `hashes.txt`: Contains extracted password hashes.

3. `rockyou.txt`: A common wordlist for brute-forcing.

Hashcat is a powerful tool for cracking password hashes.

6. Cloud Security: AWS S3 Bucket Enumeration

Command:

aws s3 ls s3://bucket-name --no-sign-request

Step-by-Step Guide:

  1. aws s3 ls: Lists files in an S3 bucket.

2. `–no-sign-request`: Bypasses authentication if misconfigured.

This checks for publicly accessible S3 buckets, a common cloud misconfiguration.

7. API Security Testing with Postman

Example Request:

GET /api/user?id=1 HTTP/1.1 
Host: target.com 
Authorization: Bearer <token>

Step-by-Step Guide:

  1. Test for broken authentication, IDOR, and rate-limiting issues.

2. Manipulate parameters to check for data leaks.

APIs often expose vulnerabilities due to weak access controls.

What Undercode Say:

  • Key Takeaway 1: Automation tools like Nmap and SQLmap save time but require ethical use.
  • Key Takeaway 2: Cloud misconfigurations (e.g., open S3 buckets) are low-hanging fruit for attackers.

Analysis:

The increasing complexity of web applications and cloud infrastructure demands continuous learning. Bug bounty hunters must stay updated with new attack vectors, such as Web3 vulnerabilities and AI-driven exploits. Future cybersecurity trends will likely focus on AI-powered defense mechanisms and decentralized security models.

By mastering these commands and techniques, security professionals can enhance their offensive and defensive capabilities in an evolving threat landscape.

IT/Security Reporter URL:

Reported By: Trilokdhaked Web – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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