Essential Cybersecurity Commands and Techniques for Bug Bounty Hunters

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Introduction

Bug bounty hunting and cybersecurity research require a deep understanding of tools, commands, and vulnerabilities. This article covers essential Linux, Windows, and cybersecurity commands, along with practical exploitation and mitigation techniques used by professionals like Prathmesh Chaudhari, a recognized bug bounty hunter.

Learning Objectives

  • Master critical Linux and Windows commands for security assessments.
  • Learn how to identify and exploit rate-limiting vulnerabilities.
  • Understand defensive techniques to secure APIs and web applications.

You Should Know

1. Identifying Rate-Limit Vulnerabilities

Command:

curl -X POST -d "username=test&password=test" http://example.com/login -H "Content-Type: application/x-www-form-urlencoded"

Step-by-Step Guide:

  • Use `curl` to send repeated login requests to test for rate-limiting.
  • If the server doesn’t block multiple requests, it may be vulnerable to brute-force attacks.
  • Tools like Burp Suite Intruder or OWASP ZAP can automate this testing.

2. Network Scanning with Nmap

Command:

nmap -sV -T4 -p- <target_IP>

Step-by-Step Guide:

– `-sV` detects service versions.
– `-T4` speeds up the scan.
– `-p-` scans all 65,535 ports.
– Use results to identify open ports and potential attack surfaces.

3. Windows Privilege Escalation Check

Command (PowerShell):

whoami /priv

Step-by-Step Guide:

  • Lists privileges of the current user.
  • Look for SeImpersonatePrivilege or SeDebugPrivilege, which can be exploited for escalation.
  • Tools like WinPEAS automate privilege escalation checks.

4. Exploiting No Rate-Limit with Hydra

Command:

hydra -l admin -P rockyou.txt example.com http-post-form "/login:username=^USER^&password=^PASS^:F=incorrect" -t 64

Step-by-Step Guide:

– `-l` specifies the username.
– `-P` uses a password list (e.g., rockyou.txt).
– `http-post-form` defines the login request structure.
– If no rate-limiting exists, Hydra can brute-force credentials.

5. Securing APIs with JWT Hardening

Command (Node.js):

const jwt = require('jsonwebtoken'); 
const token = jwt.sign({ user: 'admin' }, 'strong_secret_key', { expiresIn: '1h' });

Step-by-Step Guide:

  • Always use strong secret keys.
  • Set short expiration times (expiresIn).
  • Validate tokens rigorously on the server side.

6. Cloud Hardening (AWS S3 Bucket)

Command (AWS CLI):

aws s3api put-bucket-policy --bucket my-bucket --policy file://policy.json

Step-by-Step Guide:

  • Ensure the policy denies public access.
  • Example policy.json: 
    { 
"Version": "2012-10-17", 
"Statement": [{ 
"Effect": "Deny", 
"Principal": "", 
"Action": "s3:GetObject", 
"Resource": "arn:aws:s3:::my-bucket/" 
}] 
}

7. Linux Log Analysis for Intrusions

Command:

grep "Failed password" /var/log/auth.log

Step-by-Step Guide:

  • Checks for brute-force attempts.
  • Use Fail2Ban to automatically block malicious IPs.

What Undercode Say

  • Key Takeaway 1: Rate-limiting flaws are low-hanging fruit in bug bounty programs—always test endpoints for brute-force vulnerabilities.
  • Key Takeaway 2: Privilege escalation and misconfigured cloud storage are common in real-world breaches; automate checks to save time.

Analysis:

Bug bounty hunters must balance offensive testing with defensive hardening. Tools like Nmap, Hydra, and JWT are indispensable, but understanding mitigations (e.g., strong bucket policies, rate-limiting) is equally crucial. As APIs and cloud services grow, so do attack surfaces—proactive hardening is non-negotiable.

Prediction

With increasing API-driven architectures, rate-limiting bypasses and JWT flaws will dominate bug reports. Cloud misconfigurations will remain a top risk, pushing demand for automated security tools. Future bounty programs may prioritize AI-driven vulnerability detection, making manual testing more competitive.

IT/Security Reporter URL:

Reported By: Prathmesh Chaudhari – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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