Cookie Check: A Chromium-Based Extension for Auditing Cookie Security Flags

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Andre C. has developed a Cookie Check extension for Chromium-based browsers to assess cookie security flags based on predefined metrics. This tool helps users evaluate cookie security configurations, empowering them to take necessary actions to mitigate risks.

Key Features:

  • Analyzes Secure, HttpOnly, SameSite, and other cookie flags.
  • Provides risk assessment based on cookie attributes.
  • Simple, user-friendly interface for quick audits.

🔗 Demo Video: https://lnkd.in/g6BjEd7K
🔗 Download (Test Environment Recommended): https://lnkd.in/gTFjRn3w

You Should Know: Essential Cookie Security Practices

1. Checking Cookie Flags Manually (Browser DevTools)

  • Open Chrome DevTools (F12 or Ctrl+Shift+I).
  • Go to Application → Cookies.
  • Inspect flags like:
    – `Secure` (transmitted only over HTTPS)
    – `HttpOnly` (blocks JavaScript access)
    – `SameSite` (prevents CSRF attacks)

2. Linux Command to Check Cookies in Curl

curl -I --http2 https://example.com | grep -i set-cookie

This retrieves cookie headers from a website.

3. Extracting Cookies via Python (For Security Testing)

import requests

response = requests.get('https://example.com')
cookies = response.cookies
for cookie in cookies:
print(f"Name: {cookie.name}, Secure: {cookie.secure}, HttpOnly: {cookie.has_nonstandard_attr('HttpOnly')}")

Note: Only use for authorized testing.

4. Enforcing Secure Cookies in Apache/Nginx

Apache:

Header edit Set-Cookie ^(.)$ $1;HttpOnly;Secure;SameSite=Strict

Nginx:

add_header Set-Cookie "Path=/; HttpOnly; Secure; SameSite=Strict";

5. Detecting Weak Cookies with Burp Suite

  • Intercept traffic in Burp Proxy.
  • Check Cookie attributes in requests/responses.
  • Use Burp Scanner to detect missing security flags.

6. Windows PowerShell: Checking Browser Cookies

Get-Content "$env:USERPROFILE\AppData\Local\Google\Chrome\User Data\Default\Cookies" | Select-String "session"

Warning: Manual inspection requires SQLite tools.

What Undercode Say

Cookie security is often overlooked, yet it’s critical for preventing session hijacking, CSRF, and data breaches. Tools like Cookie Check simplify auditing, but manual verification remains essential.

Additional Security Commands:

  • Linux: Check active cookies in Firefox: 
    sqlite3 ~/.mozilla/firefox/.default/cookies.sqlite "SELECT name, value FROM moz_cookies"
  • Windows: List Chrome cookies via CLI: 
    type "%LocalAppData%\Google\Chrome\User Data\Default\Cookies" | find "auth"
  • Python Flask (Secure Cookie Example): 
    from flask import Flask, make_response
app = Flask(<strong>name</strong>)
@app.route('/')
def index():
resp = make_response("Cookie Set")
resp.set_cookie('sessionID', 'encrypted_value', secure=True, httponly=True, samesite='Lax')
return resp

Expected Output:

A secure web application enforces Secure, HttpOnly, and `SameSite` flags on all cookies. Automated tools like Cookie Check help, but penetration testers and developers must manually verify configurations.

Prediction

Browser extensions for automated security auditing will grow, integrating AI-based risk scoring for cookies, local storage, and session management. Future versions may include real-time exploit detection.

Expected Output:

A detailed, actionable guide on cookie security with practical commands for developers, admins, and pentesters.

References:

Reported By: Amcamillo I – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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