How it was found

Summary

Sub domain take over in gratipay.com

Description

I scanned gratipay.com using knockpy to find the sub domains. I found one subdomain 'www.gratipay.com.herokudns.com'. But this sub domain is not registered in heroku. An attacker can buy this sub domain from heroku.

Browsers Verified In

• Firefox
• Chrome

Steps To Reproduce

1. use the 'knockpy gratipay.com' command in knockpy to find sub domains . You will get one domain like 'www.gratipay.com.herokudns.com'.
2. Test this domain in browser. Then you will get error message from heroku. Please refer attached screen shot for more clarity.