Netflix account takeover using Google Obscure email vulnerability




 What is Obscure email vulnerability

Obscure email vulnerability in Gmail is interaction between two different ways of handling e-mail addresses which means shaquibdexter@gmail.com would be same as shaquib.dexter@gmail.com and this is also same as dexters.h.a.q.u.i.b@gmail.com. But in case of netflix they don't ignore the dotted part so all of them are unique email address for netflix and each one can be used for registering a new account. So this difference can be exploited .

The phishing part 

  • Try the Netflix signup form until you get a
    gmail.com address which is already registered by some user, for example you find the victim
    shaquibdexter.

  •   Create a Netflix account with address shaquib.dexter

  •   Sign up for free trial with any card no (that card should be throwaway card).

  •   When Netflix applies the active card check, cancel the
    card.

  • Wait for Netflix to bill the cancelled card. Then Netflix
    will emails shaquib.dexter asking for a valid card.

  •   Hope that dexter will read that email to dexter.weesely, thinking it's for
    his Netflix account backed by shaquibdexter, then enters hiscard **4567.

  • Change the email for the Netflix account to new@gmail.com,
    kicking shaquibdexter's access to this account.

  •   Use Netflix free forever with his card **** 4567!

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