So,this story is all about how I was able to Bypass Scratch Cards On Google Pay .
As you all know Google offers scratch cards as a reward for using their payment system Google Pay. Recently,they had rolled out scratch cards for inviting friends for joining Google Duo.Once a person sign-up for the service,you get a scratch card on your Google Pay.You can get upto 30 cards during the offer period.
About the bug..
I don’t consider myself as an expert in security field.Nonetheless,I hope this report might help you at some point of time.
As said,you could earn rewards for inviting friends to try out Google Duo.As per the T&C of the offer,this is supposed to work with only Indian Users who signs-up with a +91 mobile number and have a valid email address linked to the Google Pay application.Both you and the person joining via your link must have Google Pay account for this offer to work.
Interestingly,I found that the offer can be bypassed by a user by using Virtual Numbers which can be generated easily by using applications like Text Now,2nd Line etc…
So,How Did I earn 30 scratch cards without referring anyone?
1… Create a Valid Google Duo Account and generate an invite link.
2.. Delete Data of the google duo application.
3… Use the previously generated link to sign-up for the Duo application using the virtual number.Note that using virtual numbers should have been made the offer unavailable,But this seemed to work.
4… Sign up using the virtual number and link your own Google Pay account to this account. Note that you are not allowed to link multiple Duo accounts to the same Google Pay account,but in this scenerio,this too seemed to work.
5… You can repeat this process upto 30 times to earn 30 scratch cards.All this by using virtual numbers and your own Google Pay account.
Few days after sending the report,I was surprised to see many tutorials on Youtube by random creators exploiting the same vulnerability.So I knew I was not the only person who was aware of this issue.As expected my report to VRP team was a duplicate.
That’s all for this report.Thanks for your time here :)