Paypal- Privilege Escalation Vulnerability [Delete Any User]

Vulnerability Type: Privilege Escalation

Vulnerable Website: https://www.paypal-labs.com

Status: Fixed

Vulnerability Overview: This vulnerability allowed an attacker to delete any user registered in paypal-labs.com.

Details/Write-up: 

I forgot to take screenshots but I am sure my detail write-up will clear everything.

First of all I registered here-

 https://www.paypal-labs.com/loginwithpaypal/

I had to login with my own Paypal account and then set the username. For e.g. sehgal

So, my account page was- 

https://www.paypal-labs.com/loginwithpaypal/sehgal

Then after heading to account settings page, I found that there was a option to delete our own account.

Deletion link of my account was-

https://www.paypal-labs.com/loginwithpaypal/sehgal/delete-user.php?id=2134

where "2134" was my User-ID.

I tried to change the "2134" value to someone's else User-ID and sent the request.

Arghh! Error.. I was unable to delete it. Nevermind, no token was passed while request.



Cheers! Found CSRF. But THAT'S NOT MUCH EFFECTIVE.

So, I continued testing and came with very cool link. :)

Remember my deletion link? 

It was- 
https://www.paypal-labs.com/loginwithpaypal/sehgal/delete-user.php?id=2134

I tried to modify URL a bit. Put "admin" in place of my username. I tried to delete the user with User-ID 2145. Final link becomes like this-

https://www.paypal-labs.com/loginwithpaypal/admin/delete-user.php?id=2145

BOOM! User got deleted. Edit URL and change "id" attribute to any USER-ID and it will delete the user without any verification.



Paypal rewarded me with 2000$ for reporting this vulnerability.


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