hack paypal sin programasToday I am going to publicly disclose a critical vulnerability I have found during my research in PayPal, This vulnerability enabled me to completely bypass the CSRF Prevention System implemented by PayPal, The vulnerability is patched very fast and PayPal paid me the maximum bounty they give ;).1- Reusable CSRF Token:
The CSRF token “that authenticate every single request made by the user” which can be also found in the request body of every request with the parameter name “Auth” get changed with every request made by user for security measures, but after a deep investigation I found out that the CSRF Auth is Reusable for that specific user email address or username, this means If an attacker found any of these CSRF Tokens, He can then make actions in the behalf of any logged in user.
Hmm, it seems interesting but still not exploitable, as there is no way for an attacker to get the “Auth” value from a victim session.
2- Bypassing the CSRF Auth System:
The CSRF Auth verifies every single request of that user, So what If an attacker “not logged in” tries to make a “send money” request then PayPal will ask the attacker to provide his email and password, The attacker will provide the “Victim Email” and ANY password, Then he will capture the request, The request will contain a Valid CSRF Auth token Which is Reusable and Can authorise this specific user requests. Upon Further Investigation, We have found out that an Attacker can obtain the CSRF Auth which can be valid for ALL users, by intercepting the POST request from a page that provide an Auth Token before the Logging-in process, check this page for the magical CSRF Auth “”. At this point the attacker Can CSRF “almost” any request on behalf of this user.
Through examination of the password change process, I have found that an attacker can NOT Change the victim password without answering the Security Questions set by user, Also the user himself can NOT change the security questions without entering the password!
3- ByPassing the Security Questions Change:
Screen Shot 2014-08-13 at 12.20.52 AM
The initial process of “setting” security questions is not password protected and is reusable
After further investigation, I have noticed that the request of setting up the security questions “which is initiated by the user while signing up” is not password-protected, and it can be reused to reset the security questions up without providing the password, hence, Armed with the CSRF Auth, an attacker can CSRF this process too and change the victim’s Security questions.
At this point, An attacker can conduct a targeted CSRF attack against PayPal users and take a full control over their accounts. Hence, An attacker can CSRF all the requests including but not limited to:
1- Add/Remove/Confirm Email address
2-Add fully privileged users to business account
3- Change Security questions
4- Change Billing/Shipping Address
5- Change Payment methods
6- Change user settings(Notifications/Mobile settings) ………… and more.
To automate the whole process, I have coded a Python interactive server to demonstrate how an attacker can exploit this vulnerability in a real-life scenario attack.The PayPal app is available online or at the iTunes App Store and Google Play. One year after acquiring Braintree, PayPal introduced its "One Touch" service, which allows users to pay with a one-touch option on participating merchants websites or apps.[69]
On November 28, 2011, PayPal reported Black Friday brought record mobile engagement including a 538% increase in global mobile payment volume when compared with Black Friday 2010.[70]
In 2012, the company launched "PayPal Here," a small business mobile payment system that includes a combination of a free mobile app and a small card-reader that plugs into a smart phone.[71]
PayPal launched an updated app for iOS and Android in 2013 that expanded its mobile app capabilities by allowing users to search for local shops and restaurants that accept PayPal payments, order ahead at participating venues, and access their PayPal Credit accounts (formerly known as Bill Me Later).[67]
Business model evolution[edit]
PayPal"s success in users and volumes was the product of a three-phase strategy described by former eBay CEO Meg Whitman: "First, PayPal focused on expanding its service among eBay users in the US. Second, we began expanding PayPal to eBay"s international sites. And third, we started to build PayPal"s business off eBay."PayPal MyCash Reloadable Card Embezzlement[edit]
PayPal MyCash (PPMC) cards are purchased and loaded at retail and pharmacy stores in the US. These cards are provided by the corporation InComm. Funds can only be loaded to PayPal accounts, and are done so by scratching off silvering on the rear of the card to reveal a secure PIN. It has been discovered that these
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