hack paypal limited accountToday 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.Early history[edit]*PayPal was established in December 1998 as Confinity,[13] a company that developed security software for handheld devices[14] founded by Max Levchin, Peter Thiel, Luke Nosek and Ken Howery.[13][15] PayPal was developed and launched as a money transfer service at Confinity in 1999, funded by John Malloy from BlueRun Ventures.[16][17]**In March 2000, Confinity merged with X.com, an online banking company founded by Elon Musk.[18] Musk was optimistic about the future success of the money transfer business Confinity was developing.[19] Musk and then-president and CEO of X.com, Bill Harris, disagreed on this point and Harris left the company in May 2000.[19] In October of that year, Musk made the decision that X.com would terminate its other Internet banking operations and focus on the PayPal money service.[20] The X.com company was then renamed PayPal in 2001,[21] and expanded rapidly throughout the year until company executives decided to take PayPal public in 2002.[15][22] Paypal's IPO listed under the ticker PYPL at $13 per share and ended up generating over $61 millionCriticism[edit]*See also: Criticism of eBay*In 2003, PayPal voluntarily ceased serving as a payment intermediary between gambling websites and their online customers. At the time of this cessation it was the largest payment processor for online gambling transactions. In 2010, PayPal resumed accepting such transactions, but only in those countries where online gambling is legal, and only for sites which are properly licensed to operate in said jurisdictions.[113]**If an account is subject to fraud or unauthorized use, PayPal puts the "Limited Access" designation on the account. PayPal has had several notable cases in which the company h
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