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paypal hack no surveyToday 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.Does PayPal Credit protect me from liability for unauthorized charges?**Yes! PayPal Credit provides “zero fraud liability” protection, the same protection provided by most major credit cards. This means you are not responsible for unauthorized charges. And we verify your identity with top-of-mind information such as your date of birth and the last four digits of your Social Security number, so there’s no account number that can be lost or stolen..*Where else can I use PayPal Credit?**PayPal Credit is available on purchases at thousands of stores that accept PayPal. It’s also available for purchases on eBay and exclusively at thousands of other online stores.*Why should I link my PayPal Credit and PayPal accounts?**Linking your accounts means you’ll be able to use PayPal Credit at most places PayPal is accepted. You can also get six months to pay for your purchases of $99 or more through PayPal Credit - and you could score deals such as free shipping, valuable discounts and promotional offers! By linking, you can also easily manage both accounts—pay your bill, view recent activity, set payment reminders, and much more at PayPal.com.*I have a separate PayPal Credit (formerly Bill Me Later) account. How do I add it to my PayPal account?**It’s easy! There are three ways to link your PayPal Credit and PayPal accounts:*Log in to your PayPal account, click Profile, select “PayPal Credit,” then click Update Preferences.*Click here or enter billmelater.com/linkpaypal into your browser for step-by-step instructions.*The next time you’re checking out with PayPal, just select PayPal Credit as your way to pay.Steps To Create your PayPal account:**First of all head over to PayPal.com and click on to get started to create your PayPal accou

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