Matt Posted July 7, 2013 Report Posted July 7, 2013 Description : PayPal QR Labs service web application suffers from an authentication bypass vulnerability.Author : Cernica Ionut Cosmin from Romanian Security Center ( Felicitari ! ) mah_oneSource : PayPal QR Labs Authentication Bypass ? Packet Storm Code : Title:======Paypal Bug Bounty #102 QR Dev Labs - Auth Bypass VulnerabilityDate:=====2013-07-05References:===========http://www.vulnerability-lab.com/get_content.php?id=995PayPal Security UID: ZVf25kCVL-ID:=====995Common Vulnerability Scoring System:====================================7.1Introduction:=============Shopping made easy with PayPal QR enabled on your mobile device. You can scan for deals using the QR Code displayed in shops, trains stations, bus-stops & banners and purchase items in just a few taps. Make shopping experience easy for your customer.(Copy of the Vendor Homepage: https://qr.paypal-labs.com )Abstract:=========An independent vulnerability laboratory researcher discovered an auth bypass web session vulnerability in the PayPal QR Labs Service Web Application.Report-Timeline:================2012-05-11: Researcher Notification & Coordination (Cernica Ionut)2013-05-14: Vendor Notification (PayPal Inc Security Incident Team - Bug Bounty Program)2013-06-20: Vendor Fix/Patch (PayPal Inc Developer Team)2013-07-05: Public Disclosure (Vulnerability Laboratory)Status:========PublishedAffected Products:==================PayPal IncProduct: QR Labs Online Service - Web Application 2013 Q2Exploitation-Technique:=======================RemoteSeverity:=========HighDetails:========An auth bypass session web vulnerability is detected in the official PayPal QR Labs Service Web Application.The vulnerability allows remote attackers to bypass the web- or system user auth of the affected vulnerable computer system to compromise paypal accounts.The bug is located in the application account login module when processing to load manipulated j_password parameters via GET method. Attackers are able the decrypt and exchange the information in the request live with a session tamper to take-over other accounts. At the end the vulnerability allows remote attackers to enter remotely any paypal qr labs account of the web application.Exploitation of the vulnerability does not require user interaction but a low privileged paypal qr labs application user account. Successful exploitation results in account steal or compromise and stable user session manipulation with different effects.Vulnerable Service(s): [+] PayPal Inc – qr.paypal-labs.comVulnerable Module(s): [+] Account - LoginVulnerable Parameter(s): [+] j_passwordAffected Module(s): [+] Account SystemProof of Concept:=================The vulnerability can be exploited by remote attackers with low privilege paypal qr labs application user account and without user interaction. For demonstration or reproduce ...Note:After some security checks to authenticate in the qr.paypal-labs.com web application, the last request for being authenticate in this web application it is not secure implemented.Afected Link:https://qr.paypal-labs.com/j_security_check?j_username=loger177@gmail.com&j_password=96301aa9f02b5d12278b0e902dc5434ed9477d19Note:If we look at the request wich is a GET method request we will soon see ...If we encrypt the j_username parameter value as SHA1 ... The result will be the value of the j_password parameterNote: PoC VideoThe username loger177@gmail.com is encrypted in SHA1 it is equals with < 96301aa9f02b5d12278b0e902dc5434ed9477d19In the demonstration above it seems that the password of the username is encrypted in SHA1 Solution:=========2013-06-20: Vendor Fix/Patch (PayPal Inc Developer Team)Risk:=====The security risk of the auth bypass web session vulnerability is estimated as high(+).Credits:========Independent Security Researcher – Cernica Ionut Cosmin (ionut.cernica@whit3hat.com)Disclaimer:===========The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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mah_one Posted July 8, 2013 Report Posted July 8, 2013 (edited) Astazi am primit si restul de bani, am luat in total 1250$ pe aceasta problema.Daca cei de la paypal sunt seriosi, vor mai urma si altele foarte interesante, doua auth bypass. Edited July 8, 2013 by mah_one Quote
