Praetorian503 Posted February 5, 2013 Report Posted February 5, 2013 PayPal.com suffered from a persistent script injection vulnerability.Title:======Paypal Bug Bounty #20 - Persistent Web VulnerabilitiesDate:=====2013-01-25References:===========http://www.vulnerability-lab.com/get_content.php?id=682PayPal UID: fxv444khiVL-ID:=====682Common 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 Paypal Labs Fundraising Widget Web Application.Report-Timeline:================2012-08-13: Researcher Notification & Coordination2012-08-14: Vendor Notification2012-09-13: Vendor Response/Feedback2013-01-12: Vendor Fix/Patch (PayPal Inc)2013-01-25: Public DisclosureStatus:========PublishedExploitation-Technique:=======================RemoteSeverity:=========MediumDetails:========Multiple persistent input validation vulnerabilities are detected in Paypal Labs Fundraising Widget. The bugs allow remote attackers to implement/inject malicious script code on the application side (persistent). The persistent vulnerabilities are located in the Generate Widgets module with the bound vulnerable your name, your website, image url and supporters parameter listing. Attackers can inject own malicious script code as name, website url, image url or as supporter link to generate evil fundraising widgets. The execution of the script code occurs in the main listing out of the account index or the generated widget file output listing.Exploitation requires low user interaction or low privileged application user account. Successful exploitation of the vulnerability leads to persistent session hijacking (admin/mod/customer), account steal via persistent web attack or stable (persistent) context manipulation.Vulnerable Service(s): [+] Fundraising Widgets [https://giving.paypallabs.com/]Vulnerable Module(s): [+] Generate Widgets Vulnerable Parameter(s): [+] your name [+] your website [+] image url [+] supportersAffected Section(s): [+] Giving PaypalLabs Account Index [+] Generated widget output fileProof of Concept:=================The persistent web vulnerabilities can be exploited by remote attackers with low privileged application user account and with low or medium required user inter action. For demonstration or reproduce ...Session: https://giving.paypallabs.com/authenticate/myaccount?token=HA-CYR26UHWRK8CSTime: 17:58 - 18:10 (EU) 2012-08-13Review: Your giving widgets - Account Index<tr><td height="20" width="20"><img src="myaccount-Dateien/spacer.gif" height="1" width="20"></td><td align="left" height="20" valign="top" width="10"><img src="myaccount-Dateien/dot.gif" height="7" width="2"></td><td class="gap" title="-1' " align="left" height="20" width="110"><[PERSISTENT INJECTED SCRIPT CODE!]")' <"=""><ahref="/authenticate/view_campaign?campaign=38284">-1' "><[PERSISTENT INJECTED SCRIPT CODE!]") <</a></td><td width="20" height="20"><img src="/images/spacer.gif" width="20" height="1" /></td></tr>Review: Review Badge - Link<a name='b_60df8340c78b012fbb8a000d60d4c902'></a><object type='application/x-shockwave-flash' data='https://giving.paypallabs.com/flash/badge.swf' width='205' height='350' id='badge60df8340c78b012fbb8a000d60d4c902' align='middle'><param name='allowScriptAccess' value='always' /><param name='allowNetworking' value='all' /><param name='movie' value='https://giving.paypallabs.com/flash/badge.swf' /><param name='quality' value='high' /><param name='bgcolor' value='#FFFFFF' /><param name='wmode' value='transparent' /><param name='FlashVars' value='Id=60df8340c78b012fbb8a000d60d4c902'/><embed src='https://giving.paypallabs.com/flash/badge.swf' FlashVars='Id=60df8340c78b012fbb8a000d60d4c902' quality='high' bgcolor='#FFFFFF' wmode='transparent' width='205' height='350' Id='badge60df8340c78b012fbb8a000d60d4c902' align='middle' allowScriptAccess='always' allowNetworking='all' type='application/x-shockwave-flash' pluginspage='http://www.macromedia.com/go/getflashplayer'></embed></object>Risk:=====The security risk of the persistent script code inject vulnerability is estimated as medium(+).Credits:========Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)Disclaimer:===========The information provided in this advisory is provided as it is without any warranty. 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