Document Title: =============== PayPal Inc Bug Bounty Issue #70 France - Persistent (Escape Shopping) Mail Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=869 http://vulnerability-db.com/magazine/articles/2014/09/30/paypal-inc-patched-several-persistent-mail-encoding-vulnerabilities PayPal Security UID: Roc83bl Release Date: ============= 2014-09-25 Vulnerability Laboratory ID (VL-ID): ==================================== 869 Common Vulnerability Scoring System: ==================================== 3.5 Product & Service Introduction: =============================== 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 Vendor Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal] Abstract Advisory Information: ============================== The Vulnerability Laboratory Research Team discovered a mail encoding web vulnerability in the official PayPal Inc France online service web-application Vulnerability Disclosure Timeline: ================================== 2014-09-25: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== PayPal Inc Product: France - Core Application 2013 Q1 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent mail encoding web vulnerability has been discovered in the official PayPal Inc France Web Application Service. The vulnerability allows remote attackers to inject own malicious script code to the application-side of a vulnerable module. The persistent input validation mail encoding web vulnerability is located in the paypal france service application. Remote attacker can inject own script codes to POST method request of the vulnerable `invite a friend by mail` function. The vulnerable input values are name and company. The execution of the malicious injected code occurs in the outgoing invite service mail of the paypal france web-server. The service does not encode the input an transfers the malicious input wrong encoded through the invite service to execute in the mail as output. Remote attacker can tamper the session request (live) via POST to change the vulnerable values or exploit it manually by the form without secure validation or special char input restriction. The security risk of the persistent web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.5. Exploitation of the vulnerability requires no privileged application user account but low or medium user interaction. Successful exploitation of the vulnerability results in persistent phishing , session hijacking, persistent external redirect to malicious sources and persistent manipulation of connected or affected module context. Request Method(s): [+] POST Vulnerable Service(s): [+] PayPal Inc - France Vulnerable Module(s): [+] Escape Shopping - Mail Notification Vulnerable Parameter(s): [+] Name or Company Affected Module(s): [+] Notification Mail (Web Server) [noreply@paypal.fr] Proof of Concept (PoC): ======================= The vulnerability can be exploited by remote attackers with low or medium required user interaction and without privileged application user account. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Code Review: Standard Notification Mail Bonjour Benjamin 337

Damian vous recommande un site vu sur l'Espace Shopping de PayPal : Flipstory

Damian a ajouté ce commentaire :



Cet e-mail a été envoyé par l'intermédiaire de l'Espace Shopping PayPal par une personne estimant que ces informations sont susceptibles de vous intéresser. PayPal décline toute responsabilité quant à l'envoi et au contenu de cet e-mail.

L'équipe PayPal Topic: XXX > vous recommande l'Espace Shopping de PayPal Code Review: Manipulated Notification Mail (Web Server) [noreply@paypal.fr] PoC: Bonjour "><[PERSISTENT INJECTED SCRIPT CODE!]"><&>lt;

Da "><[PERSISTENT INJECTED SCRIPT CODE - PARSED!!]< vous recommande un site vu sur l'Espace Shopping de PayPal : Flipstory Sender Mail: no-reply@paypal.fr Test Account(s): research@vulnerability-lab.com Reference(s): https://www.paypal-france.fr/espace-shopping/les-sites-bons-plans-PayPal/Toutes-les-categories/0/1 Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the name and company input values. Restrict and filter the output of the names that get streamed through the mail service to a customer or client to prevent persistent script code execution attacks. Security Risk: ============== The security risk of the persistent mail encoding (input validation) web vulnerability in the company and name values is estimated as medium. (Cvss 3.5) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com] Disclaimer & Information: ========================= 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. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com Section: dev.vulnerability-db.com - forum.vulnerability-db.com - magazine.vulnerability-db.com Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/ Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission. Copyright © 2014 | Vulnerability Laboratory [Evolution Security] -- VULNERABILITY LABORATORY RESEARCH TEAM DOMAIN: www.vulnerability-lab.com CONTACT: research@vulnerability-lab.com