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Paypal Bug Bounty #31 - Mail Encoding Web Vulnerability

2013-04-03T00:00:00

ID VULNERLAB:706
Type vulnerlab
Reporter Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)
Modified 2013-04-03T00:00:00

Description

                                        
                                            Document Title:
===============
Paypal Bug Bounty #31 - Mail Encoding Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=706

PayPal Security UID:  erc849qoz


Release Date:
=============
2013-04-03


Vulnerability Laboratory ID (VL-ID):
====================================
706


Common Vulnerability Scoring System:
====================================
6.3


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 Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal]


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent web vulnerability in the official PayPal Community Forum website application.


Vulnerability Disclosure Timeline:
==================================
2012-09-23:	Researcher Notification & Coordination
2012-09-25:	Vendor Notification
2012-10-01:	Vendor Response/Feedback
2013-03-26:	Vendor Fix/Patch
2012-04-04:	Public Disclosure


Discovery Status:
=================
Published


Affected Product(s):
====================
PayPal Inc
Product: Community (Forums) 2012 Q3


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
A persistent web vulnerabilities is detected in the official PayPal Community Forum website application.

The vulnerability is located in the not secure parsed Problem Reporter module when processing to request 
a manipulated message body or title parameter. The vulnerability affects the outgoing forum.paypal mail 
service of the community and allows the execution of persistent script code. 

Successful exploitation of the vulnerabilities result in persistent phishing mails, persistent session 
hijacking attacks and persistent mail web context manipulation via paypal.

Vulnerable Section(s):
				[+] PayPal Community (Forum) - Problem Reporter
Vulnerable Module(s):
				[+] Problem Reporter of the Community & Forum
Vulnerable Parameter(s):
				[+] Message Body & Title
Affected Module(s):
				[+] Notification Mail - Forum Administrator


Proof of Concept (PoC):
=======================
The persistent vulnerability can be exploited by remote attacker without privileged user account & with low or medium 
required user interaction. For demonstration or reproduce ...


Review:  Notification Mail - Message Body & Title

ID: (KMM65736123V9119L0KM) :ppk1

URL(s): 			https://www.paypal-community.com/t5/US-PayPal-Community/ct-p/US



Solution - Fix & Patch:
=======================
The vulnerability can be patched by parsing the vulnerable message values.
Parse the outgoing mails message body & title or maybe the full template with all later available values.

2013-03-26:	Vendor Fix/Patch by PayPal Inc


Security Risk:
==============
The security risk of the two persistent input validation vulnerability is estimated as high(-).
The vulnerability did not affect the user or customer it affects directly the forum admin or moderators.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@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.vulnerability-lab.com/register
Contact:    admin@vulnerability-lab.com 	- support@vulnerability-lab.com 	       - research@vulnerability-lab.com
Section:    video.vulnerability-lab.com 	- forum.vulnerability-lab.com 		       - news.vulnerability-lab.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

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, sourcecode, 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 support@vulnerability-lab.com) to get a permission.

    				   	Copyright © 2013 | Vulnerability Laboratory

JSON Vulners Source

Initial Source

{"href": "http://www.vulnerability-lab.com/get_content.php?id=706", "sourceData": "Document Title:\r\n===============\r\nPaypal Bug Bounty #31 - Mail Encoding Web Vulnerability\r\n\r\n\r\nReferences (Source):\r\n====================\r\nhttp://www.vulnerability-lab.com/get_content.php?id=706\r\n\r\nPayPal Security UID: erc849qoz\r\n\r\n\r\nRelease Date:\r\n=============\r\n2013-04-03\r\n\r\n\r\nVulnerability Laboratory ID (VL-ID):\r\n====================================\r\n706\r\n\r\n\r\nCommon Vulnerability Scoring System:\r\n====================================\r\n6.3\r\n\r\n\r\nProduct & Service Introduction:\r\n===============================\r\nPayPal is a global e-commerce business allowing payments and money transfers to be made through the Internet. Online money \r\ntransfers serve as electronic alternatives to paying with traditional paper methods, such as checks and money orders. Originally, \r\na 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 \r\ntime in 2010 or early 2011, PayPal began to require a verified bank account after the account holder exceeded a predetermined \r\nspending limit. After that point, PayPal will attempt to take funds for a purchase from funding sources according to a specified \r\nfunding hierarchy. If you set one of the funding sources as Primary, it will default to that, within that level of the hierarchy \r\n(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 \r\nPayPal balance, before it attempts to charge your credit card). The funding hierarchy is a balance in the PayPal account; a \r\nPayPal credit account, PayPal Extras, PayPal SmartConnect, PayPal Extras Master Card or Bill Me Later (if selected as primary \r\nfunding source) (It can bypass the Balance); a verified bank account; other funding sources, such as non-PayPal credit cards.\r\nThe recipient of a PayPal transfer can either request a check from PayPal, establish their own PayPal deposit account or request \r\na transfer to their bank account.\r\n\r\nPayPal is an acquirer, performing payment processing for online vendors, auction sites, and other commercial users, for which it \r\ncharges a fee. It may also charge a fee for receiving money, proportional to the amount received. The fees depend on the currency \r\nused, the payment option used, the country of the sender, the country of the recipient, the amount sent and the recipient s account \r\ntype. In addition, eBay purchases made by credit card through PayPal may incur extra fees if the buyer and seller use different currencies.\r\n\r\nOn October 3, 2002, PayPal became a wholly owned subsidiary of eBay. Its corporate headquarters are in San Jose, California, United \r\nStates at eBay s North First Street satellite office campus. The company also has significant operations in Omaha, Nebraska, Scottsdale, \r\nArizona, and Austin, Texas, in the United States, Chennai, Dublin, Kleinmachnow (near Berlin) and Tel Aviv. As of July 2007, across \r\nEurope, PayPal also operates as a Luxembourg-based bank.\r\n\r\nOn March 17, 2010, PayPal entered into an agreement with China UnionPay (CUP), China s bankcard association, to allow Chinese consumers \r\nto use PayPal to shop online.PayPal is planning to expand its workforce in Asia to 2,000 by the end of the year 2010.\r\nBetween December 4\u00f19, 2010, PayPal services were attacked in a series of denial-of-service attacks organized by Anonymous in retaliation \r\nfor PayPal s decision to freeze the account of WikiLeaks citing terms of use violations over the publication of leaked US diplomatic cables.\r\n\r\n(Copy of the Homepage: www.paypal.com) [http://en.wikipedia.org/wiki/PayPal]\r\n\r\n\r\nAbstract Advisory Information:\r\n==============================\r\nThe Vulnerability Laboratory Research Team discovered a persistent web vulnerability in the official PayPal Community Forum website application.\r\n\r\n\r\nVulnerability Disclosure Timeline:\r\n==================================\r\n2012-09-23:\tResearcher Notification & Coordination\r\n2012-09-25:\tVendor Notification\r\n2012-10-01:\tVendor Response/Feedback\r\n2013-03-26:\tVendor Fix/Patch\r\n2012-04-04:\tPublic Disclosure\r\n\r\n\r\nDiscovery Status:\r\n=================\r\nPublished\r\n\r\n\r\nAffected Product(s):\r\n====================\r\nPayPal Inc\r\nProduct: Community (Forums) 2012 Q3\r\n\r\n\r\nExploitation Technique:\r\n=======================\r\nRemote\r\n\r\n\r\nSeverity Level:\r\n===============\r\nMedium\r\n\r\n\r\nTechnical Details & Description:\r\n================================\r\nA persistent web vulnerabilities is detected in the official PayPal Community Forum website application.\r\n\r\nThe vulnerability is located in the not secure parsed Problem Reporter module when processing to request \r\na manipulated message body or title parameter. The vulnerability affects the outgoing forum.paypal mail \r\nservice of the community and allows the execution of persistent script code. \r\n\r\nSuccessful exploitation of the vulnerabilities result in persistent phishing mails, persistent session \r\nhijacking attacks and persistent mail web context manipulation via paypal.\r\n\r\nVulnerable Section(s):\r\n\t\t\t\t[+] PayPal Community (Forum) - Problem Reporter\r\nVulnerable Module(s):\r\n\t\t\t\t[+] Problem Reporter of the Community & Forum\r\nVulnerable Parameter(s):\r\n\t\t\t\t[+] Message Body & Title\r\nAffected Module(s):\r\n\t\t\t\t[+] Notification Mail - Forum Administrator\r\n\r\n\r\nProof of Concept (PoC):\r\n=======================\r\nThe persistent vulnerability can be exploited by remote attacker without privileged user account & with low or medium \r\nrequired user interaction. For demonstration or reproduce ...\r\n\r\n\r\nReview: Notification Mail - Message Body & Title\r\n\r\nID: (KMM65736123V9119L0KM) :ppk1\r\n\r\nURL(s): \t\t\thttps://www.paypal-community.com/t5/US-PayPal-Community/ct-p/US\r\n\r\n\r\n\r\nSolution - Fix & Patch:\r\n=======================\r\nThe vulnerability can be patched by parsing the vulnerable message values.\r\nParse the outgoing mails message body & title or maybe the full template with all later available values.\r\n\r\n2013-03-26:\tVendor Fix/Patch by PayPal Inc\r\n\r\n\r\nSecurity Risk:\r\n==============\r\nThe security risk of the two persistent input validation vulnerability is estimated as high(-).\r\nThe vulnerability did not affect the user or customer it affects directly the forum admin or moderators.\r\n\r\n\r\nCredits & Authors:\r\n==================\r\nVulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)\r\n\r\n\r\nDisclaimer & Information:\r\n=========================\r\nThe information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, \r\neither expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-\r\nLab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business \r\nprofits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some \r\nstates do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation \r\nmay not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases \r\nor trade with fraud/stolen material.\r\n\r\nDomains: www.vulnerability-lab.com \t- www.vuln-lab.com\t\t\t - www.vulnerability-lab.com/register\r\nContact: admin@vulnerability-lab.com \t- support@vulnerability-lab.com \t - research@vulnerability-lab.com\r\nSection: video.vulnerability-lab.com \t- forum.vulnerability-lab.com \t\t - news.vulnerability-lab.com\r\nSocial:\t twitter.com/#!/vuln_lab \t\t- facebook.com/VulnerabilityLab \t - youtube.com/user/vulnerability0lab\r\nFeeds:\t vulnerability-lab.com/rss/rss.php\t- vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php\r\n\r\nAny modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. \r\nPermission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other \r\nmedia, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, sourcecode, videos and \r\nother information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), \r\nmodify, use or edit our material contact (admin@vulnerability-lab.com or support@vulnerability-lab.com) to get a permission.\r\n\r\n \t\t\t\t \tCopyright \u00a9 2013 | Vulnerability Laboratory\r\n\r\n\r\n\r\n", "bulletinFamily": "exploit", "modified": "2013-04-03T00:00:00", "title": "Paypal Bug Bounty #31 - Mail Encoding Web Vulnerability", "cvss": {"vector": "NONE", "score": 0.0}, "cvelist": [], "description": "", "viewCount": 4, "published": "2013-04-03T00:00:00", "edition": 3, "id": "VULNERLAB:706", "type": "vulnerlab", "lastseen": "2019-07-10T16:42:11", "reporter": "Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)", "enchantments": {"dependencies": {"references": [], "modified": "2019-07-10T16:42:11", "rev": 2}, "score": {"value": 0.1, "vector": "NONE", "modified": "2019-07-10T16:42:11", "rev": 2}, "vulnersScore": 0.1}, "references": [], "scheme": null}