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موضوع: Paypal.com Blind SQL Injection

  1. #1


    تاریخ عضویت
    May 2010
    محل سکونت
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    پیش فرض Paypal.com Blind SQL Injection

    Click here to enlarge
    Title:
    ======
    Paypal Bug Bounty #18 - Blind SQL Injection Vulnerability


    Date:
    =====
    2013-01-22


    References:
    ===========
    http://www.vulnerability-lab.com/get_content.php?id=673

    http://news.softpedia.com/news/PayPa...Experts-323053
    .shtml


    VL-ID:
    =====
    673


    Common Vulnerability Scoring System:
    ====================================
    8.3


    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:
    =========
    The Vulnerability Laboratory Research Team discovered a critical Web Vulnerability in the official Paypal ecommerce
    website application.


    Report-Timeline:
    ================
    2012-08-01: Researcher Notification & Coordination
    2012-08-01: Vendor Notification
    2012-08-07: Vendor Response/Feedback #1
    2012-08-07: Vendor Response/Feedback #2
    2012-12-04: Vendor Response/Feedback #3
    2013-01-12: Vendor Fix/Patch
    2013-01-22: Public Disclosure


    Status:
    ========
    Published


    Affected Products:
    ==================
    PayPal Inc
    Product: Core Application 2012 Q4


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


    Severity:
    =========
    Critical


    Details:
    ========
    A blind SQL Injection vulnerability is detected in the official Paypal ecommerce website application.
    The vulnerability allows remote attackers or local low privileged application user account to inject/execute
    (blind) own sql commands on the affected application dbms. The vulnerability is located in the Confirm
    Email module with the bound vulnerable id input field.

    The validation of the confirm number input field is watching all the context since the first valid number matches.
    The attacker uses a valid number and includes the statement after it to let both pass through the paypal application
    filter. The result is the successful execution of the sql command when the module is processing to reload the page
    module.

    Exploitation of the vulnerability requires a low privileged application user account to access the website area and can

    processed without user interaction. Successful exploitation of the vulnerability results in web application or module
    compromise via blind sql injection attack.

    Vulnerable Service(s):
    [+] Paypal Inc - Core Application (www.paypal.com)

    Vulnerable Module(s):
    [+] Confirm Email

    Vulnerable Section(s):
    [+] Confirm Number (Verification) - Input Field

    Vulnerable Parameter(s):
    [+] login_confirm_number_id - login_confirm_number


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

    URL1: Request a Session with 2 different mails (Step1)
    https://www.paypal.com/de/ece/cn=060...iliuty-lab.com
    https://www.paypal.com/de/ece/cn=060...445***********

    URL2: Injection into ID Confirm Field (Step2)
    https://www.paypal.com/de/cgi-bin/we...ssword-submit&
    dispatch=5885d80a13c0db1f8e263663d3faee8d7283e7f01 84a5674430f290db9e9c846

    1. Open the website of paypal and login as standard user with a restricted account
    2. Switch to the webscr > Confirm Email module of the application
    3. Request a login confirm id when processing to load a reset
    4. Take the valid confirm number of the mail and insert it into the email confirm number verification module input
    fields
    5. Switch to the last char of the valid confirm number in the input field and inject own sql commands as check to proof
    the validation

    Test Strings:
    -1+AND+IF(SUBSTRING(VERSION(),1,1)=$i,1,2)=1-1'
    -1'+AND+IF(SUBSTRING(VERSION(),1,1)=$i,1,2)=1--1'
    1+AND+IF(SUBSTRING(VERSION(),1,1)=$i,1,2)=1
    1+AND+IF(SUBSTRING(VERSION(),1,1)=$i,1,2)=-1'

    6. Normally the website with the generated ID confirm button is bound to the standard template.
    7. Inject substrings with the id -1+sql-query to proof for blind injections in the input field
    8. The bottom bar gets loaded as result for the successful executed sql query
    8. Now, the remote attacker can manipulate the paypal core database with a valid confirm number + his own sql commands

    Bug Type: Blind SQL INJECTION [POST] Injection Vulnerability
    SESSION: DE - 22:50 -23:15 (paypal.com)
    Browser: Mozilla Firefox 14.01

    PoC:
    <form method="post" action="https://www.paypal.com/de/cgi-bin/we...-email-submit&
    dispatch=5885d80a13c0db1f8e263663d3faee8d7283e7f01 84a5674430f290db9e9c846" class="">
    <p class="group"><label for="login_confirm_number_id"><span
    class="labelText"><span class="error">
    Please enter it here</span></span></label><span class="field"><input
    id="login_confirm_number_id" class="xlarge"
    name="login_confirm_number" value="06021484023174514599-1+[BLIND SQL-INJECTION!]--"
    type="text"></span></p><p class="buttons">
    <input name="confirm.x" value="Confirm" class="button primary"
    type="submit"></p><input name="form_charset"
    value="UTF-8" type="hidden"></form>

    Note: Do all requests ever with id to reproduce the issue. (-) is not possible as first char of the input request.

    Example(Wrong): -1+[SQL-Injection]&06021484023183514599
    Example(Right): 06021484023183514599-1+[SQL-Injection]--
    Example(Right): 06021484023183514599-1+AND+IF(SUBSTRING(VERSION(),1,1)=$i,1,2)=1-1'-1'--

    Test Mail(s):
    [+] 01x221*********** and admin@vulnerability-lab.com


    Note:
    After inject was successful 2 times because of my check, the paypal website opened a security issue report message box
    as exception-handling.
    I included the details and information of my test and explained the issue and short time later it has been patched.


    Solution:
    =========
    2013-01-12: Vendor Fix/Patch


    Risk:
    =====
    The security risk of the blind sql injection web vulnerability in the paypal core application is estimated as critical.


    Credits:
    ========
    Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)


    Disclaimer:
    ===========
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    either expressed or implied, including the warranties of merchantability and capability for a particular purpose.
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    or trade with fraud/stolen material.

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  2. نمایش تمام تشکر های حامد کیانمهر در این پست:

    شهریار (26th January 2013)

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