PivotX 2.3.11: Code Execution

PivotX 2.3.11: Code Execution

Date: 2016-03-15 13:48:41
Security Advisory – Curesec Research Team

1. Introduction

Affected Product: PivotX 2.3.11
Fixed in: not fixed
Fixed Version Link: n/a
Vendor Website: http://pivotx.net/
Vulnerability Type: Code Execution
Remote Exploitable: Yes
Reported to vendor: 01/20/2016
Disclosed to public: 03/15/2016
Release mode: Full Disclosure
CVE: n/a
Credits Tim Coen of Curesec GmbH

2. Overview

PivotX is a CMS for blogging written in PHP. In version 2.3.11, it is vulnerable to code execution by authenticated users because it does not check the extension of files when renaming them.

3. Details


CVSS: High 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

The file upload functionality checks file extensions when uploading files to prevent the uploading of malicious files such as PHP files. However, the rename function does not check the extension of the new filename, leading to code execution.

An account in the advanced users, admins, or superadmins role is required to upload files.

Proof of Concept

1. Upload an image file containing PHP code with a valid extension such as png 2. rename it so it has a PHP extension: http://localhost/pivotx_latest/pivotx/index.php?page=media&file=imageshell.png&pivotxsession=ovyyn4ob2jc5ym92&answer=shell.php

4. Solution

This issue was not fixed by the vendor.

5. Report Timeline

01/20/2016 Informed Vendor about Issue
01/29/2016 Vendor replies, PivotX is not maintained anymore
03/15/2016 Disclosed to public