I would like to disclose CSRF and stored XSS vulnerability in Wordpress plugin LeenkMe version 2.5.0. The plugin can be found at https://wordpress.org/plugins/leenkme/ In the page wp-content/plugins/leenkme/facebook.php XSS vulnerable Fields are : - facebook_message - facebook_linkname - facebook_caption - facebook_description - default_image - _wp_http_referer This CSRF is tested on latest wordpress installation 4.4.2 using firefox browser. The Code for CSRF.html is The vulnerable page is wp-content/plugins/leenkme/facebook.php The vulnerable code producing XSS is if ( !empty( $_REQUEST['facebook_message'] ) ) $user_settings['facebook_message'] = $_REQUEST['facebook_message']; else $user_settings['facebook_message'] = ''; if ( !empty( $_REQUEST['facebook_linkname'] ) ) $user_settings['facebook_linkname'] = $_REQUEST['facebook_linkname']; else $user_settings['facebook_linkname'] = ''; if ( !empty( $_REQUEST['facebook_caption'] ) ) $user_settings['facebook_caption'] = $_REQUEST['facebook_caption']; else $user_settings['facebook_caption'] = ''; if ( !empty( $_REQUEST['facebook_description'] ) ) $user_settings['facebook_description'] = $_REQUEST['facebook_description']; ------------------------- ------------------------- ------------------------- snip ------------------------ ------------------------- --------------------------

<?php
echo $user_settings['facebook_message']; ?></textarea></td>
                            </tr>
                            <tr>
                             <td><?php _e( 'Default Link Name:', 'leenkme'
); ?></td>
                                <td><input name="facebook_linkname"
type="text" style="width: 500px;" value="<?php echo
$user_settings['facebook_linkname']; ?>"  maxlength="100"/></td>
                            </tr>
                            <tr>
                             <td><?php _e( 'Default Caption:', 'leenkme' );
?></td>
                                <td><input name="facebook_caption"
type="text" style="width: 500px;" value="<?php echo
$user_settings['facebook_caption']; ?>" maxlength="100"/></td>
                            </tr>
                            <tr>
                             <td style='vertical-align: top; padding-top:
5px;'><?php _e( 'Default Description:', 'leenkme' ); ?></td>
                                <td><textarea name="facebook_description"
style="width: 500px;" maxlength="300"><?php echo
$user_settings['facebook_description']; ?></textarea></td>
 
 
The code used to protect against CSRF that is the anti csrf token used is
 
<?php wp_nonce_field( 'fb_publish', 'fb_publish_wpnonce' ); ?>
 
 
But this code is not protecting against the CSRF, the form get submitted
successfully with out any error even though the fb_publish_wpnonce is kept
empty resulting in CSRF vulnerability.
 
 
 
# Author email: cor3sm4sh3r[at]gmail.com
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