Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

While testing a photo-sharing application you discover that its POST /api/upload endpoint saves every incoming file, without modification, directly into the server's public/assets directory and only checks that the request's Content-Type header is exactly image/png. What is the most reliable technique to upload a working PHP web shell through this API under these conditions?

  • Upload a PNG-PHP polyglot that starts with valid PNG header bytes, save it as shell.php, and include your PHP payload after the PNG data.

  • Issue an HTTP PUT request to replace public/assets/index.html with raw PHP code while keeping the Content-Type set to image/png.

  • Name the file shell.php%00.png to rely on a null-byte truncation of the extension during upload validation.

  • Change the Content-Type header to application/x-php and upload a plain PHP script whose filename ends in .png.

Certified Ethical Hacker (CEH)
Web Application Hacking
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