file-upload-testing

To test file upload vulnerabilities, you assess the upload endpoint for unverified file types, content validation bypasses, path traversal, and race conditions using comprehensive penetration testing methodologies.

Uploading a webshell involves bypassing content validation and file type restrictions using techniques like .htaccess manipulation to execute malicious files on the target server.

Secure file upload features require defensive strategies including file type whitelisting, content validation, renaming uploaded files, and implementing secure storage to prevent execution.

Path traversal during file upload occurs when an application fails to properly sanitize the file name or upload path, allowing an attacker to save files outside the intended directory.

A file upload race condition is exploited by rapidly uploading and requesting a malicious file before the application deletes or validates it, allowing execution of unauthorized code.