![]() ![]() $ext = pathinfo($filename, PATHINFO_EXTENSION) If they must be displayed or downloaded from the applicationm, ensure they are served by either octet-stream downloads or from an unrelated domain.Example Download "image/jpg", "jpeg" => "image/jpeg", "gif" => "image/gif", "png" => "image/png") Verify that user-uploaded files are stored in designated directories outside of the web root. Developers must enforce size limits on uploaded files and reject archive formats (like ZIP) from being uploaded at all. ![]() ![]() Uploaded files should be subject to immediate virus scanning.Developers should ensure that if uploaded files are downloaded by users, they contain X-Content-Type-options: nosniff header and a Content-Disposition header that commands browsers to handle files as an attachment.Uploads must not be placed in directories that are accessible from the web.Developers should alter permissions on the upload folder to ensure the files can’t be executed.that are used to place files outside of designated directory locations. Developers should ensure file names do not contain directory traversal characters such as.Developers must use an allow list, enforcing acceptance of only listed, non-executable file extensions.There are numerous steps toward a more robust upload code architecture that developers must consider in their design: If the storage location for uploaded content is escapable with a crafted filename.If the header information is returned after the contents of a file are downloaded. ![]()
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