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File upload means sending a file from a local system to a remote system such as a server or another client with the intent that the remote system should store a copy of the file being transferred.
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Does changing an uploaded executable's file extension to .png render it safe?
There are basically two main ways an uploaded file can be harmful: by being executed (as a script or binary) or by being run/used in an application and abusing an exploit in it (e.g. an uploaded MP3 w …