Storing data locally is a common task for mobile applications. Such data includes files among other things. One convenient way to store files is to use the external file storage which usually offers a larger amount of disc space compared to internal storage.
Files created on the external storage are globally readable and writable. Therefore, a malicious application having the permissions `+WRITE_EXTERNAL_STORAGE+` or `+READ_EXTERNAL_STORAGE+` could try to read sensitive information from the files that other applications have stored on the external storage.
