    def _dump(self, file=None, format=None):
        import tempfile, os
        if not file:
            f, file = tempfile.mkstemp(format or '')
            os.close(f)
            
        self.load()
        if not format or format == "PPM":
            self.im.save_ppm(file)
        else:
            if file.endswith(format):
                file = file + "." + format
            self.save(file, format)
        return file
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.