AFP via Getty ImagesHundreds of French supermarkets have been hit by a cyber attack that caused their fridges and freezers to heat up, spoiling fresh and frozen food estimated to be worth millions of euros.Hackers gained control of the software that regulates the temperatures of the refrigeration units, forcing some to warm to 50C (120F) overnight.The chief executive of Coopérative U said several of its supermarkets had been hit by the "extremely serious and unprecedented" attack. More than 100 ...