Thousands of car dealerships in the United States were paralysed for hours on Wednesday after a cyberattack on a software provider. The affected company, CDK Global, specializes in automotive retail. According to the firm, its software is used at nearly 15,000 car dealer locations. Following a cyberattack, “we proactively shut all systems down and executed extensive testing and consulted with external third-party experts,” a CDK spokeswoman said. According to the company, its “core DMS and Digital Retailing solutions” were restored a few hours later. With one software often used across one ind…