The vast majority of 3G and 4G USB modems handed out by mobile operators to their customers are manufactured by a handful of companies and run insecure software, according to two security researchers from Russia. Researchers Nikita Tarakanov and Oleg Kupreev analyzed the security of 3G/4G USB modems obtained from Russian operators for the past several months. Their findings were presented Thursday at the Black Hat Europe 2013 security conference in Amsterdam.