Cybersecurity researchers have found surveillance backdoors in Chinese carrier routers made by Zbtlink and the same software in a different Zbtlink-made router sold through Amazon. Chinese law requires telecom and internet companies to provide technical assistance to police and state-security agencies. In an Aug. 27 report, cybersecurity firm VulnCheck said it found two hidden programs in an $88 router bought through Amazon from a U.S. seller. One, which the researchers named Speakingstone, sends information about the router to a remote server and can receive instructions to redirect internet traffic, obtain login credentials, or take control of the device. The second,...