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New research disclosed a string of severe security vulnerabilities in the ‘Find My Mobile‘—an Android app that comes pre-installed on most Samsung smartphones—that could have allowed remote attackers to track victims’ real-time location, monitor phone calls, and messages, and even delete data stored on the phone.

Portugal-based cybersecurity services provider Char49 revealed its findings on Samsung’s Find My Mobile Android app at the DEF CON conference last week and shared details with the Hacker News.

“This flaw, after setup, can be easily exploited and with severe implications for the user and with a potentially catastrophic impact: permanent denial of service via phone lock, complete data loss with factory reset (SD card included), serious privacy implication via IMEI and location tracking as well as call and SMS log access,” Char49’s Pedro Umbelino said in technical analysis.

The flaws, which work on unpatched Samsung Galaxy S7, S8, and S9+ devices, were addressed by Samsung after flagging the exploit as a “high impact vulnerability.”

Samsung’s Find My Mobile service allows owners of Samsung devices to remotely locate or lock their smartphone or tablet, back up data stored on the devices to Samsung Cloud, wipe local data, and block access to Samsung Pay.

According to Char49, there were four different vulnerabilities in the app that could have been exploited by a malicious app installed on the targeted device, thus creating a man-in-the-disk attack to hijack communication from the backend servers and snoop on the victim.

images from Hacker News