A researcher who noted that using the "People Nearby" feature of popular messaging app Telegram exposed the exact location of the user has been told that it's working as expected.
Folk who activate this feature see a list of other users within a few miles to "quickly add people nearby... and discover local group chats."
Using a utility that fakes the location of an Android device, Ahmed Hassan was able to discover the distance of individuals from three different points, and then use trilateration to pinpoint exactly where they were. He was able to retrieve exact home addresses using this method, which is not technically difficult.
Using trilateration to pinpoint an exact location from three separate distances. Pic courtesy: Ahmed's Notes
Hassan reported the issue in the ..
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