Turkish security researcher Ibrahim Balic has successfully connected 17 million phone numbers to associated users through a bug in the Twitter app for Android. This was caused by an error in the download functionality of the contacts, which returns the user information after entering the phone number. Because the application doesn't allow sequential loading of numbers, he used hundreds of fake user accounts for action.
Balic thus uploaded more than two billion randomly generated phone numbers and managed to retrieve data on millions of individuals from several countries in two months (on December 20, Twitter stopped this). He also sent a sample of the data to reporters, who verified it using the Twitter password reset feature and, in the process, managed to identify a high-ranking Israeli politician.
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