August 10, 2015 by Craig Charles 2 Comments A privacy vulnerability on Facebook could allow strangers to link your phone number to your name and profile picture, potentially leading to a host of targeted attacks. And if you have given it to Facebook, you could be at risk of targeted attacks from criminals who have managed to link your phone number to your name, simply because you didn’t realise that Facebook sets the default setting ”Who can look you up using the phone number you provided?” to public. That means someone can type your phone number into the Search facility on Facebook and get directed to your profile.
However software developer Reza Moaiandin managed to build a piece of software that essentially automates the process of typing in phone numbers into Facebook, going through one phone number at a time [but very quickly] and connecting those phone numbers to the names of the Facebook profiles associated with them, and recording the results to a database.
This could allow any developer to build an enormous database of their own, linking phone numbers to the names and even locations of the people who own them, on a very large scale. Technically no private information is being exposed, because Facebook defaults the setting to allow anyone to look you up via your phone number.
This prevents third party developers from obtaining your phone number and thus not allowing them to link it to your name.

It’s bad enough that Facebook make this setting public by default, but allowing potentially malicious developers from grabbing this information on a large scale is asking for trouble. This fact coupled with the ability to allow third party developers to execute large searches makes this a significant vulnerability.
Whilst you’re over there, also make sure the same setting regarding your email address is also set to friends as well. Facebook either need to make this setting private by default or work harder to prevent developers from obtaining so much public information so easily.
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Head straight to your settings, click Privacy and make sure the above mentioned option is set to Friends, not Everyone. Alternatively for more information on a particular author you can click the authors name at the bottom of each article.
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