There are serious flaws in the authentication and/or data transfer mechanisms on some
bluetooth enabled devices. Specifically, three vulnerabilities have been found:
* Firstly, confidential data can be obtained, anonymously, and without the owner’s knowledge or consent, from some bluetooth enabled mobile phones. This data includes, at least, the entire phonebook and calendar, and the phone’s IMEI.
* Secondly, it has been found that the complete memory contents of some mobile phones can be accessed by a previously trusted ("paired") device that has since been removed from the trusted list. This data includes not only the phonebook and calendar, but media files such as pictures and text messages. In essence, the entire device can be "backed up" to an attacker’s own system. Bluetooth Flaws Demystified | SecGuru
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