Hidattack -lets attackers hijack a Bluetooth keyboard, and BTCrack
could give an attacker full access to two connected Bluetooth devices. Since Bluetooth is being more commonly used, more confidential data is being transferred.
Collin Mulliner, developer of Hidattack states, "An attacker Bluetooth 'scans' for a PC in an interesting location, say, in a bank, which has an active Bluetooth HID driver running. Once he finds a victim PC, the attacker's PC becomes a Bluetooth keyboard, which basically is like sitting in front of the victim's PC. The attacker now has full control and therefore can do whatever he wants."
Read more on hidattack and details of BTCrack by checking out this article: http://www.darkreading.com/document.asp?doc_id=113669