btif/src/btif_dm.c in Android before 5.1 does not properly enforce the temporary nature of a Bluetooth pairing, which allows user-assisted remote attackers to bypass intended access restrictions via crafted Bluetooth packets after the tapping of a crafted NFC tag.
En el archivo btif/src/btif_dm.c en Android versiones anteriores a 5.1, no aplica apropiadamente la naturaleza temporal de emparejar Bluetooth, lo que permite a atacantes remotos asistidos por el usuario omitir las restricciones de acceso previstas mediante paquetes Bluetooth diseñados luego del aprovechamiento de una etiqueta NFC diseñada
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Google Android. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the Bluetooth application stack allowing for arbitrary Host Controller Interface commands to be issued without prior pairing. By obtaining a Bluetooth address, creating and emulating a Bluetooth out-of-band 'handover' NFC NDEF tag, and sniffing encryption keys and exchanging them with the device, an attacker can force pairing with a Bluetooth device. A remote attacker can use this to achieve remote code execution under the context of the process.
