A bug in Bluez may allow for the Bluetooth Discoverable state being set to
on when no Bluetooth agent is registered with the system. This situation
could lead to the unauthorized pairing of certain Bluetooth devices without
any form of authentication. Versions before bluez 5.51 are vulnerable.
 mdeslaur> actual bug in bluez, but there is a work-around in gnome-bluetooth
 mdeslaur> gnome-bluetooth <=3.26 used synchronous d-bus calls, so the
 mdeslaur> issue doesn't present itself
Source: bluez (LP Ubuntu Debian)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was needed)
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):needed
Ubuntu 18.10 (Cosmic Cuttlefish):ignored (reached end-of-life)
Ubuntu 19.04 (Disco Dingo):needed
Ubuntu 19.10 (Eoan):needed
Upstream:released (3.28.1)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was not-affected [])
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (3.18.2-1ubuntu2)
Ubuntu 18.04 LTS (Bionic Beaver):released (3.28.0-2ubuntu0.1)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (3.28.2-2)
Ubuntu 19.04 (Disco Dingo):not-affected (3.28.2-3)
Ubuntu 19.10 (Eoan):not-affected (3.28.2-3)
More Information

Updated: 2019-07-18 17:29:15 UTC (commit 649f8c6455205380e35ed054e9ea734222c716bb)