==========================================================================
Ubuntu Security Notice USN-4311-1
March 30, 2020

bluez vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in BlueZ.

Software Description:
- bluez: Bluetooth tools and daemons

Details:

It was discovered that BlueZ incorrectly handled bonding HID and HOGP
devices. A local attacker could possibly use this issue to impersonate
non-bonded devices. (CVE-2020-0556)

It was discovered that BlueZ incorrectly handled certain commands. A local
attacker could use this issue to cause BlueZ to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 16.04 LTS. (CVE-2016-7837)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.10:
  bluez                           5.50-0ubuntu5.1
  libbluetooth3                   5.50-0ubuntu5.1

Ubuntu 18.04 LTS:
  bluez                           5.48-0ubuntu3.4
  libbluetooth3                   5.48-0ubuntu3.4

Ubuntu 16.04 LTS:
  bluez                           5.37-0ubuntu5.3
  libbluetooth3                   5.37-0ubuntu5.3

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4311-1
  CVE-2016-7837, CVE-2020-0556

Package Information:
  https://launchpad.net/ubuntu/+source/bluez/5.50-0ubuntu5.1
  https://launchpad.net/ubuntu/+source/bluez/5.48-0ubuntu3.4
  https://launchpad.net/ubuntu/+source/bluez/5.37-0ubuntu5.3