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Vulnerability of BlueZ: privilege escalation via Subsystem Access Control

Synthesis of the vulnerability 

An attacker can bypass restrictions via Subsystem Access Control of BlueZ, in order to escalate his privileges.
Impacted systems: Debian, openSUSE Leap, Ubuntu.
Severity of this alert: 2/4.
Creation date: 27/03/2020.
Références of this alert: CVE-2020-0556, DLA-2240-1, DSA-4647-1, openSUSE-SU-2020:0479-1, openSUSE-SU-2020:0872-1, USN-4311-1, VIGILANCE-VUL-31889.

Description of the vulnerability 

An attacker can bypass restrictions via Subsystem Access Control of BlueZ, in order to escalate his privileges.
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This computer weakness note impacts software or systems such as Debian, openSUSE Leap, Ubuntu.

Our Vigil@nce team determined that the severity of this security bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this weakness announce.

Solutions for this threat 

Debian 8: new bluez packages.
New packages are available:
  Debian 8: bluez 5.43-2+deb9u2~deb8u1

Debian 9/10: new bluez packages.
New packages are available:
  Debian 9: bluez 5.43-2+deb9u2
  Debian 10: bluez 5.50-1.2~deb10u1

openSUSE Leap 15.1: new bluez packages.
New packages are available:
  openSUSE Leap 15.1: bluez 5.48-lp151.8.12.1

openSUSE Leap 15.2: new bluez packages.
New packages are available:
  openSUSE Leap 15.2: bluez 5.48-lp152.12.3.1

Ubuntu: new bluez packages.
New packages are available:
  Ubuntu 19.10: bluez 5.50-0ubuntu5.1
  Ubuntu 18.04 LTS: bluez 5.48-0ubuntu3.4
  Ubuntu 16.04 LTS: bluez 5.37-0ubuntu5.3

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.18.44.16.
The version 10.18.44.16 is fixed:
  https://support2.windriver.com/
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