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Vulnerability of LibVNCServer: buffer overflow via Long Socket Filename

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via Long Socket Filename of LibVNCServer, in order to trigger a denial of service, and possibly to run code.
Impacted software: Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 30/06/2020.
Références of this announce: CVE-2019-20839, DLA-2264-1, DLA-2347-1, openSUSE-SU-2020:0988-1, openSUSE-SU-2020:1025-1, openSUSE-SU-2020:1056-1, SUSE-SU-2020:2167-1, USN-4434-1, VIGILANCE-VUL-32650.

Description of the vulnerability 

An attacker can trigger a buffer overflow via Long Socket Filename of LibVNCServer, in order to trigger a denial of service, and possibly to run code.
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This computer weakness bulletin impacts software or systems such as Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

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

Solutions for this threat 

Debian 8: new libvncserver packages.
New packages are available:
  Debian 8: libvncserver 0.9.9+dfsg2-6.1+deb8u8

Debian 9: new libvncserver packages.
New packages are available:
  Debian 9: libvncserver 0.9.11+dfsg-1.3~deb9u5

openSUSE Leap 15.1: new LibVNCServer packages (20/07/2020).
New packages are available:
  openSUSE Leap 15.1: LibVNCServer 0.9.10-lp151.7.9.1

openSUSE Leap 15.2: new LibVNCServer packages (21/07/2020).
New packages are available:
  openSUSE Leap 15.2: LibVNCServer 0.9.10-lp152.9.8.1

openSUSE Leap 15.2: new LibVNCServer packages (27/07/2020).
New packages are available:
  openSUSE Leap 15.2: LibVNCServer 0.9.10-lp152.9.4.2

SUSE LE 12: new LibVNCServer packages.
New packages are available:
  SUSE LE 12 SP2: LibVNCServer 0.9.9-17.31.1
  SUSE LE 12 SP3: LibVNCServer 0.9.9-17.31.1
  SUSE LE 12 SP4: LibVNCServer 0.9.9-17.31.1
  SUSE LE 12 SP5: LibVNCServer 0.9.9-17.31.1

Ubuntu: new libvnc packages.
New packages are available:
  Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.2, libvncserver1 0.9.12+dfsg-9ubuntu0.2
  Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3, libvncserver1 0.9.11+dfsg-1ubuntu1.3
  Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5, libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5
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