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Vulnerability of ImageMagick: NULL pointer dereference via sixel_output_create

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sixel_output_create() of ImageMagick, in order to trigger a denial of service.
Impacted software: Debian, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 12/06/2018.
Références of this announce: CVE-2017-14625, DLA-1785-1, DLA-2366-1, USN-3681-1, VIGILANCE-VUL-26380.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sixel_output_create() of ImageMagick, in order to trigger a denial of service.
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This threat bulletin impacts software or systems such as Debian, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat bulletin is low.

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

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

Solutions for this threat 

Debian 8: new imagemagick packages (14/05/2019).
New packages are available:
  Debian 8: imagemagick 8:6.8.9.9-5+deb8u16

Debian 9: new imagemagick packages (08/09/2020).
New packages are available:
  Debian 9: imagemagick 8:6.9.7.4+dfsg-11+deb9u10

Ubuntu: new imagemagick packages.
New packages are available:
  Ubuntu 18.04 LTS: imagemagick 8:6.9.7.4+dfsg-16ubuntu6.2
  Ubuntu 17.10: imagemagick 8:6.9.7.4+dfsg-16ubuntu2.2
  Ubuntu 16.04 LTS: imagemagick 8:6.8.9.9-7ubuntu5.11
  Ubuntu 14.04 LTS: imagemagick 8:6.7.7.10-6ubuntu3.11
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