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Vulnerability of ImageMagick: NULL pointer dereference via PersistPixelCache

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via PersistPixelCache() of ImageMagick, in order to trigger a denial of service.
Vulnerable software: Debian, Ubuntu.
Severity of this announce: 1/4.
Creation date: 11/10/2017.
Références of this computer vulnerability: CVE-2017-14400, DLA-1131-1, DLA-1785-1, DLA-2366-1, USN-3681-1, VIGILANCE-VUL-24079.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this computer weakness 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 vulnerability announce.

Solutions for this threat 

Debian 7: new imagemagick packages.
New packages are available:
  Debian 7: imagemagick 8:6.7.7.10-5+deb7u17

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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