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Vulnerability of GraphicsMagick: assertion error via ReadDIBImage

Synthesis of the vulnerability 

An attacker can force an assertion error via ReadDIBImage() of GraphicsMagick, in order to trigger a denial of service.
Vulnerable software: Debian, openSUSE Leap, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 27/12/2018.
Références of this computer vulnerability: CVE-2018-20189, DLA-1619-1, DSA-4640-1, openSUSE-SU-2018:4313-1, openSUSE-SU-2019:0001-1, openSUSE-SU-2019:0003-1, openSUSE-SU-2019:1-1, USN-4207-1, VIGILANCE-VUL-28111.

Description of the vulnerability 

An attacker can force an assertion error via ReadDIBImage() of GraphicsMagick, in order to trigger a denial of service.
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This cybersecurity announce impacts software or systems such as Debian, openSUSE Leap, SLES, Ubuntu.

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

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 weakness alert.

Solutions for this threat 

Debian 8: new graphicsmagick packages.
New packages are available:
  Debian 8: graphicsmagick 1.3.20-3+deb8u5

Debian 9/10: new graphicsmagick packages.
New packages are available:
  Debian 9: graphicsmagick 1.3.30+hg15796-1~deb9u3
  Debian 10: graphicsmagick 1.4~hg15978-1+deb10u1

openSUSE Leap 15.0: new GraphicsMagick packages.
New packages are available:
  openSUSE Leap 15.0: GraphicsMagick 1.3.29-lp150.3.18.1
  SUSE LE 15 RTM: GraphicsMagick 1.3.29-bp150.2.12.1

openSUSE Leap 42.3: new GraphicsMagick packages.
New packages are available:
  openSUSE Leap 42.3: GraphicsMagick 1.3.25-120.1

Ubuntu 18.04: new graphicsmagick packages.
New packages are available:
  Ubuntu 18.04 LTS: graphicsmagick 1.3.28-2ubuntu0.1
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