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Vulnerability of Poppler: NULL pointer dereference via XRef-getEntry

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via XRef::getEntry() of Poppler, in order to trigger a denial of service.
Vulnerable software: Debian, Fedora, RHEL, Ubuntu.
Severity of this announce: 2/4.
Creation date: 22/01/2019.
Références of this computer vulnerability: CVE-2018-20481, DLA-1706-1, DLA-2287-1, FEDORA-2019-40f4af0687, FEDORA-2019-7ff7f5093e, FEDORA-2019-b0bd3c604a, RHSA-2019:2022-01, RHSA-2019:2713-01, USN-3865-1, VIGILANCE-VUL-28327.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via XRef::getEntry() of Poppler, in order to trigger a denial of service.
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This computer vulnerability alert impacts software or systems such as Debian, Fedora, RHEL, Ubuntu.

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

Solutions for this threat 

Debian 8: new poppler packages.
New packages are available:
  Debian 8: poppler 0.26.5-2+deb8u8

Debian 9: new poppler packages.
New packages are available:
  Debian 9: poppler 0.48.0-2+deb9u3

Fedora 28: new poppler packages.
New packages are available:
  Fedora 28: poppler 0.62.0-14.fc28

Fedora 29: new mingw-poppler packages.
New packages are available:
  Fedora 29: mingw-poppler 0.67.0-3.fc29

Fedora 29: new poppler packages.
New packages are available:
  Fedora 29: poppler 0.67.0-10.fc29

RHEL 7: new poppler packages.
New packages are available:
  RHEL 7: poppler 0.26.5-38.el7

RHEL 8.0: new poppler packages.
New packages are available:
  RHEL 8: poppler 0.66.0-11.el8_0.12

Ubuntu: new poppler packages.
New packages are available:
  Ubuntu 18.10: libpoppler79 0.68.0-0ubuntu1.4, poppler-utils 0.68.0-0ubuntu1.4
  Ubuntu 18.04 LTS: libpoppler73 0.62.0-2ubuntu2.6, poppler-utils 0.62.0-2ubuntu2.6
  Ubuntu 16.04 LTS: libpoppler58 0.41.0-0ubuntu1.11, poppler-utils 0.41.0-0ubuntu1.11
  Ubuntu 14.04 LTS: libpoppler44 0.24.5-2ubuntu4.15, poppler-utils 0.24.5-2ubuntu4.15
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