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Vulnerability of libxml2: infinite loop via xmlStringLenDecodeEntities

Synthesis of the vulnerability 

An attacker can trigger an infinite loop via xmlStringLenDecodeEntities() of libxml2, in order to trigger a denial of service.
Impacted software: Debian, Fedora, libxml, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 22/01/2020.
Références of this announce: CVE-2020-7595, DLA-2369-1, FEDORA-2020-0c71c00af4, FEDORA-2020-41fe1680f6, FEDORA-2020-7694e8be73, openSUSE-SU-2020:0681-1, RHSA-2020:3996-01, SUSE-SU-2020:2609-1, USN-4274-1, VIGILANCE-VUL-31396.

Description of the vulnerability 

An attacker can trigger an infinite loop via xmlStringLenDecodeEntities() of libxml2, in order to trigger a denial of service.
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This threat bulletin impacts software or systems such as Debian, Fedora, libxml, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, 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 

libxml2: patch for xmlStringLenDecodeEntities.
A patch is indicated in information sources.

Debian 9: new libxml2 packages.
New packages are available:
  Debian 9: libxml2 2.9.4+dfsg1-2.2+deb9u3

Fedora 30: new libxml2 packages.
New packages are available:
  Fedora 30: libxml2 2.9.10-3.fc30

Fedora 31: new libxml2 packages.
New packages are available:
  Fedora 31: libxml2 2.9.10-3.fc31

Fedora 32: new mingw-libxml2 packages.
New packages are available:
  Fedora 32: mingw-libxml2 2.9.10-1.fc32

openSUSE Leap 15.1: new libxml2 packages (25/05/2020).
New packages are available:
  openSUSE Leap 15.1: libxml2 2-2.9.7-lp151.5.9.1

RHEL 7.8: new libxml2 packages.
New packages are available:
  RHEL 7.0-7.8: libxml2 2.9.1-6.el7.5

SUSE LE 12 SP5: new libxml2 packages.
New packages are available:
  SUSE LE 12 SP5: libxml2 2-2.9.4-46.34.1

Ubuntu: new libxml2 packages.
New packages are available:
  Ubuntu 19.10: libxml2 2.9.4+dfsg1-7ubuntu3.1, libxml2-utils 2.9.4+dfsg1-7ubuntu3.1
  Ubuntu 18.04 LTS: libxml2 2.9.4+dfsg1-6.1ubuntu1.3, libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.3
  Ubuntu 16.04 LTS: libxml2 2.9.3+dfsg1-1ubuntu0.7, libxml2-utils 2.9.3+dfsg1-1ubuntu0.7
  Ubuntu 14.04 ESM: libxml2 2.9.1+dfsg1-3ubuntu4.13+esm1, libxml2-utils 2.9.1+dfsg1-3ubuntu4.13+esm1
  Ubuntu 12.04 ESM: libxml2 2.7.8.dfsg-5.1ubuntu4.22, libxml2-utils 2.7.8.dfsg-5.1ubuntu4.22

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/
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