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Vulnerability of libxml2: buffer overflow via xmllint xmlEncodeEntitiesInternal

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via xmllint xmlEncodeEntitiesInternal() of libxml2, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Debian, Fedora, libxml, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this announce: 2/4.
Creation date: 04/09/2020.
Références of this computer vulnerability: CVE-2020-24977, DLA-2369-1, FEDORA-2020-20ab468a33, FEDORA-2020-7773c53bc8, FEDORA-2020-7dd29dacad, FEDORA-2020-935f62c3d9, FEDORA-2020-b60dbdd538, FEDORA-2020-b6aaf25741, FEDORA-2020-ff317550e4, openSUSE-SU-2020:1430-1, openSUSE-SU-2020:1465-1, SUSE-SU-2020:2609-1, SUSE-SU-2020:2612-1, VIGILANCE-VUL-33259.

Description of the vulnerability 

An attacker can trigger a buffer overflow via xmllint xmlEncodeEntitiesInternal() of libxml2, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity announce impacts software or systems such as Debian, Fedora, libxml, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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 

libxml2: patch for xmllint xmlEncodeEntitiesInternal.
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 31-32: new mingw-libxml2 packages.
New packages are available:
  Fedora 31: mingw-libxml2 2.9.10-3.fc31
  Fedora 32: mingw-libxml2 2.9.10-3.fc32

Fedora 31: new libxml2 packages.
New packages are available:
  Fedora 31: libxml2 2.9.10-4.fc31

Fedora 32-33: new mingw-libxml2 packages.
New packages are available:
  Fedora 32: mingw-libxml2 2.9.10-8.fc32
  Fedora 33: mingw-libxml2 2.9.10-8.fc33

Fedora 32: new libxml2 packages.
New packages are available:
  Fedora 32: libxml2 2.9.10-8.fc32

Fedora 33: new libxml2 packages.
New packages are available:
  Fedora 33: libxml2 2.9.10-8.fc33

openSUSE Leap 15.1: new libxml2 packages.
New packages are available:
  openSUSE Leap 15.1: libxml2 2-2.9.7-lp151.5.15.1

openSUSE Leap 15.2: new libxml2 packages.
New packages are available:
  openSUSE Leap 15.2: libxml2 2-2.9.7-lp152.10.3.1

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

SUSE LE 15 SP1-2: new libxml2 packages.
New packages are available:
  SUSE LE 15 SP1: libxml2 2-2.9.7-3.25.1
  SUSE LE 15 SP2: libxml2 2-2.9.7-3.25.1

Wind River Linux: version 10.17.41.23.
The version 10.17.41.23 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=2&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list

Wind River Linux: version 10.19.45.12.
The version 10.19.45.12 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=24&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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