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Vulnerability of libX11: use after free via Locale

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via Locale of libX11, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Debian, Fedora, OpenBSD, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, libX11.
Severity of this weakness: 2/4.
Creation date: 25/08/2020.
Références of this bulletin: CVE-2020-14363, DLA-2361-1, FEDORA-2020-9a0b272cc1, FEDORA-2020-eba554b9d5, openSUSE-SU-2020:1368-1, openSUSE-SU-2020:1370-1, RHSA-2020:4908-01, RHSA-2020:4946-01, SUSE-SU-2020:2474-1, SUSE-SU-2020:2474-2, SUSE-SU-2020:2475-1, SUSE-SU-2020:2475-2, USN-4487-1, USN-4487-2, VIGILANCE-VUL-33144.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via Locale of libX11, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity note impacts software or systems such as Debian, Fedora, OpenBSD, openSUSE Leap, Solaris, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, libX11.

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

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this cybersecurity vulnerability.

Solutions for this threat 

libX11: version 1.6.12.
The version 1.6.12 is fixed:
  https://xorg.freedesktop.org/archive/individual/lib/libX11-1.6.12.tar.bz2

libX11: patch for Locale.
A patch is available:
  https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/acdaaadcb3d85c61fd43669fc5dddf0f8c3f911d

Debian 9: new libx11 packages.
New packages are available:
  Debian 9: libx11 2:1.6.4-3+deb9u3

Fedora 31: new libX11 packages.
New packages are available:
  Fedora 31: libX11 1.6.12-1.fc31

Fedora 32: new libX11 packages.
New packages are available:
  Fedora 32: libX11 1.6.12-1.fc32

OpenBSD: patch for xinitom/libX11.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.6/common/040_xinitom.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.7/common/021_xinitom.patch.sig

openSUSE Leap 15: new libX11 packages.
New packages are available:
  openSUSE Leap 15.1: libX11 6-1.6.5-lp151.4.9.1
  openSUSE Leap 15.2: libX11 6-1.6.5-lp152.5.9.1

Oracle Solaris: patch for third party software of October 2020 v4.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 6.10: new libX11 packages.
New packages are available:
  RHEL 6.10: libX11 1.6.4-4.el6_10

RHEL 7.9: new libX11 packages.
New packages are available:
  RHEL 7.9: libX11 1.6.7-3.el7_9

SUSE LE 12 SP2-4: new libX11 packages.
New packages are available:
  SUSE LE 12 SP2: libX11 6-1.6.2-12.15.1
  SUSE LE 12 SP3: libX11 6-1.6.2-12.15.1
  SUSE LE 12 SP4: libX11 6-1.6.2-12.15.1

SUSE LE 12 SP5: new libX11 packages.
New packages are available:
  SUSE LE 12 SP5: libX11 6-1.6.2-12.15.1

SUSE LE 15 RTM: new libX11 packages.
New packages are available:
  SUSE LE 15 RTM: libX11 1.6.5-3.12.1

SUSE LE 15 SP1-2: new libX11 packages.
New packages are available:
  SUSE LE 15 SP1: libX11 6-1.6.5-3.12.1
  SUSE LE 15 SP2: libX11 6-1.6.5-3.12.1

Ubuntu: new libx11-6 packages.
New packages are available:
  Ubuntu 20.04 LTS: libx11-6 2:1.6.9-2ubuntu1.1
  Ubuntu 18.04 LTS: libx11-6 2:1.6.4-3ubuntu0.3
  Ubuntu 16.04 LTS: libx11-6 2:1.6.3-1ubuntu2.2
  Ubuntu 14.04 ESM: libx11-6 2:1.6.2-1ubuntu2.1+esm1
  Ubuntu 12.04 ESM: libx11-6 2:1.4.99.1-0ubuntu2.5
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