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Vulnerability of GNU patch: read-write access via Symlink Following

Synthesis of the vulnerability 

An attacker can bypass access restrictions via Symlink Following of GNU patch, in order to read or alter data.
Impacted systems: Debian, Fedora, Solaris, RHEL, Ubuntu.
Severity of this alert: 2/4.
Creation date: 22/07/2019.
Références of this alert: CVE-2019-13636, DLA-1856-1, DSA-4489-1, FEDORA-2019-ac709da87f, RHSA-2020:1852-01, USN-4071-1, USN-4071-2, VIGILANCE-VUL-29843.

Description of the vulnerability 

An attacker can bypass access restrictions via Symlink Following of GNU patch, in order to read or alter data.
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This weakness bulletin impacts software or systems such as Debian, Fedora, Solaris, RHEL, Ubuntu.

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

Solutions for this threat 

Debian 8: new patch packages.
New packages are available:
  Debian 8: patch 2.7.5-1+deb8u2

Debian 9/10: new patch packages.
New packages are available:
  Debian 9: patch 2.7.5-1+deb9u2
  Debian 10: patch 2.7.6-3+deb10u1

Fedora 30: new patch packages.
New packages are available:
  Fedora 30: patch 2.7.6-11.fc30

Oracle Solaris: patch for third party software of October 2019 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 8: new patch packages.
New packages are available:
  RHEL 8.0-8.1: patch 2.7.6-11.el8

Ubuntu: new patch packages.
New packages are available:
  Ubuntu 19.04: patch 2.7.6-3ubuntu0.1
  Ubuntu 18.04 LTS: patch 2.7.6-2ubuntu1.1
  Ubuntu 16.04 LTS: patch 2.7.5-1ubuntu0.16.04.2
  Ubuntu 14.04 ESM: patch 2.7.1-4ubuntu2.4+esm1

Wind River Linux: version 10.18.44.10.
The version 10.18.44.10 is fixed:
  https://support2.windriver.com/
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