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Vulnerability of Ruby Kramdown: code execution via template option

Synthesis of the vulnerability 

An attacker can use a vulnerability via template option of Ruby Kramdown, in order to run code.
Impacted products: Debian, Fedora, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 10/08/2020.
Références of this threat: CVE-2020-14001, DLA-2316-1, DSA-4743-1, FEDORA-2020-5c70d97eca, FEDORA-2020-f6eee9a2d3, USN-4562-1, USN-4562-2, VIGILANCE-VUL-33039.

Description of the vulnerability 

An attacker can use a vulnerability via template option of Ruby Kramdown, in order to run code.
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This cybersecurity announce impacts software or systems such as Debian, Fedora, Ubuntu.

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 

Debian 10: new ruby-kramdown packages.
New packages are available:
  Debian 10: ruby-kramdown 1.17.0-1+deb10u1

Debian 9: new ruby-kramdown packages.
New packages are available:
  Debian 9: ruby-kramdown 1.12.0-1+deb9u1

Fedora 31-32: new rubygem-kramdown packages.
New packages are available:
  Fedora 31: rubygem-kramdown 1.17.0-6.fc31
  Fedora 32: rubygem-kramdown 2.1.0-3.fc32

Ubuntu: new kramdown packages.
New packages are available:
  Ubuntu 20.04 LTS: kramdown 1.17.0-4ubuntu0.1
  Ubuntu 20.10: kramdown 1.17.0-4ubuntu0.20.10.1
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