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Vulnerability of PHPMailer: code execution via Object Injection

Synthesis of the vulnerability 

An attacker can use a vulnerability via Object Injection of PHPMailer, in order to run code.
Impacted systems: Debian, Fedora, WordPress Core.
Severity of this alert: 3/4.
Creation date: 23/11/2018.
Références of this alert: CERTFR-2021-AVI-378, CVE-2018-19296, DLA-1591-1, DLA-1591-2, DSA-4351-1, FEDORA-2018-0f5e6e9957, FEDORA-2018-18f3eff32b, FEDORA-2018-46b92c9064, FEDORA-2018-a2e9bd6eae, FEDORA-2018-daee493feb, FEDORA-2018-f73869d61e, FEDORA-2021-5abe99c62b, FEDORA-2021-935da812d7, FEDORA-2021-b21bbfa198, VIGILANCE-VUL-27869.

Description of the vulnerability 

An attacker can use a vulnerability via Object Injection of PHPMailer, in order to run code.
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This vulnerability note impacts software or systems such as Debian, Fedora, WordPress Core.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability is important.

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 note.

Solutions for this threat 

Debian 8: new libphp-phpmailer packages.
New packages are available:
  Debian 8: libphp-phpmailer 5.2.9+dfsg-2+deb8u5

Debian 9: new libphp-phpmailer packages.
New packages are available:
  Debian 9: libphp-phpmailer 5.2.14+dfsg-2.3+deb9u1

Fedora 33-34: new wordpress packages.
New packages are available:
  Fedora 33: wordpress 5.7.2-1.fc33
  Fedora 34: wordpress 5.7.2-1.fc34

Fedora 34: new php-phpmailer6 packages.
New packages are available:
  Fedora 34: php-phpmailer6 6.4.1-1.fc34

Fedora: new php-phpmailer6 packages.
New packages are available:
  Fedora 27: php-phpmailer6 6.0.6-1.fc27
  Fedora 28: php-phpmailer6 6.0.6-1.fc28
  Fedora 29: php-phpmailer6 6.0.6-1.fc29

Fedora: new php-PHPMailer packages.
New packages are available:
  Fedora 27: php-PHPMailer 5.2.27-1.fc27
  Fedora 28: php-PHPMailer 5.2.27-1.fc28
  Fedora 29: php-PHPMailer 5.2.27-1.fc29

WordPress Core: versions 3.7.36, 3.8.36, 3.9.34, 4.0.33, 4.1.33, 4.2.30, 4.3.26, 4.4.25, 4.5.24, 4.6.21, 4.7.21, 4.8.17, 4.9.18, 5.0.13, 5.1.10, 5.2.11,5.3.8, 5.4.6, 5.5.4, 5.5.5, 5.6.4 and 5.7.2.
Versions 3.7.36, 3.8.36, 3.9.34, 4.0.33, 4.1.33, 4.2.30, 4.3.26, 4.4.25, 4.5.24, 4.6.21, 4.7.21, 4.8.17, 4.9.18, 5.0.13, 5.1.10, 5.2.11,5.3.8, 5.4.6, 5.5.4, 5.5.5, 5.6.4 and 5.7.2 are fixed:
  https://github.com/WordPress/wordpress-develop/releases
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