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Vulnerability of Node.js y18n: privilege escalation via Prototype Pollution

Synthesis of the vulnerability 

An attacker can bypass restrictions via Prototype Pollution of Node.js y18n, in order to escalate his privileges.
Vulnerable software: Nodejs Modules ~ not comprehensive, RHEL.
Severity of this announce: 2/4.
Creation date: 01/12/2020.
Références of this computer vulnerability: CVE-2020-7774, RHSA-2020:5305-01, RHSA-2020:5499-01, RHSA-2021:0421-01, RHSA-2021:0521-01, RHSA-2021:0548-01, RHSA-2021:0551-01, VIGILANCE-VUL-34015.

Description of the vulnerability 

An attacker can bypass restrictions via Prototype Pollution of Node.js y18n, in order to escalate his privileges.
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This computer weakness alert impacts software or systems such as Nodejs Modules ~ not comprehensive, RHEL.

Our Vigil@nce team determined that the severity of this weakness note 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 weakness bulletin.

Solutions for this threat 

Node.js y18n: version 5.0.5.
The version 5.0.5 is fixed:
  https://www.npmjs.com/package/y18n

RHEL 7: new rh-nodejs10-nodejs packages.
New packages are available:
  RHEL 7.0-7.9: rh-nodejs10-nodejs 10.23.1-2.el7

RHEL 7: new rh-nodejs12-nodejs packages.
New packages are available:
  RHEL 7.0-7.9: rh-nodejs12-nodejs 12.19.1-2.el7

RHEL 7: new rh-nodejs14-nodejs packages.
New packages are available:
  RHEL 7.0-7.9: rh-nodejs14-nodejs 14.15.4-2.el7

RHEL 8: new nodejs-10 module.
The following module is updated:
  RHEL 8 Module: nodejs:10

RHEL 8: new nodejs-12 module.
The following module is updated:
  RHEL 8 Module: nodejs:12

RHEL 8: new nodejs-14 module.
The following module is updated:
  RHEL 8 Module: nodejs:14
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