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Vulnerability of Mozilla NSS: information disclosure via P384

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via P384 of Mozilla NSS, in order to obtain sensitive information.
Impacted software: Debian, Fedora, Firefox, NSS, RHEL, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 27/07/2020.
Références of this announce: 1631583, CVE-2020-6829, DLA-2388-1, FEDORA-2020-f136f60e5f, MFSA2020-36, RHSA-2020:4076-01, USN-4455-1, USN-4474-1, USN-4474-2, VIGILANCE-VUL-32920.

Description of the vulnerability 

An attacker can bypass access restrictions to data via P384 of Mozilla NSS, in order to obtain sensitive information.
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This computer vulnerability impacts software or systems such as Debian, Fedora, Firefox, NSS, RHEL, Ubuntu.

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

Solutions for this threat 

Mozilla NSS: version 3.55.
The version 3.55 is fixed:
  http://ftp.mozilla.org/pub/security/nss/releases/

Debian 9: new nss packages.
New packages are available:
  Debian 9: nss 2:3.26.2-1.1+deb9u2

Fedora 31: new firefox packages.
New packages are available:
  Fedora 31: firefox 80.0-1.fc31

Mozilla Firefox: version 80.
The version 80 is fixed:
  https://www.mozilla.org/en-US/firefox/

RHEL 7.9: new nss/nspr packages.
New packages are available:
  RHEL 7.9: nspr 4.25.0-2.el7_9, nss 3.53.1-3.el7_9

Ubuntu: new firefox packages.
New packages are available:
  Ubuntu 20.04 LTS: firefox 80.0.1+build1-0ubuntu0.20.04.1
  Ubuntu 18.04 LTS: firefox 80.0.1+build1-0ubuntu0.18.04.1
  Ubuntu 16.04 LTS: firefox 80.0.1+build1-0ubuntu0.16.04.1

Ubuntu: new libnss3 packages.
New packages are available:
  Ubuntu 20.04 LTS: libnss3 2:3.49.1-1ubuntu1.4
  Ubuntu 18.04 LTS: libnss3 2:3.35-2ubuntu2.11
  Ubuntu 16.04 LTS: libnss3 2:3.28.4-0ubuntu0.16.04.13
  Ubuntu 14.04 ESM: libnss3 2:3.28.4-0ubuntu0.14.04.5+esm7
  Ubuntu 12.04 ESM: libnss3 2:3.28.4-0ubuntu0.12.04.10
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