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Vulnerability of Mozilla NSS: information disclosure via Scalar Padding

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Scalar Padding of Mozilla NSS, in order to obtain sensitive information.
Vulnerable products: Debian, Fedora, Firefox, NSS, RHEL, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 27/07/2020.
Références of this bulletin: 1631573, CVE-2020-12401, DLA-2388-1, FEDORA-2020-426fd04fd0, FEDORA-2020-481c7e285d, FEDORA-2020-f136f60e5f, MFSA2020-36, RHSA-2020:4076-01, USN-4455-1, USN-4474-1, USN-4474-2, VIGILANCE-VUL-32922.

Description of the vulnerability 

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

Our Vigil@nce team determined that the severity of this cybersecurity 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 security alert.

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

Fedora 31: new nss packages.
New packages are available:
  Fedora 31: nss 3.55.0-1.fc31

Fedora 32: new nss packages.
New packages are available:
  Fedora 32: nss 3.55.0-1.fc32

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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