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Vulnerability of Mozilla NSS: information disclosure via Multi-part ChaCha20

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Multi-part ChaCha20 of Mozilla NSS, in order to obtain sensitive information.
Vulnerable software: Debian, WebSphere MQ, McAfee Web Gateway, NSS, RHEL, Ubuntu.
Severity of this announce: 2/4.
Creation date: 27/07/2020.
Références of this computer vulnerability: 1636771, 6403293, CVE-2020-12403, DLA-2388-1, RHSA-2020:4076-01, RHSA-2021:0538-01, USN-4476-1, VIGILANCE-VUL-32923.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Multi-part ChaCha20 of Mozilla NSS, in order to obtain sensitive information.
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This weakness bulletin impacts software or systems such as Debian, WebSphere MQ, McAfee Web Gateway, NSS, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness 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 vulnerability announce.

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

IBM MQ Appliance: fixed versions for NSS/NSPR.
Fixed versions are indicated in information sources.

McAfee Web Gateway: version 8.2.15.
The version 8.2.15 is fixed:
  https://www.mcafee.com/

McAfee Web Gateway: version 9.2.6.
The version 9.2.6 is fixed:
  https://www.mcafee.com/

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

RHEL 8.3: new nss packages.
New packages are available:
  RHEL 8.3: nss 3.53.1-17.el8_3

Ubuntu: new libnss3 packages.
New packages are available:
  Ubuntu 20.04 LTS: libnss3 2:3.49.1-1ubuntu1.5
  Ubuntu 18.04 LTS: libnss3 2:3.35-2ubuntu2.12
  Ubuntu 16.04 LTS: libnss3 2:3.28.4-0ubuntu0.16.04.14
  Ubuntu 14.04 ESM: libnss3 2:3.28.4-0ubuntu0.14.04.5+esm8
  Ubuntu 12.04 ESM: libnss3 2:3.28.4-0ubuntu0.12.04.11
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