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Vulnerability of Mozilla Firefox and Thunderbird on Windows: privilege escalation via the upgrade service

Synthesis of the vulnerability 

An attacker can tamper with the upgrade service of Mozilla Firefox on Windows.
Impacted software: Fedora, Firefox, Thunderbird, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this computer vulnerability: 1/4.
Creation date: 05/05/2021.
Références of this announce: CERTFR-2021-AVI-340, CVE-2021-29951, FEDORA-2021-38e1f87ac3, FEDORA-2021-8ef98a68b9, FEDORA-2021-8f13872334, MFSA2021-18, MFSA2021-19, openSUSE-SU-2021:0858-1, PROJ-ZERO-2148, SUSE-SU-2021:14743-1, SUSE-SU-2021:1854-1, SUSE-SU-2021:1884-1, SUSE-SU-2021:1886-1, SUSE-SU-2021:1919-1, VIGILANCE-VUL-35242.

Description of the vulnerability 

An attacker can tamper with the upgrade service of Mozilla Firefox on Windows.
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This threat alert impacts software or systems such as Fedora, Firefox, Thunderbird, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this weakness note.

Solutions for this threat 

Fedora 32: new thunderbird packages.
New packages are available:
  Fedora 32: thunderbird 78.10.1-1.fc32

Fedora 33: new thunderbird packages.
New packages are available:
  Fedora 33: thunderbird 78.10.1-1.fc33

Fedora 34: new thunderbird packages.
New packages are available:
  Fedora 34: thunderbird 78.10.1-1.fc34

Mozilla Firefox: version 78.10.1.
The version 78.10.1 is fixed:
  https://www.mozilla.org/fr/firefox/all/#product-desktop-esr

Mozilla Thunderbird: version 78.10.1.
The version 78.10.1 is fixed:
  https://www.thunderbird.net/en-US/thunderbird/all/

openSUSE Leap 15.2: new MozillaFirefox packages.
New packages are available:
  openSUSE Leap 15.2: MozillaFirefox 78.11.0-lp152.2.58.1

SUSE LE 11 SP4: new MozillaFirefox packages.
New packages are available:
  SUSE LE 11 SP4: MozillaFirefox 78.11.0-78.131.1

SUSE LE 12 SP2-5: new MozillaFirefox packages.
New packages are available:
  SUSE LE 12 SP2: MozillaFirefox 78.11.0-112.62.1
  SUSE LE 12 SP3: MozillaFirefox 78.11.0-112.62.1
  SUSE LE 12 SP4: MozillaFirefox 78.11.0-112.62.1
  SUSE LE 12 SP5: MozillaFirefox 78.11.0-112.62.1

SUSE LE 15 RTM-SP1: new MozillaFirefox packages.
New packages are available:
  SUSE LE 15 RTM: MozillaFirefox 78.11.0-3.144.1
  SUSE LE 15 SP1: MozillaFirefox 78.11.0-3.144.1

SUSE LE 15 SP2-3: new MozillaFirefox packages.
New packages are available:
  SUSE LE 15 SP2: MozillaFirefox 78.11.0-8.43.1
  SUSE LE 15 SP3: MozillaFirefox 78.11.0-8.43.1

SUSE LE 15 SP2-3: new MozillaThunderbird packages.
New packages are available:
  SUSE LE 15 SP2: MozillaThunderbird 78.10.2-8.27.1
  SUSE LE 15 SP3: MozillaThunderbird 78.10.2-8.27.1
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