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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.
Severity of this computer vulnerability: 1/4.
Creation date: 05/05/2021.
Références of this announce: CERTFR-2021-AVI-340, CVE-2021-29951, FEDORA-2021-8ef98a68b9, MFSA2021-18, MFSA2021-19, 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.

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 

This vulnerability patch will be public soon.
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