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Vulnerability of Firefox/Thunderbird: use after free via MCallGetProperty

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via MCallGetProperty of Firefox, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Debian, Fedora, Firefox, Thunderbird, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 4/4.
Creation date: 09/11/2020.
Références of this computer vulnerability: CERTFR-2020-AVI-721, CERTFR-2020-AVI-742, CVE-2020-26950, DLA-2448-1, DLA-2449-1, DSA-4788-1, DSA-4790-1, FEDORA-2020-cb886fd1b3, FEDORA-2020-fc9085727a, MFSA2020-49, openSUSE-SU-2020:1909-1, openSUSE-SU-2020:1919-1, RHSA-2020:5099-01, RHSA-2020:5100-01, RHSA-2020:5104-01, RHSA-2020:5135-01, RHSA-2020:5138-01, RHSA-2020:5139-01, RHSA-2020:5146-01, RHSA-2020:5162-01, RHSA-2020:5163-01, RHSA-2020:5164-01, RHSA-2020:5166-01, RHSA-2020:5167-01, SUSE-SU-2020:14542-1, SUSE-SU-2020:3311-1, SUSE-SU-2020:3312-1, SUSE-SU-2020:3331-1, SUSE-SU-2020:3418-1, USN-4625-1, VIGILANCE-VUL-33859.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via MCallGetProperty of F...
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This vulnerability impacts software or systems such as Debian, Fedora, Firefox, Thunderbird, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this security announce is critical.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this computer vulnerability note.

Solutions for this threat 

Solutions for this vulnerability are not yet public.
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