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Vulnerability of GRUB2: use after free via Function Redefininition

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via Function Redefininition of GRUB2, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Debian, Windows 10, Windows 2012, Windows 2016, Windows 2019, Windows 8, Windows RT, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive.
Severity of this alert: 1/4.
Creation date: 30/07/2020.
Références of this alert: ADV200011, CERTFR-2020-AVI-475, CERTFR-2020-AVI-476, CERTFR-2020-AVI-477, CERTFR-2020-AVI-485, CVE-2020-15706, DSA-4735-1, DSA-4735-2, openSUSE-SU-2020:1168-1, openSUSE-SU-2020:1169-1, RHSA-2020:3216-01, RHSA-2020:3217-01, RHSA-2020:3223-01, RHSA-2020:3227-01, RHSA-2020:3271-01, RHSA-2020:3273-01, RHSA-2020:3274-01, RHSA-2020:3275-01, RHSA-2020:3276-01, SUSE-SU-2020:14440-1, SUSE-SU-2020:2073-1, SUSE-SU-2020:2074-1, SUSE-SU-2020:2076-1, SUSE-SU-2020:2077-1, SUSE-SU-2020:2078-1, SUSE-SU-2020:2079-1, USN-4432-1, USN-4432-2, VIGILANCE-VUL-32957.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via Function Redefininiti...
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This computer vulnerability bulletin impacts software or systems such as Debian, Windows 10, Windows 2012, Windows 2016, Windows 2019, Windows 8, Windows RT, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive.

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

The trust level is of type confirmed by the editor, with an origin of physical access.

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

Solutions for this threat 

This vulnerability workaround will be public soon.
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