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Vigil@nce - GRUB2: use after free via Function Redefininition

August 2020 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2

SYNTHESIS OF THE VULNERABILITY

Impacted products: 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: 1/4.

Consequences: administrator access/rights, denial of service on
server.

Provenance: physical access.

Confidence: confirmed by the editor (5/5).

Creation date: 30/07/2020.

DESCRIPTION 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.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/GRUB2-use-after-free-via-Function-Redefininition-32957


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