Vigil@nce - GRUB2: buffer overflow via grub_squash_read_symlink
August 2020 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulne...
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.
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 trigger a buffer overflow via grub_squash_read_symlink() of GRUB2, in order to trigger a denial of service, and possibly to run code.
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