CVE-2019-20908

Sažetak

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

Reference

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
http://www.openwall.com/lists/oss-security/2020/07/20/6
https://usn.ubuntu.com/4427-1/
http://www.openwall.com/lists/oss-security/2020/07/29/3
http://www.openwall.com/lists/oss-security/2020/07/30/2
http://www.openwall.com/lists/oss-security/2020/07/30/3
https://usn.ubuntu.com/4439-1/
https://usn.ubuntu.com/4426-1/
https://usn.ubuntu.com/4440-1/
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html

CVSS

Base:	6.9
Impact:	10.0
Exploitability:	3.4

Pristup

Vektor	Složenost	Autentikacija
LOCAL	MEDIUM	NONE

Impact

Povjerljivost	Cjelovitost	Dostupnost
COMPLETE	COMPLETE	COMPLETE

CVSS vektor

AV:L/AC:M/Au:N/C:C/I:C/A:C

Zadnje važnije ažuriranje

21-07-2021 - 11:39

Objavljeno

15-07-2020 - 22:15