CVE-2019-20908

medium

Description

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.

References

https://usn.ubuntu.com/4440-1/

https://usn.ubuntu.com/4439-1/

https://usn.ubuntu.com/4427-1/

https://usn.ubuntu.com/4426-1/

https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html

https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4

http://www.openwall.com/lists/oss-security/2020/07/30/3

http://www.openwall.com/lists/oss-security/2020/07/30/2

http://www.openwall.com/lists/oss-security/2020/07/29/3

http://www.openwall.com/lists/oss-security/2020/07/20/6

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html

Details

Source: Mitre, NVD

Published: 2020-07-15

Updated: 2021-07-21

Risk Information

CVSS v2

Base Score: 6.9

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 6.7

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H