Vulnerability Details : CVE-2019-20908
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.
Products affected by CVE-2019-20908
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-20908
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 14 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-20908
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST |
References for CVE-2019-20908
-
http://www.openwall.com/lists/oss-security/2020/07/30/2
oss-security - UEFI SecureBoot bypass fixes rolled out to kernels below radarMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4427-1/
USN-4427-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://usn.ubuntu.com/4426-1/
USN-4426-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html
[oss-security] lockdown bypass on ubuntu 18.04's 4.15 kernel for loading unsigned modulesMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/07/29/3
oss-security - multiple secure boot grub2 and linux kernel vulnerabilitiesMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/07/30/3
oss-security - Re: UEFI SecureBoot bypass fixes rolled out to kernels below radarMailing List;Third Party Advisory
-
https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh
american-unsigned-language.sh - american-unsigned-language - Disable kernel lockdown using ACPI SSDT injectionPatch;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/07/20/6
oss-security - Re: Re: lockdown bypass on ubuntu 18.04's 4.15 kernel for loading unsigned modulesMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4439-1/
USN-4439-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4
Release Notes;Vendor Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
[security-announce] openSUSE-SU-2020:1153-1: important: Security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4440-1/
USN-4440-1: linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
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