CVE-2019-20908 Security feature bypass in n/a

What is CVE-2019-20908?

CVE-2019-20908 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 15 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2019-20908?

It affects 3 products.

Products include Canonical Ubuntu Linux, Linux kernel, Opensuse Leap.

How do I fix CVE-2019-20908?

Apply the vendor's patch.

Is CVE-2019-20908 being exploited?

There is no known exploitation of CVE-2019-20908 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-20908, GHSA-8v2w-6qhm-pxp7, UBUNTU-CVE-2019-20908.