CVE-2020-14372
Description
A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
How to fix
- gnu grub22.06 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu grub2 | v < 2.06 | 2.06 |
| redhat enterprise_linux | 7.0, 8.0 | — |
| redhat enterprise_linux_server_aus | 7.2, 7.3, 7.4, 7.6, 7.7, 8.2 | — |
| redhat enterprise_linux_server_eus | 7.6, 7.7, 8.1 | — |
| redhat enterprise_linux_server_tus | 7.4, 7.6, 7.7, 8.2 | — |
| redhat enterprise_linux_workstation | 7.0 | — |
| fedoraproject fedora | 33, 34 | — |
| netapp cloud_backup | No range specified | — |
| netapp ontap_select_deploy_administration_utility | No range specified | — |
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