HIGH 7.5 Microsoft
CVE-2020-14372
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.
Microsoft Security Update 2021-Mar: 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.
Affected Products
- cm1 grub2 2.06~rc1-4 on CBL Mariner 1.0
- cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-14372
- https://nvd.nist.gov/vuln/detail/CVE-2020-14372
This high severity vulnerability with a CVSS score of 7.5 was published on 2021-03-09 via Microsoft. Affected: cm1 grub2 2.06~rc1-4 on CBL Mariner 1.0, cbl2 grub2 2.06~rc1-7 on CBL Mariner 2.0.
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