high
7.5
CWE
184
Advisory Published
CVE Published
Updated

CVE-2020-14372

First published: Thu Aug 27 2020(Updated: )

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.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/grub<2.06
2.06
GRUB 2<2.06
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
redhat enterprise Linux server aus=7.2
redhat enterprise Linux server aus=7.3
redhat enterprise Linux server aus=7.4
redhat enterprise Linux server aus=7.6
redhat enterprise Linux server aus=7.7
redhat enterprise Linux server aus=8.2
redhat enterprise Linux server eus=7.6
redhat enterprise Linux server eus=7.7
redhat enterprise Linux server eus=8.1
redhat enterprise Linux server tus=7.4
redhat enterprise Linux server tus=7.6
redhat enterprise Linux server tus=7.7
redhat enterprise Linux server tus=8.2
redhat enterprise Linux workstation=7.0
Fedora=33
Fedora=34
netapp cloud backup
NetApp ONTAP Select Deploy

Remedy

https://access.redhat.com/security/vulnerabilities/RHSB-2021-003

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-14372?

    CVE-2020-14372 is a vulnerability in grub2 prior to version 2.06 that enables the usage of the ACPI command when Secure Boot is enabled.

  • What is the severity of CVE-2020-14372?

    The severity of CVE-2020-14372 is high with a CVSS score of 7.5.

  • How does CVE-2020-14372 affect Red Hat Enterprise Linux?

    CVE-2020-14372 affects Red Hat Enterprise Linux versions 7.0, 7.2, 7.3, 7.4, 7.6, 7.7, 8.0, 8.1, and 8.2.

  • How can I fix CVE-2020-14372?

    To fix CVE-2020-14372, update grub2 to version 2.06.

  • Where can I find more information about CVE-2020-14372?

    You can find more information about CVE-2020-14372 at the following references: [Reference 1](https://access.redhat.com/security/vulnerabilities/RHSB-2021-003), [Reference 2](https://bugzilla.redhat.com/show_bug.cgi?id=1873150), [Reference 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/).

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