CVE-2020-14372: fedoraproject fedora Incomplete List of Disallowed Inputs

Vulnerability summary

CVE-2020-14372 is a high (CVSS 7.5) Incomplete List of Disallowed Inputs vulnerability in fedoraproject fedora. EPSS estimates a 1.74% chance of exploitation in the next 30 days, higher than 77.3% of scored vulnerabilities.

Timeline

1. 03-03-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-184Incomplete List of Disallowed InputsThe product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.