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Vulnerability · Published Mar 3, 2021 · Assigned by redhat

CVE-2020-25647

High 7.6

In plain English

A high-severity out-of-bounds write in grub2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.6High
Exploit odds (30 days)0.8%top 43.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8shim-aa6415.4-2.el8_1.almaALSA-2021:1734
AlmaLinux:8shim-ia3215.4-2.el8_1.almaALSA-2021:1734
AlmaLinux:8shim-unsigned-aarch6415-7.el8_1.almaALSA-2021:1734
AlmaLinux:8shim-unsigned-x6415.4-4.el8_1.almaALSA-2021:1734
AlmaLinux:8shim-x6415.4-2.el8_1.almaALSA-2021:1734
Alpine:v3.20grub2.06-r0ALPINE-CVE-2020-25647
Alpine:v3.21grub2.06-r0ALPINE-CVE-2020-25647
Alpine:v3.22grub2.06-r0ALPINE-CVE-2020-25647
Alpine:v3.23grub2.06-r0ALPINE-CVE-2020-25647
Alpine:v3.24grub2.06-r0ALPINE-CVE-2020-25647
Debian:12grub22.04-16DEBIAN-CVE-2020-25647
Debian:13grub22.04-16DEBIAN-CVE-2020-25647
Debian:14grub22.04-16DEBIAN-CVE-2020-25647
Rocky Linux:8fwupd0:1.5.9-1.el8_4RLSA-2021:2566
Rocky Linux:8shim-unsigned-aarch640:15-7.el8.1.1RLSA-2021:1734

Affected products (as reported)

VendorProductVersions
n/a grub2 grub 2.06

Weakness: CWE-787

References