#VU51194 Improper Authorization in grub - CVE-2020-27779

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Main Vulnerability Database Vulnerabilities #VU51194

#VU51194 Improper Authorization in grub - CVE-2020-27779

Published: March 3, 2021 / Updated: December 17, 2024


Vulnerability identifier: #VU51194
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-27779
CWE-ID: CWE-285
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
grub
Software vendor:
GNU

Description

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists within the cutmem command, which does not honor the Secure Boot locking. A local privileged user can remove address ranges from memory creating an opportunity to circumvent Secure Boot protections after proper triage about grub's memory layout.


Remediation

Install updates from vendor's repository.

External links