Memory Management Flaw in GRUB2 Affects System Boot Security
CVE-2020-27779

7.5HIGH

Key Information:

Vendor

Gnu
Status
Grub2
Vendor
CVE Published:
3 March 2021

What is CVE-2020-27779?

A vulnerability in GRUB2 prior to version 2.06 allows privileged attackers to use the cutmem command, potentially bypassing Secure Boot protections. This flaw does not respect secure boot locking mechanisms, enabling attackers to manipulate memory by removing specific address ranges. This presents significant risks to data confidentiality, integrity, and overall system availability.

Affected Version(s)

grub2 grub 2.06

References

https://bugzilla.redhat.com/show_bug.cgi?id=1900698
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202104-05
vendor-advisoryx_refsource_GENTOO

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.