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CVE-2020-27779

Date: March 3, 2021

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity Score

Related Resources (11)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://nvd.nist.gov/vuln/detail/CVE-2020-27779
https://security.gentoo.org/glsa/202104-05
https://access.redhat.com/security/cve/CVE-2020-27779
https://bugzilla.redhat.com/show_bug.cgi?id=1900698
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-27779
https://security-tracker.debian.org/tracker/CVE-2020-27779
https://security.netapp.com/advisory/ntap-20220325-0001/
https://security.alpinelinux.org/vuln/CVE-2020-27779
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://www.mend.io/vulnerability-database/CVE-2020-27779

Severity Score

Weakness Type (CWE)

Improper Authorization

CWE-285

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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