Upstream information

CVE-2021-3418 at MITRE

Description

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 4.4
Vector AV:L/AC:M/Au:N/C:P/I:P/A:P
Access Vector Local
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 6.4 6.4
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Access Vector Local Local
Access Complexity High High
Privileges Required High High
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1

Note from the SUSE Security Team

This issue does not affect SUSE Linux Enterprise or openSUSE, as it exists only in newer grub2 versions.

SUSE Bugzilla entry: 1182890 [RESOLVED / UPSTREAM]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
HPE Helion OpenStack 8 grub2 Not affected
SLES15-EC2-CHOST-HVM-BYOS grub2 Not affected
SLES15-SP1-CHOST-BYOS-Azure grub2 Not affected
SLES15-SP1-CHOST-BYOS-EC2 grub2 Not affected
SLES15-SP1-CHOST-BYOS-GCE grub2 Not affected
SLES15-SP2-CHOST-BYOS-Aliyun grub2 Analysis
SLES15-SP2-CHOST-BYOS-Azure grub2 Analysis
SLES15-SP2-CHOST-BYOS-EC2 grub2 Analysis
SLES15-SP2-CHOST-BYOS-GCE grub2 Analysis
SLES15-SP3-CHOST-BYOS-Aliyun grub2 Analysis
SLES15-SP3-CHOST-BYOS-Azure grub2 Analysis
SLES15-SP3-CHOST-BYOS-EC2 grub2 Analysis
SLES15-SP3-CHOST-BYOS-GCE grub2 Analysis
SUSE CaaS Platform 4.0 grub2 Not affected
SUSE Enterprise Storage 6 grub2 Not affected
SUSE Linux Enterprise Desktop 15 SP2 grub2 Not affected
SUSE Linux Enterprise High Performance Computing 12 SP5 grub2 Not affected
SUSE Linux Enterprise High Performance Computing 15 LTSS grub2 Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS grub2 Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 grub2 Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 grub2 Not affected
SUSE Linux Enterprise Module for Server Applications 15 SP2 grub2 Not affected
SUSE Linux Enterprise Point of Service Image Server 12 SP2 grub2 Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS grub2 Not affected
SUSE Linux Enterprise Server 12 SP2 BCL grub2 Not affected
SUSE Linux Enterprise Server 12 SP2 ESPOS grub2 Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS grub2 Not affected
SUSE Linux Enterprise Server 12 SP3 BCL grub2 Not affected
SUSE Linux Enterprise Server 12 SP3 ESPOS grub2 Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS grub2 Not affected
SUSE Linux Enterprise Server 12 SP4 ESPOS grub2 Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS grub2 Not affected
SUSE Linux Enterprise Server 12 SP5 grub2 Not affected
SUSE Linux Enterprise Server 15 ESPOS grub2 Not affected
SUSE Linux Enterprise Server 15 LTSS grub2 Not affected
SUSE Linux Enterprise Server 15 SP1 LTSS grub2 Not affected
SUSE Linux Enterprise Server 15 SP2 grub2 Not affected
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 grub2 Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 grub2 Not affected
SUSE Linux Enterprise Storage 7 grub2 Not affected
SUSE Manager Proxy 4.0 grub2 Not affected
SUSE Manager Proxy 4.1 grub2 Not affected
SUSE Manager Retail Branch Server 4.0 grub2 Not affected
SUSE Manager Retail Branch Server 4.1 grub2 Not affected
SUSE Manager Server 4.0 grub2 Not affected
SUSE Manager Server 4.1 grub2 Not affected
SUSE OpenStack Cloud 7 grub2 Not affected
SUSE OpenStack Cloud 8 grub2 Not affected
SUSE OpenStack Cloud 9 grub2 Not affected
SUSE OpenStack Cloud Crowbar 8 grub2 Not affected
SUSE OpenStack Cloud Crowbar 9 grub2 Not affected
suse/sle-micro-rancher/5.2 grub2Analysis