CVE-2020-15705

 

Published at: - 29-07-2020 08:15

Last modified: - 22-11-2022 05:52

Total changes: - 9

Description

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://www.suse.com/support/kb/doc/?id=000019673
• http://ubuntu.com/security/notices/USN-4432-1
• https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
• https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
• https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
• https://access.redhat.com/security/vulnerabilities/grub2bootloader
• https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
• https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
• https://www.openwall.com/lists/oss-security/2020/07/29/3
• [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities-Mailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20200731-0008/
• USN-4432-1-Third Party Advisory
• openSUSE-SU-2020:1280-Mailing List, Third Party Advisory
• openSUSE-SU-2020:1282-Mailing List, Third Party Advisory
• [oss-security] 20210302 Multiple GRUB2 vulnerabilities-Mailing List, Third Party Advisory
• GLSA-202104-05-Third Party Advisory
• [oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros list-Mailing List, Third Party Advisory
• [oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros list-Mailing List, Third Party Advisory
• [oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros list-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2020-15705

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures