CVE-2020-15705 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  Canonical Ltd.
Base Score:  6.4 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory 
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List  Third Party Advisory 
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory 
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue Tracking  Vendor Advisory 
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 Third Party Advisory 
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory 
https://usn.ubuntu.com/4432-1/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory 
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory 
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory 
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing List  Third Party Advisory 
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory 
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-347 Improper Verification of Cryptographic Signature cwe source acceptance level NIST   Reference acceptance level Canonical Ltd.  

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-15705
NVD Published Date:
07/29/2020
NVD Last Modified:
08/29/2020
Source:
Canonical Ltd.