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CVE Vulnerabilities

CVE-2020-15705

Improper Verification of Cryptographic Signature

Published: Jul 29, 2020 | Modified: Nov 21, 2024
CVSS 3.x
6.4
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
4.4 MEDIUM
AV:L/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
6.4 MODERATE
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-15705
CWEhttps://cwe.mitre.org/data/definitions/347.html

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.

Weakness

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Affected Software

NameVendorStart VersionEnd Version
Grub2Gnu*2.04 (including)
Red Hat Enterprise Linux 7RedHatfwupdate-0:12-6.el7_8*
Red Hat Enterprise Linux 7RedHatgrub2-1:2.02-0.86.el7_8*
Red Hat Enterprise Linux 7RedHatshim-0:15-7.el7_9*
Red Hat Enterprise Linux 7RedHatshim-signed-0:15-7.el7_8*
Red Hat Enterprise Linux 7.2 Advanced Update SupportRedHatgrub2-1:2.02-0.86.el7_2*
Red Hat Enterprise Linux 7.2 Advanced Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.2 Advanced Update SupportRedHatshim-signed-0:15-8.el7_2*
Red Hat Enterprise Linux 7.3 Advanced Update SupportRedHatgrub2-1:2.02-0.86.el7*
Red Hat Enterprise Linux 7.3 Advanced Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.3 Advanced Update SupportRedHatshim-signed-0:15-8.el7_3*
Red Hat Enterprise Linux 7.3 Telco Extended Update SupportRedHatgrub2-1:2.02-0.86.el7*
Red Hat Enterprise Linux 7.3 Telco Extended Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.3 Telco Extended Update SupportRedHatshim-signed-0:15-8.el7_3*
Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsRedHatgrub2-1:2.02-0.86.el7*
Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsRedHatshim-signed-0:15-8.el7_3*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatfwupdate-0:9-10.el7_4*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatgrub2-1:2.02-0.86.el7_4*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.4 Advanced Update SupportRedHatshim-signed-0:15-8.el7_4*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatfwupdate-0:9-10.el7_4*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatgrub2-1:2.02-0.86.el7_4*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.4 Telco Extended Update SupportRedHatshim-signed-0:15-8.el7_4*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatfwupdate-0:9-10.el7_4*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatgrub2-1:2.02-0.86.el7_4*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsRedHatshim-signed-0:15-8.el7_4*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatfwupdate-0:12-6.el7_6*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatgrub2-1:2.02-0.86.el7_6*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.6 Extended Update SupportRedHatshim-signed-0:15-8.el7_6*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatfwupdate-0:12-6.el7_7*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatgrub2-1:2.02-0.86.el7_7*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatshim-0:15-8.el7*
Red Hat Enterprise Linux 7.7 Extended Update SupportRedHatshim-signed-0:15-8.el7_7*
Red Hat Enterprise Linux 8RedHatfwupd-0:1.1.4-7.el8_2*
Red Hat Enterprise Linux 8RedHatgrub2-1:2.02-87.el8_2*
Red Hat Enterprise Linux 8RedHatshim-0:15-14.el8_2*
Red Hat Enterprise Linux 8RedHatshim-unsigned-x64-0:15-7.el8*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatfwupd-0:1.1.4-2.el8_0*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatgrub2-1:2.02-87.el8_0*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatshim-0:15-14.el8_0*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatfwupd-0:1.1.4-2.el8_1*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatgrub2-1:2.02-87.el8_1*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatshim-0:15-14.el8_1*
Red Hat Enterprise Linux 8.1 Extended Update SupportRedHatshim-unsigned-x64-0:15-7.el8*
Grub2Ubuntubionic*
Grub2Ubuntuesm-infra-legacy/trusty*
Grub2Ubuntuesm-infra/bionic*
Grub2Ubuntuesm-infra/focal*
Grub2Ubuntuesm-infra/xenial*
Grub2Ubuntufocal*
Grub2Ubuntuprecise/esm*
Grub2Ubuntutrusty*
Grub2Ubuntutrusty/esm*
Grub2Ubuntuxenial*
Grub2-signedUbuntubionic*
Grub2-signedUbuntueoan*
Grub2-signedUbuntuesm-infra-legacy/trusty*
Grub2-signedUbuntuesm-infra/bionic*
Grub2-signedUbuntuesm-infra/focal*
Grub2-signedUbuntuesm-infra/xenial*
Grub2-signedUbuntufocal*
Grub2-signedUbuntutrusty*
Grub2-signedUbuntutrusty/esm*
Grub2-signedUbuntuxenial*
Grub2-unsignedUbuntuesm-infra/xenial*
Grub2-unsignedUbuntutrusty*
Grub2-unsignedUbuntuxenial*

References

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