CVE-2020-15705

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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.

References

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

http://www.openwall.com/lists/oss-security/2020/07/29/3

https://security.netapp.com/advisory/ntap-20200731-0008/

https://usn.ubuntu.com/4432-1/

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html

http://www.openwall.com/lists/oss-security/2021/03/02/3

https://security.gentoo.org/glsa/202104-05

http://www.openwall.com/lists/oss-security/2021/09/17/2

http://www.openwall.com/lists/oss-security/2021/09/17/4

http://www.openwall.com/lists/oss-security/2021/09/21/1

Details

Source: MITRE

Published: 2020-07-29

Updated: 2021-09-21

Type: CWE-347

Risk Information

CVSS v2

Base Score: 4.4

Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 6.4

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

Impact Score: 5.9

Exploitability Score: 0.5

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* versions up to 2.04 (inclusive)

Configuration 2

OR

cpe:2.3:a:redhat:enterprise_linux_atomic_host:-:*:*:*:*:*:*:*

cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:o:suse:suse_linux_enterprise_server:11:*:*:*:*:*:*:*

cpe:2.3:o:suse:suse_linux_enterprise_server:12:*:*:*:*:*:*:*

cpe:2.3:o:suse:suse_linux_enterprise_server:15:*:*:*:*:*:*:*

Configuration 3

OR

cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

Tenable Plugins

View all (31 total)

IDNameProductFamilySeverity
154470NewStart CGSL CORE 5.05 / MAIN 5.05 : grub2 Multiple Vulnerabilities (NS-SA-2021-0139)NessusNewStart CGSL Local Security Checks
medium
150591SUSE SLES11 Security Update : grub2 (SUSE-SU-2020:14461-1)NessusSuSE Local Security Checks
medium
149217GLSA-202104-05 : GRUB: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
147274NewStart CGSL CORE 5.04 / MAIN 5.04 : grub2 Multiple Vulnerabilities (NS-SA-2021-0008)NessusNewStart CGSL Local Security Checks
medium
146030CentOS 8 : grub2 (CESA-2020:3216)NessusCentOS Local Security Checks
medium
140948EulerOS Virtualization for ARM 64 3.0.6.0 : grub2 (EulerOS-SA-2020-2000)NessusHuawei Local Security Checks
medium
140075openSUSE Security Update : grub2 (openSUSE-2020-1282)NessusSuSE Local Security Checks
medium
140074openSUSE Security Update : grub2 (openSUSE-2020-1280)NessusSuSE Local Security Checks
medium
139843SUSE SLES12 Security Update : grub2 (SUSE-SU-2020:2308-1)NessusSuSE Local Security Checks
medium
139842SUSE SLED15 / SLES15 Security Update : grub2 (SUSE-SU-2020:2307-1)NessusSuSE Local Security Checks
medium
139841SUSE SLED15 / SLES15 Security Update : grub2 (SUSE-SU-2020:2306-1)NessusSuSE Local Security Checks
medium
139840SUSE SLES12 Security Update : grub2 (SUSE-SU-2020:2305-1)NessusSuSE Local Security Checks
medium
139839SUSE SLES12 Security Update : grub2 (SUSE-SU-2020:2304-1)NessusSuSE Local Security Checks
medium
139838SUSE SLES15 Security Update : grub2 (SUSE-SU-2020:2303-1)NessusSuSE Local Security Checks
medium
139365Ubuntu 16.04 LTS / 18.04 LTS / 20.04 : GRUB2 regression (USN-4432-2)NessusUbuntu Local Security Checks
medium
139294RHEL 7 : grub2 (RHSA-2020:3274)NessusRed Hat Local Security Checks
medium
139288RHEL 7 : grub2 (RHSA-2020:3271)NessusRed Hat Local Security Checks
medium
139287RHEL 7 : grub2 (RHSA-2020:3276)NessusRed Hat Local Security Checks
medium
139284RHEL 7 : grub2 (RHSA-2020:3273)NessusRed Hat Local Security Checks
medium
139283RHEL 7 : grub2 (RHSA-2020:3275)NessusRed Hat Local Security Checks
medium
139243Photon OS 2.0: Grub2 PHSA-2020-2.0-0267NessusPhotonOS Local Security Checks
medium
139242Photon OS 1.0: Grub2 PHSA-2020-1.0-0311NessusPhotonOS Local Security Checks
medium
139239Windows Security Feature Bypass in Secure Boot (BootHole)NessusWindows
medium
139236CentOS 7 : grub2 (CESA-2020:3217)NessusCentOS Local Security Checks
medium
139198RHEL 7 : grub2 (RHSA-2020:3217)NessusRed Hat Local Security Checks
medium
139194RHEL 8 : grub2 (RHSA-2020:3216)NessusRed Hat Local Security Checks
medium
139193RHEL 8 : grub2 (RHSA-2020:3223)NessusRed Hat Local Security Checks
medium
139192RHEL 8 : grub2 (RHSA-2020:3227)NessusRed Hat Local Security Checks
medium
139179Ubuntu 16.04 LTS / 18.04 LTS / 20.04 : GRUB 2 vulnerabilities (USN-4432-1)NessusUbuntu Local Security Checks
medium
139165Oracle Linux 8 : grub2 (ELSA-2020-5786)NessusOracle Linux Local Security Checks
critical
139164Oracle Linux 7 : grub2 (ELSA-2020-5782)NessusOracle Linux Local Security Checks
critical