VulnerabilityModified
CVE-2020-15705
GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed.
MEDIUM 6.4EPSS 1.39%
Does this matter?
Lower severity and a low EPSS score (1.39%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.4 MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.39% probability · 71th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- gnu/grub2 · redhat/enterprise linux atomic host · redhat/openshift container platform · canonical/ubuntu linux · debian/debian linux · opensuse/leap · redhat/enterprise linux · suse/suse linux enterprise server · microsoft/windows 10 · microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019
- Source
- security@ubuntu.com
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.htmlMailing List, Third Party Advisory
- http://ubuntu.com/security/notices/USN-4432-1Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/03/02/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/grub2bootloaderThird Party Advisory
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlIssue Tracking, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011Patch, Third Party Advisory, Vendor Advisory
- https://security.gentoo.org/glsa/202104-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200731-0008/Third Party Advisory
- https://usn.ubuntu.com/4432-1/Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassThird Party Advisory
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBootThird 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/2020/07/29/3Mailing 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=000019673Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.htmlMailing List, Third Party Advisory
- http://ubuntu.com/security/notices/USN-4432-1Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/03/02/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/grub2bootloaderThird Party Advisory
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlIssue Tracking, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.