Improper Verification of Cryptographic Signature Affecting grub2-signed package, versions <1.34.22
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Test your applications- Snyk ID SNYK-UBUNTU1404-GRUB2SIGNED-596059
- published 29 Jul 2020
- disclosed 29 Jul 2020
Introduced: 29 Jul 2020
CVE-2020-15705 Open this link in a new tabHow to fix?
Upgrade Ubuntu:14.04 grub2-signed to version 1.34.22 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream grub2-signed package and not the grub2-signed package as distributed by Ubuntu.
See How to fix? for Ubuntu:14.04 relevant fixed versions and status.
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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2020-15705
- https://security-tracker.debian.org/tracker/CVE-2020-15705
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
- https://security.netapp.com/advisory/ntap-20200731-0008/
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
- https://www.openwall.com/lists/oss-security/2020/07/29/3
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
- https://security.gentoo.org/glsa/202104-05
- http://www.openwall.com/lists/oss-security/2020/07/29/3
- http://www.openwall.com/lists/oss-security/2021/03/02/3
- 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
- https://access.redhat.com/security/vulnerabilities/grub2bootloader
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html
- https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
- https://www.suse.com/support/kb/doc/?id=000019673
- https://usn.ubuntu.com/4432-1/
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
- http://ubuntu.com/security/notices/USN-4432-1