Description

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. 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

https://www.debian.org/security/2020/dsa-4735

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/msg00017.html

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html

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

Details

Risk Information

CVSS v2

CVSS v3