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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Ubuntu grub2 in Ubuntu
20.04 LTS to < 2.04-1ubuntu26.1affected18.04 LTS to < 2.02-2ubuntu8.16affected16.04 LTS to < 2.02~beta2-36ubuntu3.26affected14.04 ESM to < 2.02~beta2-9ubuntu1.20affected
References
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ ↗
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass ↗
- http://ubuntu.com/security/notices/USN-4432-1 ↗
- 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.suse.com/c/suse-addresses-grub2-secure-boot-issue/ ↗
- https://www.suse.com/support/kb/doc/?id=000019673 ↗
- https://www.openwall.com/lists/oss-security/2020/07/29/3 ↗
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html ↗
- 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 ↗