CVE-2020-15706GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
• https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass vendor-advisory
• http://ubuntu.com/security/notices/USN-4432-1 vendor-advisory
• https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot vendor-advisory
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
• https://access.redhat.com/security/vulnerabilities/grub2bootloader vendor-advisory
• https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ vendor-advisory
• https://www.suse.com/support/kb/doc/?id=000019673 vendor-advisory
• https://www.openwall.com/lists/oss-security/2020/07/29/3
• https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
• DSA-4735 vendor-advisory
• [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities mailing-list
• https://security.netapp.com/advisory/ntap-20200731-0008/
• USN-4432-1 vendor-advisory
• openSUSE-SU-2020:1169 vendor-advisory
• openSUSE-SU-2020:1168 vendor-advisory
• GLSA-202104-05 vendor-advisory