CVE-2020-15706
GRUB2 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.
- State
- Published
- Severity
- 6.4 Medium
- Published
- Jul 29, 2020
- Updated
- Sep 16, 2024
- Reserved
- Jul 14, 2020
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.4 Medium | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H | canonical |
Weaknesses
- CWE-362 Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)
Affected Products
| Product | Versions |
|---|---|
grub2 in UbuntuUbuntu |
|
References
- https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassvendor-advisory
- http://ubuntu.com/security/notices/USN-4432-1vendor-advisory
- https://www.debian.org/security/2020-GRUB-UEFI-SecureBootvendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
- https://access.redhat.com/security/vulnerabilities/grub2bootloadervendor-advisory
- https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/vendor-advisory
- https://www.suse.com/support/kb/doc/?id=000019673vendor-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-4735vendor-advisory
- [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilitiesmailing-list
- https://security.netapp.com/advisory/ntap-20200731-0008/
- USN-4432-1vendor-advisory
- openSUSE-SU-2020:1169vendor-advisory
- openSUSE-SU-2020:1168vendor-advisory
- GLSA-202104-05vendor-advisory
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