CVE-2020-15706
MEDIUM severity · CVSS 6.4 · CWE-362
6.4CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityHigh
Privileges requiredHigh
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 ↗
Additional information
- NVD record
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011Patch
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlAdvisory
- http://ubuntu.com/security/notices/USN-4432-1Advisory
- http://www.openwall.com/lists/oss-security/2020/07/29/3Advisory
- https://access.redhat.com/security/vulnerabilities/grub2bootloaderAdvisory
- https://security.gentoo.org/glsa/202104-05Advisory