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.
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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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
- http://ubuntu.com/security/notices/USN-4432-1
- https://access.redhat.com/security/vulnerabilities/grub2bootloader
- https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
References (17)
CVSS
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- HIGH
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
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