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CVE-2020-15706

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Date: July 29, 2020

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.

Language: C

Severity Score

Related Resources (20)

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
http://ubuntu.com/security/notices/USN-4432-1
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
https://security.gentoo.org/glsa/202104-05
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
https://access.redhat.com/security/vulnerabilities/grub2bootloader
https://security.netapp.com/advisory/ntap-20200731-0008/
https://usn.ubuntu.com/4432-1/
https://nvd.nist.gov/vuln/detail/CVE-2020-15706
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.suse.com/support/kb/doc/?id=000019673
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
https://www.debian.org/security/2020/dsa-4735
http://www.openwall.com/lists/oss-security/2020/07/29/3
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
https://access.redhat.com/security/cve/CVE-2020-15706
https://www.mend.io/vulnerability-database/CVE-2020-15706

Severity Score

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

Use After Free

CWE-416

Top Fix

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Upgrade Version

Upgrade to version grub - no_fix;grub-efi - no_fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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