CVE-2020-15706 - CVE House
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Status published Medium 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.

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Chris Coulson

References

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Affected Vendor

Affected Software

grub2 in Ubuntu
Vulnerable Versions:
20.04 LTS, 18.04 LTS, 16.04 LTS, 14.04 ESM

Timeline

Official Publish: July 29th, 2020
Last Modified: September 16th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-362

MITRE ATT&CK TTPs

T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1574 Hijack Execution Flow
Persistence
T1565 Data Manipulation
Impact
T1499 Endpoint Denial of Service
Impact
T1190 Exploit Public-Facing Application
Initial Access