CVE-2024-23593: Lenovo: CVE-2024-23593 Modify Boot Manager and Escalate Privileges

Overview

Severity
Medium (CVSS 6.7)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Security Feature Bypass
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2024-Apr
Released
2024-04-09
Last Updated
2024-05-14
EPSS Score
0.04% (percentile: 13.4%)

FAQ

What kind of security feature could be bypassed by successfully exploiting this vulnerability? An attacker who successfully exploited this vulnerability could bypass Secure Boot. Why is this Lenovo CVE included in the Security Update Guide? The vulnerability assigned to this CVE is in certain Lenovo bootloaders. The mitigation for this vulnerability requires a Windows update. This CVE is being documented in the Security Update Guide to announce that the latest builds of Windows enable the mitigation and provide protection against the vulnerability. Please see the following for more information: LEN-132277 Are there additional steps I need to take to be protected from this vulnerability? All customers should apply the April 9, 2024 Windows security updates. These security updates address this vulnerability by updating the Windows Boot Manager and other components, but the protections are not enabled by default. Additional steps are required at this time to mitigate this vulnerability. Please refer to KB5025885: How to manage the Windows Boot Manager revocations for Secure Boot changes associated with CVE-2023-24932. This article describes the protection against this Secure Boot security feature bypass, how to enable the protections, and guidance to update bootable media.

Affected Products (20)

Windows

  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows 11 version 21H2 for x64-based Systems
  • Windows 11 version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for x64-based Systems
  • Windows 11 Version 22H2 for ARM64-based Systems
  • Windows 11 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for ARM64-based Systems
  • Windows 10 Version 22H2 for 32-bit Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)

Security Updates (6)

Acknowledgments

Zammis Clark

Revision History

  • 2024-04-09: Information published.
  • 2024-05-14: Updated CVE title and CVSS scores per request from CNA (Lenovo). This is an informational change only.