Advisory Details

January 13th, 2022

Microsoft Windows EFI Partition Incorrect Authorization Denial-of-Service Vulnerability

ZDI-22-052
ZDI-CAN-15212

CVE ID CVE-2022-21899
CVSS SCORE 5.5, (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to create a denial-of-service condition on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the Windows kernel. The issue results from improper authorization logic when accessing files in the EFI partition. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21899
DISCLOSURE TIMELINE
  • 2021-10-01 - Vulnerability reported to vendor
  • 2022-01-13 - Coordinated public release of advisory
CREDIT Abdelhamid Naceri
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