Advisory Details

August 18th, 2022

(Pwn2Own) Microsoft Windows vhdmp Driver Improper Authorization Privilege Escalation Vulnerability

ZDI-22-1070
ZDI-CAN-17429

CVE ID CVE-2022-35751
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges 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 vhdmp.sys driver. The issue results from improper authorization logic when accessing VHD files. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of 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-2022-35751
DISCLOSURE TIMELINE
  • 2022-05-25 - Vulnerability reported to vendor
  • 2022-08-18 - Coordinated public release of advisory
CREDIT Phan Thanh Duy (@PTDuy), Le Huu Quang Linh (@linhlhq) of STAR Labs
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