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zdiPhan Thanh Duy (@PTDuy), Le Huu Quang Linh (@linhlhq) of STAR LabsZDI-22-1070
HistoryAug 18, 2022 - 12:00 a.m.

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

2022-08-1800:00:00
Phan Thanh Duy (@PTDuy), Le Huu Quang Linh (@linhlhq) of STAR Labs
www.zerodayinitiative.com
21

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

3.5 Low

CVSS2

Access Vector

LOCAL

Access Complexity

HIGH

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:H/Au:S/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

48.6%

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.

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

3.5 Low

CVSS2

Access Vector

LOCAL

Access Complexity

HIGH

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:H/Au:S/C:P/I:P/A:P

0.001 Low

EPSS

Percentile

48.6%