CVE-2018-8219 — Hypervisor Code Integrity Elevation of Privilege Vulnerability

Executive Summary

An elevation of privilege vulnerability exists when Windows Hyper-V instruction emulation fails to properly enforce privilege levels. An attacker who successfully exploited this vulnerability could gain elevated privileges on a target guest operating system. The host operating system is not vulnerable to this attack. This vulnerability by itself does not allow arbitrary code to be run. However, the vulnerability could be used in conjunction with one or more vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running. The update addresses the vulnerability by correcting how privileges are enforced by Windows Hyper-V instruction emulation.

Overview

7.6

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Jun 12 2018

Last Updated Jun 12 2018

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Adjacent

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

High

USER INTERACTION

None

SCOPE

Changed

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.8

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for x64-based Systems	`4284880 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1703 for x64-based Systems	`4284874 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1709 for x64-based Systems	`4284819 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1803 for x64-based Systems	`4284835 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2016	`4284880 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2016 (Server Core installation)	`4284880 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 1709 (Server Core Installation)	`4284819 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 1803 (Server Core Installation)	`4284835 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

4 patches

Article	Type	Restart
`4284880`	Security Update	Yes
`4284874`	Security Update	Yes
`4284819`	Security Update	Yes
`4284835`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Microsoft Hyper-V Development Team
Joe Bialek, MSRC Vulnerabilities and Mitigations Team

References

MSRC Advisory MITRE NVD