CVE-2018-8566 — BitLocker Security Feature Bypass Vulnerability

Executive Summary

A security feature bypass vulnerability exists when Windows improperly suspends BitLocker Device Encryption. An attacker with physical access to a powered off system could exploit this vulnerability to gain access to encrypted data. To exploit the vulnerability, an attacker must gain physical access to the target system prior to the next system reboot. The security update fixes the vulnerability by ensuring Windows resumes BitLocker Device Encryption.

Overview

4.6

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Nov 13 2018

Last Updated Nov 13 2018

Publicly Disclosed Yes

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Physical

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

Temporal Score: 4.6

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

19 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`4465659 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for x64-based Systems	`4465659 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1703 for 32-bit Systems	`4465660 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1703 for x64-based Systems	`4465660 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1709 for 32-bit Systems	`4465661 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4465661 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1709 for x64-based Systems	`4465661 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for 32-bit Systems	`4465663 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4465663 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for x64-based Systems	`4465663 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for 32-bit Systems	`4465664 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4465664 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for x64-based Systems	`4465664 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016	`4465659 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`4465659 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`4465664 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`4465664 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1709 (Server Core Installation)	`4465661 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1803 (Server Core Installation)	`4465663 (Servicing Stack Update)`	Important	Security Feature Bypass	Yes

Patches

5 patches

Article	Type	Restart
`4465659`	Servicing Stack Update	Yes
`4465660`	Servicing Stack Update	Yes
`4465661`	Servicing Stack Update	Yes
`4465663`	Servicing Stack Update	Yes
`4465664`	Servicing Stack 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

None

References

MSRC Advisory MITRE NVD