Windows Hyper-V
CVE-2018-8435 — Windows Hyper-V Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass vulnerability exists when Windows Hyper-V BIOS loader fails to provide a high-entropy source. To exploit this vulnerability, an attacker would need to reboot a guest virtual machine numerous times until the vulnerability is triggered. The security update addresses the vulnerability by correcting security feature behavior to ensure Windows Hyper-V BIOS loader provides a high-entropy source.
Overview
4.2
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Adjacent
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
High
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 3.8
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
9 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for x64-based Systems | 4457132 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4457131 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4457138 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4457142 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4457128 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 | 4457131 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4457131 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4457142 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4457128 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
5 patches
| Article | Type | Restart |
|---|---|---|
4457132 |
Security Update | Yes |
4457131 |
Security Update | Yes |
4457138 |
Security Update | Yes |
4457142 |
Security Update | Yes |
4457128 |
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
Niels Ferguson of Microsoft Corporation
References
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