Microsoft Windows
CVE-2018-8549 — Windows Security Feature Bypass Vulnerability
Executive Summary
A security feature bypass exists when Windows incorrectly validates kernel driver signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed drivers into the kernel. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed drivers from being loaded by the kernel. The update addresses the vulnerability by correcting how Windows validates kernel driver signatures.
Overview
5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
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: 5.0
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4467680 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 for x64-based Systems | 4467680 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4467691 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4467691 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4467696 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4467696 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4467686 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4467686 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4467686 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4467702 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4467702 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4467702 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4467708 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4467708 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4467708 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 8.1 for 32-bit systems 4467697 (Monthly Rollup) 4467703 (Security Only) Important Security Feature Bypass 4462926 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4467697 (Monthly Rollup) 4467703 (Security Only) Important Security Feature Bypass 4462926 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows RT 8.1 | 4467697 (Monthly Rollup) |
Important | Security Feature Bypass | Yes |
| Windows Server 2012 4467701 (Monthly Rollup) 4467678 (Security Only) Important Security Feature Bypass 4462929 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4467701 (Monthly Rollup) 4467678 (Security Only) Important Security Feature Bypass 4462929 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4467697 (Monthly Rollup) 4467703 (Security Only) Important Security Feature Bypass 4462926 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4467697 (Monthly Rollup) 4467703 (Security Only) Important Security Feature Bypass 4462926 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4467691 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 4467691 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 | 4467708 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 (Server Core installation) | 4467708 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4467686 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4467702 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4467680 |
Security Update | Yes |
4467691 |
Security Update | Yes |
4467696 |
Security Update | Yes |
4467686 |
Security Update | Yes |
4467702 |
Security Update | Yes |
4467708 |
Security Update | Yes |
4467697 |
Monthly Rollup | 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
Igor Glucksmann of Avast Software
References
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