CVE-2018-8320 — Windows DNS Security Feature Bypass Vulnerability

Executive Summary

A security feature bypass vulnerability exists in DNS Global Blocklist feature. An attacker who successfully exploited this vulnerability could redirect traffic to malicious DNS endpoints. The update addresses the vulnerability by updating DNS Server Role record additions to not bypass the Global Query Blocklist.

Overview

4.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Oct 9 2018

Last Updated Oct 9 2018

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

Low

INTEGRITY

None

AVAILABILITY

None

Temporal Score: 4.3

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

14 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`4462917 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1607 for x64-based Systems	`4462917 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1709 for 32-bit Systems	`4462918 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1709 for x64-based Systems	`4462918 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for 32-bit Systems	`4462919 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1803 for x64-based Systems	`4462919 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for 32-bit Systems	`4464330 (Security Update)`	Important	Security Feature Bypass	Yes
Windows 10 Version 1809 for x64-based Systems	`4464330 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Important Security Feature Bypass 4458010 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4463097 (Monthly Rollup) 4463104 (Security Only) Important Security Feature Bypass 4458010 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Important Security Feature Bypass 4458010 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Important Security Feature Bypass 4458010 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4463097 (Monthly Rollup) 4463104 (Security Only) Important Security Feature Bypass 4458010 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Important Security Feature Bypass 4457144 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Important Security Feature Bypass 4457144 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4462923 (Monthly Rollup) 4462915 (Security Only) Important Security Feature Bypass 4457144 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2012 4462929 (Monthly Rollup) 4462931 (Security Only) Important Security Feature Bypass 4457135 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2012 (Server Core installation) 4462929 (Monthly Rollup) 4462931 (Security Only) Important Security Feature Bypass 4457135 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2012 R2 4462926 (Monthly Rollup) 4462941 (Security Only) Important Security Feature Bypass 4457129 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2012 R2 (Server Core installation) 4462926 (Monthly Rollup) 4462941 (Security Only) Important Security Feature Bypass 4457129 Base: 4.3 Temporal: 4.3 Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Yes None Windows Server 2016	`4462917 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2016 (Server Core installation)	`4462917 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019	`4464330 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server 2019 (Server Core installation)	`4464330 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1709 (Server Core Installation)	`4462918 (Security Update)`	Important	Security Feature Bypass	Yes
Windows Server, version 1803 (Server Core Installation)	`4462919 (Security Update)`	Important	Security Feature Bypass	Yes

Patches

4 patches

Article	Type	Restart
`4462917`	Security Update	Yes
`4462918`	Security Update	Yes
`4462919`	Security Update	Yes
`4464330`	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

Kevin Robertson of NetSPI

References

MSRC Advisory MITRE NVD