OnlyPatch
Microsoft Windows DNS

CVE-2018-8626 — Windows DNS Server Heap Overflow Vulnerability

Critical CVSS 9.8 2018-12 archive

Executive Summary

A remote code execution vulnerability exists in Windows Domain Name System (DNS) servers when they fail to properly handle requests. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the Local System Account. Windows servers that are configured as DNS servers are at risk from this vulnerability. To exploit the vulnerability, an unauthenticated attacker could send malicious requests to a Windows DNS server. The update addresses the vulnerability by modifying how Windows DNS servers handle requests.

Overview

9.8
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Dec 11 2018
Last Updated Dec 11 2018
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known

CVSS Vector

ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.8

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

17 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1607 for 32-bit Systems 4471321 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 4471321 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for 32-bit Systems 4471329 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for ARM64-based Systems 4471329 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for x64-based Systems 4471329 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for 32-bit Systems 4471324 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for ARM64-based Systems 4471324 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for x64-based Systems 4471324 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 4471332 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for ARM64-based Systems 4471332 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 4471332 (Security Update) Critical Remote Code Execution Yes
Windows Server 2012 R2 4471320 (Monthly Rollup) 4471322 (Security Only) Critical Remote Code Execution 4467697 Base: 9.8 Temporal: 8.8 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4471320 (Monthly Rollup) 4471322 (Security Only) Critical Remote Code Execution 4467697 Base: 9.8 Temporal: 8.8 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 4471321 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 4471321 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 4471332 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 4471332 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1709 (Server Core Installation) 4471329 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1803 (Server Core Installation) 4471324 (Security Update) Critical Remote Code Execution Yes

Patches

4 patches
Article Type Restart
4471321 Security Update Yes
4471329 Security Update Yes
4471324 Security Update Yes
4471332 Security Update Yes

Known Exploits

Acknowledgments

Mitch Adair, Microsoft Windows Enterprise Security Team

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