OnlyPatch
Microsoft XML Core Services

CVE-2018-8494 — MS XML Remote Code Execution Vulnerability

Critical CVSS 7.5 2018-10 archive

Executive Summary

A remote code execution vulnerability exists when the Microsoft XML Core Services MSXML parser processes user input. An attacker who successfully exploited the vulnerability could run malicious code remotely to take control of the user’s system. To exploit the vulnerability, an attacker could host a specially crafted website designed to invoke MSXML through a web browser. However, an attacker would have no way to force a user to visit such a website. Instead, an attacker would typically have to convince a user to either click a link in an email message or instant message that would then take the user to the website. When Internet Explorer parses the XML content, an attacker could run malicious code remotely to take control of the user’s system. The update addresses the vulnerability by correcting how the MSXML parser processes user input.

Overview

7.5
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
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
High
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7

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 for 32-bit Systems 4462922 (Security Update) Critical Remote Code Execution Yes
Windows 10 for x64-based Systems 4462922 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for 32-bit Systems 4462917 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1607 for x64-based Systems 4462917 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1703 for 32-bit Systems 4462937 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1703 for x64-based Systems 4462937 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for 32-bit Systems 4462918 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1709 for x64-based Systems 4462918 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for 32-bit Systems 4462919 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1803 for x64-based Systems 4462919 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for 32-bit Systems 4464330 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 4464330 (Security Update) Critical Remote Code Execution Yes
Windows 7 for 32-bit Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Critical Remote Code Execution 4457144 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 7 for x64-based Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Critical Remote Code Execution 4457144 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for 32-bit systems 4462926 (Monthly Rollup) 4462941 (Security Only) Critical Remote Code Execution 4457129 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4462926 (Monthly Rollup) 4462941 (Security Only) Critical Remote Code Execution 4457129 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1 4462926 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Critical Remote Code Execution 4458010 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4463097 (Monthly Rollup) 4463104 (Security Only) Critical Remote Code Execution 4458010 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Critical Remote Code Execution 4458010 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4463097 (Monthly Rollup) 4463104 (Security Only) Critical Remote Code Execution 4458010 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4463097 (Monthly Rollup) 4463104 (Security Only) Critical Remote Code Execution 4458010 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Critical Remote Code Execution 4457144 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4462923 (Monthly Rollup) 4462915 (Security Only) Critical Remote Code Execution 4457144 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4462923 (Monthly Rollup) 4462915 (Security Only) Critical Remote Code Execution 4457144 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 4462929 (Monthly Rollup) 4462931 (Security Only) Critical Remote Code Execution 4457135 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4462929 (Monthly Rollup) 4462931 (Security Only) Critical Remote Code Execution 4457135 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4462926 (Monthly Rollup) 4462941 (Security Only) Critical Remote Code Execution 4457129 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4462926 (Monthly Rollup) 4462941 (Security Only) Critical Remote Code Execution 4457129 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 4462917 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 4462917 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 4464330 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 4464330 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1709 (Server Core Installation) 4462918 (Security Update) Critical Remote Code Execution Yes
Windows Server, version 1803 (Server Core Installation) 4462919 (Security Update) Critical Remote Code Execution Yes

Patches

7 patches
Article Type Restart
4462922 Security Update Yes
4462917 Security Update Yes
4462937 Security Update Yes
4462918 Security Update Yes
4462919 Security Update Yes
4464330 Security Update Yes
4462926 Monthly Rollup Yes

Known Exploits

Acknowledgments

Guy Inbar (guyio)

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