CVE-2018-8634 — Microsoft Text-To-Speech Remote Code Execution Vulnerability

Executive Summary

A remote code execution vulnerability exists in Windows where Microsoft text-to-speech fails to properly handle objects in the memory. An attacker who successfully exploited this vulnerability could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. The security update addresses the vulnerability by correcting how the Microsoft text-to-speech handles objects in the memory.

Overview

4.2

CVSS MEDIUM

Critical

MS Severity

Not Exploited

MS Exploit Status

More 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

High

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

Low

INTEGRITY

Low

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.org

Affected Products

21 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`4471323 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 for x64-based Systems	`4471323 (Security Update)`	Critical	Remote Code Execution	Yes
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 1703 for 32-bit Systems	`4471327 (Security Update)`	Critical	Remote Code Execution	Yes
Windows 10 Version 1703 for x64-based Systems	`4471327 (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 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

6 patches

Article	Type	Restart
`4471323`	Security Update	Yes
`4471321`	Security Update	Yes
`4471327`	Security Update	Yes
`4471329`	Security Update	Yes
`4471324`	Security Update	Yes
`4471332`	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

Marcin Towalski ( @mtowalski1

References

MSRC Advisory MITRE NVD