CVE-2018-8493 — Windows TCP/IP Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists when the Windows TCP/IP stack improperly handles fragmented IP packets. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system. To exploit this vulnerability, an attacker would have to send specially crafted fragmented IP packets to a remote Windows computer. The vulnerability would not allow an attacker to execute code or to elevate user rights directly, but it could be used to obtain information that could be used to try to further compromise the affected system. The update addresses the vulnerability by correcting how the Windows TCP/IP stack handles fragmented IP packets.

Overview

5.9

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

N/A

MS Exploit Likelihood

Category Information Disclosure

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

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.3

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

15 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`4462922 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 for x64-based Systems	`4462922 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for 32-bit Systems	`4462917 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`4462917 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for 32-bit Systems	`4462937 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for x64-based Systems	`4462937 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for 32-bit Systems	`4462918 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for x64-based Systems	`4462918 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for 32-bit Systems	`4462919 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for x64-based Systems	`4462919 (Security Update)`	Important	Information Disclosure	Yes
Windows 8.1 for 32-bit systems 4462926 (Monthly Rollup) 4462941 (Security Only) Important Information Disclosure 4457129 Base: N/A Temporal: N/A Vector: N/A Yes None Windows 8.1 for x64-based systems 4462926 (Monthly Rollup) 4462941 (Security Only) Important Information Disclosure 4457129 Base: 5.9 Temporal: 5.3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes None Windows RT 8.1	`4462926 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2 4462926 (Monthly Rollup) 4462941 (Security Only) Important Information Disclosure 4457129 Base: 5.9 Temporal: 5.3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4462926 (Monthly Rollup) 4462941 (Security Only) Important Information Disclosure 4457129 Base: 5.9 Temporal: 5.3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes None Windows Server 2016	`4462917 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`4462917 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1709 (Server Core Installation)	`4462918 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1803 (Server Core Installation)	`4462919 (Security Update)`	Important	Information Disclosure	Yes

Patches

6 patches

Article	Type	Restart
`4462922`	Security Update	Yes
`4462917`	Security Update	Yes
`4462937`	Security Update	Yes
`4462918`	Security Update	Yes
`4462919`	Security Update	Yes
`4462926`	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

Ran Menscher

References

MSRC Advisory MITRE NVD