CVE-2018-8206 — Windows Firewall Denial of Service Vulnerability

Executive Summary

A denial of service vulnerability exists when Windows improperly handles File Transfer Protocol (FTP) connections. An attacker who successfully exploited the vulnerability could cause a target system to stop responding. To exploit the vulnerability, an unauthenticated attacker could send specially crafted packets to a Windows computer that is processing connections on TCP port 21. The vulnerability would not allow an attacker to execute code or to elevate user rights directly, but it could be used to cause a target system to stop responding. The security update addresses the vulnerability by correcting how Windows handles FTP connections.

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Denial of Service

Released Jul 10 2018

Last Updated Jul 10 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

None

INTEGRITY

None

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

6 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems 4338829 (Security Update) 4345455 (Alternate Cumulative) Important Denial of Service 4284860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 for x64-based Systems 4338829 (Security Update) 4345455 (Alternate Cumulative) Important Denial of Service 4284860 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1607 for 32-bit Systems 4338814 (Security Update) 4345418 (Alternate Cumulative) Important Denial of Service 4284880 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1607 for x64-based Systems 4338814 (Security Update) 4345418 (Alternate Cumulative) Important Denial of Service 4284880 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1703 for 32-bit Systems 4338826 (Security Update) 4345419 (Alternate Cumulative) Important Denial of Service 4284874 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1703 for x64-based Systems 4338826 (Security Update) 4345419 (Alternate Cumulative) Important Denial of Service 4284874 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1709 for 32-bit Systems 4338825 (Security Update) 4345420 (Alternate Cumulative) Important Denial of Service 4284819 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1709 for x64-based Systems 4338825 (Security Update) 4345420 (Alternate Cumulative) Important Denial of Service 4284819 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1803 for 32-bit Systems 4338819 (Security Update) 4345421 (Alternate Cumulative) Important Denial of Service 4284835 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 10 Version 1803 for x64-based Systems 4338819 (Security Update) 4345421 (Alternate Cumulative) Important Denial of Service 4284835 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 7 for 32-bit Systems Service Pack 1 4338818 (Monthly Rollup) 4338823 (Security Only) 4338821 (Preview Rollup) 4345459 (Standalone) Important Denial of Service 4284826 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 7 for x64-based Systems Service Pack 1 4338818 (Monthly Rollup) 4338823 (Security Only) 4338821 (Preview Rollup) 4345459 (Standalone) Important Denial of Service 4284826 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for 32-bit systems 4338815 (Monthly Rollup) 4338824 (Security Only) 4338831 (Preview Rollup) 4345424 (Standalone) Important Denial of Service 4284815 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4338815 (Monthly Rollup) 4338824 (Security Only) 4338831 (Preview Rollup) 4345424 (Standalone) Important Denial of Service 4284815 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1	`4338815 (Monthly Rollup)`	Important	Denial of Service	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2	`4293756 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)	`4293756 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2008 for Itanium-Based Systems Service Pack 2	`4293756 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2008 for x64-based Systems Service Pack 2	`4293756 (Security Update)`	Important	Denial of Service	Yes
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)	`4293756 (Security Update)`	Important	Denial of Service	Yes

Patches

2 patches

Article	Type	Restart
`4338815`	Monthly Rollup	Yes
`4293756`	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

Brandon Falk ( @gamozolabs

References

MSRC Advisory MITRE NVD