CVE-2018-0949 — Internet Explorer Security Feature Bypass Vulnerability

Executive Summary

A security feature bypass vulnerability exists when Microsoft Internet Explorer improperly handles requests involving UNC resources. An attacker who successfully exploited the vulnerability could force the browser to load data that would otherwise be restricted. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft Internet Explorer and then convince a user to view the website. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how affected Microsoft Internet Explorer handles requests involving UNC resources.

Overview

4.3

CVSS MEDIUM

Low

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Security Feature Bypass

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

Required

SCOPE

Unchanged

CONFIDENTIALITY

Low

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 3.9

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

3 affected products

Product	KB Article	Severity	Impact	Restart Required
Internet Explorer 10 on Windows Server 2012 4338830 (Monthly Rollup) 4339093 (IE Cumulative) 4338816 (Preview Rollup) 4345425 (Standalone) Low Security Feature Bypass 4284855 4230450 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 for 32-bit Systems 4338829 (Security Update) 4345455 (Alternate Cumulative) Important Security Feature Bypass 4284860 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 for x64-based Systems 4338829 (Security Update) 4345455 (Alternate Cumulative) Important Security Feature Bypass 4284860 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems 4338814 (Security Update) 4345418 (Alternate Cumulative) Important Security Feature Bypass 4284880 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems 4338814 (Security Update) 4345418 (Alternate Cumulative) Important Security Feature Bypass 4284880 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems 4338826 (Security Update) 4345419 (Alternate Cumulative) Important Security Feature Bypass 4284874 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems 4338826 (Security Update) 4345419 (Alternate Cumulative) Important Security Feature Bypass 4284874 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems 4338825 (Security Update) 4345420 (Alternate Cumulative) Important Security Feature Bypass 4284819 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems 4338825 (Security Update) 4345420 (Alternate Cumulative) Important Security Feature Bypass 4284819 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems 4338819 (Security Update) 4345421 (Alternate Cumulative) Important Security Feature Bypass 4284835 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems 4338819 (Security Update) 4345421 (Alternate Cumulative) Important Security Feature Bypass 4284835 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4339093 (IE Cumulative) 4338818 (Monthly Rollup) 4338821 (Preview Rollup) 4345459 (Standalone) Important Security Feature Bypass 4230450 4284826 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 4339093 (IE Cumulative) 4338818 (Monthly Rollup) 4338821 (Preview Rollup) 4345459 (Standalone) Important Security Feature Bypass 4230450 4284826 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 8.1 for 32-bit systems 4339093 (IE Cumulative) 4338815 (Monthly Rollup) 4338831 (Preview Rollup) 4345424 (Standalone) Important Security Feature Bypass 4230450 4284815 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows 8.1 for x64-based systems 4339093 (IE Cumulative) 4338815 (Monthly Rollup) 4338831 (Preview Rollup) 4345424 (Standalone) Important Security Feature Bypass 4230450 4284815 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows RT 8.1	`4338815 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4339093 (IE Cumulative) 4338818 (Monthly Rollup) 4338821 (Preview Rollup) 4345459 (Standalone) Low Security Feature Bypass 4230450 4284826 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2012 R2 4339093 (IE Cumulative) 4338815 (Monthly Rollup) 4338831 (Preview Rollup) 4345424 (Standalone) Low Security Feature Bypass 4230450 4284815 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 11 on Windows Server 2016 4338814 (Security Update) 4345418 (Alternate Cumulative) Low Security Feature Bypass 4284880 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes None Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2	`4339093 (IE Cumulative)`	Important	Security Feature Bypass	Yes
Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2	`4339093 (IE Cumulative)`	Important	Security Feature Bypass	Yes

Patches

2 patches

Article	Type	Restart
`4338815`	Monthly Rollup	Yes
`4339093`	IE Cumulative	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

Masato Kinugawa

References

MSRC Advisory MITRE NVD