CVE-2018-8235 — Microsoft Edge Security Feature Bypass Vulnerability

Executive Summary

A security feature bypass vulnerability exists when Microsoft Edge improperly handles requests of different origins. The vulnerability allows Microsoft Edge to bypass Same-Origin Policy (SOP) restrictions, and to allow requests that should otherwise be ignored. An attacker who successfully exploited the vulnerability could force the browser to send 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 Edge 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 Edge handles different-origin requests.

Overview

4.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Jun 12 2018

Last Updated Jun 12 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

11 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems	`4284860 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems	`4284860 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems	`4284880 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems	`4284880 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems	`4284874 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems	`4284874 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems	`4284819 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems	`4284819 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems	`4284835 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems	`4284835 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2016	`4284880 (Security Update)`	Low	Security Feature Bypass	Yes

Patches

5 patches

Article	Type	Restart
`4284860`	Security Update	Yes
`4284880`	Security Update	Yes
`4284874`	Security Update	Yes
`4284819`	Security Update	Yes
`4284835`	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

Jake Archibald - Google - https://jakearchibald.com

References

MSRC Advisory MITRE NVD