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Microsoft Edge (HTML-based)

CVE-2018-8463 — Microsoft Edge Elevation of Privilege Vulnerability

Important CVSS 4.3 2018-09 archive

Executive Summary

An elevation of privilege vulnerability exists in Microsoft Edge that could allow an attacker to escape from the AppContainer sandbox in the browser. An attacker who successfully exploited this vulnerability could gain elevated privileges and break out of the Edge AppContainer sandbox. The vulnerability by itself does not allow arbitrary code to run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (for example a remote code execution vulnerability and another elevation of privilege vulnerability) to take advantage of the elevated privileges when running. The security update addresses the vulnerability by modifying how Microsoft Edge handles sandboxing.

Overview

4.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Sep 11 2018
Last Updated Sep 11 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
None
INTEGRITY
Low
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

2 affected products
Product KB Article Severity Impact Restart Required
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems 4457128 (Security Update) Important Elevation of Privilege Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems 4457128 (Security Update) Important Elevation of Privilege Yes

Patches

1 patch
Article Type Restart
4457128 Security Update Yes

Known Exploits

Acknowledgments

Lokihardt of Google Project Zero

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