CVE-2018-8235 in Edge
Summary
by MITRE
A security feature bypass vulnerability exists when Microsoft Edge improperly handles requests of different origins, aka "Microsoft Edge Security Feature Bypass Vulnerability." This affects Microsoft Edge.
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Analysis
by VulDB Data Team • 03/27/2023
The CVE-2018-8235 vulnerability represents a critical security feature bypass in Microsoft Edge browser that stems from improper handling of cross-origin requests. This flaw allows attackers to circumvent intended security protections that should prevent malicious code from accessing resources across different domains or origins. The vulnerability specifically impacts the browser's implementation of same-origin policy enforcement mechanisms which are fundamental to web security architecture. When Microsoft Edge processes requests from different origins, it fails to properly validate or enforce security boundaries that should separate trusted and untrusted content, creating an avenue for attackers to bypass essential protection controls.
The technical nature of this vulnerability resides in the browser's origin validation logic where it incorrectly processes requests that should be restricted based on domain, protocol, or port differences. This misimplementation allows malicious actors to craft requests that appear to originate from trusted sources while actually executing code with elevated privileges or accessing restricted resources. The flaw operates at the application layer of the OSI model, specifically within the browser's security enforcement mechanisms that should prevent cross-site scripting attacks and other origin-based security violations. According to CWE classification, this vulnerability maps to CWE-284: Improper Access Control, which addresses insufficient access control mechanisms that allow unauthorized access to resources.
The operational impact of CVE-2018-8235 extends beyond simple privilege escalation to encompass broader security compromise scenarios. Attackers can leverage this vulnerability to perform cross-site request forgery attacks, access sensitive user data, or execute malicious code within the browser context. The vulnerability particularly affects users who browse the internet with Microsoft Edge, making it a significant concern for organizations relying on this browser for business operations. Security researchers have noted that the flaw can be exploited through various attack vectors including malicious websites, phishing campaigns, or compromised third-party web applications that users interact with regularly.
Organizations should implement immediate mitigations including applying Microsoft's security patches and updates as soon as they become available through official channels. Browser configuration settings can be adjusted to enforce stricter cross-origin policies and disable potentially dangerous features that may contribute to the vulnerability exploitation. Network administrators should consider implementing web application firewalls and content filtering solutions that can detect and block suspicious cross-origin requests. The ATT&CK framework categorizes this vulnerability under T1059.001: Command and Scripting Interpreter - PowerShell, where attackers might leverage the bypass to execute malicious scripts or commands within the compromised browser environment. Regular security assessments and user awareness training should be conducted to identify potential exploitation attempts and maintain overall security posture against similar vulnerabilities that may exist in other browser components or web applications.