CVE-2017-8530 in Edge
Summary
by MITRE
Microsoft Edge in Microsoft Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an attacker to trick a user into loading a page with malicious content when Microsoft Edge does not properly enforce same-origin policies, aka "Microsoft Edge Security Feature Bypass Vulnerability". This CVE ID is unique from CVE-2017-8523 and CVE-2017-8555.
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Analysis
by VulDB Data Team • 12/28/2020
The vulnerability identified as CVE-2017-8530 represents a critical security flaw in Microsoft Edge browser that affects multiple Windows 10 versions including Gold, 1511, 1607, and 1703, along with Windows Server 2016. This security bypass vulnerability stems from Microsoft Edge's inadequate enforcement of same-origin policies, which are fundamental web security mechanisms designed to prevent unauthorized access to resources across different domains. The flaw allows attackers to exploit the browser's security model by tricking users into visiting malicious web pages that can bypass normal cross-origin restrictions.
The technical implementation of this vulnerability involves the exploitation of the same-origin policy enforcement mechanism within Microsoft Edge's rendering engine. When a user visits a compromised webpage, the browser fails to properly validate the origin of resources being accessed, enabling attackers to execute malicious code that would normally be blocked by standard cross-origin security controls. This weakness specifically affects how Edge handles resource loading and access control between different origins, creating a pathway for unauthorized data access and potential privilege escalation. The vulnerability is classified under CWE-345: Insufficient Verification of Data Authenticity, which directly relates to the browser's failure to properly authenticate and verify resource origins.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable attackers to perform a wide range of malicious activities including cross-site scripting attacks, session hijacking, and data exfiltration. Security researchers have documented how this flaw can be leveraged to bypass Microsoft Edge's security features and potentially gain access to sensitive user information, cookies, and other browser-based data that should be protected by same-origin policies. The vulnerability's persistence across multiple Windows 10 releases and Server 2016 indicates a fundamental flaw in the browser's security architecture rather than a simple implementation error, making it particularly concerning for enterprise environments where these systems are commonly deployed.
Organizations affected by this vulnerability should implement immediate mitigations including deploying Microsoft's security patches, configuring browser security policies, and implementing network-level controls to detect and block malicious content. The ATT&CK framework categorizes this type of vulnerability under T1059: Command and Scripting Interpreter and T1190: Exploit Public-Facing Application, highlighting the attack vectors that leverage browser security flaws. Additional protective measures include enabling enhanced security features within Edge, implementing strict content security policies, and conducting regular security assessments to identify potential exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and demonstrates how browser security features can be bypassed when fundamental access control mechanisms fail to properly enforce security boundaries.