CVE-2017-0002 in Edge
Summary
by MITRE
Microsoft Edge allows remote attackers to bypass the Same Origin Policy via vectors involving the about:blank URL and data: URLs, aka "Microsoft Edge Elevation of Privilege Vulnerability."
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/20/2025
The vulnerability identified as CVE-2017-0002 represents a critical security flaw in Microsoft Edge browser that enables remote attackers to circumvent the fundamental Same Origin Policy mechanism. This weakness specifically manifests when Edge handles navigation to about:blank URLs combined with data: URLs, creating an exploitation vector that allows adversaries to gain elevated privileges within the browser environment. The Same Origin Policy serves as a cornerstone of web security by preventing scripts from one origin from accessing resources of another origin, making this bypass particularly dangerous as it undermines core web security boundaries.
The technical implementation of this vulnerability stems from how Microsoft Edge processes certain URL combinations during navigation operations. When a malicious actor crafts a page that navigates to about:blank and subsequently loads content via data: URLs, the browser fails to properly enforce cross-origin restrictions. This flaw falls under CWE-284, which addresses improper access control mechanisms, specifically targeting the browser's privilege escalation capabilities. The vulnerability essentially allows attackers to execute code with higher privileges than initially permitted by the browser's security model, enabling them to access sensitive resources and data that should normally be restricted.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with the capability to perform sophisticated attacks against users of Microsoft Edge. An attacker could leverage this vulnerability to steal session cookies, access local files, or execute arbitrary code within the browser context. The attack surface is particularly concerning because it can be triggered through various means including malicious websites, phishing campaigns, or compromised web content. This vulnerability affects Microsoft Edge versions prior to the patch release that addressed the specific navigation handling behavior involving about:blank and data: URL combinations, potentially exposing millions of users to remote code execution risks.
Mitigation strategies for CVE-2017-0002 primarily involve applying the official Microsoft security updates that address the specific URL handling behavior in Edge browser. Organizations should implement comprehensive patch management processes to ensure all Edge installations receive the necessary security updates. Browser vendors and security teams should consider implementing additional protections such as enhanced content security policies and stricter URL validation mechanisms. The vulnerability demonstrates the importance of proper input validation and secure navigation handling in web browsers, aligning with ATT&CK technique T1059 which covers command and scripting interpreters. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of keeping browser software up to date. Security monitoring should include detection of suspicious URL patterns involving about:blank and data: URLs, as these combinations may indicate exploitation attempts. The incident highlights the critical need for continuous security assessment of browser components and the implementation of defense-in-depth strategies to protect against privilege escalation vulnerabilities.