CVE-2016-7204 in Edge
Summary
by MITRE
Microsoft Edge allows remote attackers to access arbitrary "My Documents" files via a crafted web site, aka "Microsoft Edge Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 09/29/2022
The vulnerability identified as CVE-2016-7204 represents a critical information disclosure flaw in Microsoft Edge web browser that enables remote attackers to access files stored in the "My Documents" directory through maliciously crafted websites. This vulnerability stems from insufficient input validation and access control mechanisms within the browser's file system interaction protocols, creating an attack vector that bypasses normal security boundaries. The flaw specifically affects Microsoft Edge versions prior to the security updates released in October 2016, leaving users exposed to unauthorized file access when visiting compromised websites.
The technical implementation of this vulnerability exploits the browser's handling of file system paths and directory traversal mechanisms within its security model. When a user visits a malicious website, the crafted web content can manipulate Edge's file access routines to enumerate and retrieve files from the local "My Documents" folder without proper authentication or authorization. This occurs due to inadequate sanitization of file path parameters and insufficient sandboxing controls that should normally isolate web content from local file system resources. The vulnerability is categorized under CWE-22, which addresses path traversal flaws, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter execution, as attackers can leverage this access to potentially escalate privileges or extract sensitive data.
The operational impact of CVE-2016-7204 extends beyond simple information disclosure, as it provides attackers with access to potentially sensitive personal documents, financial records, and other confidential files stored in users' document directories. This access can lead to identity theft, financial fraud, and corporate espionage when attackers target business users who store sensitive documents in these locations. The vulnerability is particularly dangerous because it requires no special privileges or user interaction beyond visiting a malicious website, making it an attractive target for automated attacks and social engineering campaigns. Organizations using Microsoft Edge in enterprise environments face significant risk exposure, as compromised endpoints can serve as entry points for broader network infiltration.
Mitigation strategies for this vulnerability primarily involve immediate application of Microsoft's security patches released in October 2016, which addressed the underlying file system access control issues. System administrators should implement comprehensive patch management protocols to ensure all Edge installations receive the necessary updates promptly. Additional protective measures include enabling enhanced security features within Edge, such as the built-in smartScreen filter and restricted browsing modes that limit file system access. Network administrators should consider implementing web filtering solutions to block access to known malicious domains and deploy endpoint detection systems that monitor for unusual file access patterns. Users should be educated about the risks of visiting untrusted websites and the importance of maintaining current software versions to protect against such vulnerabilities. Organizations should also conduct regular security assessments to identify any remaining exposure risks and implement layered security approaches that reduce the attack surface for similar information disclosure vulnerabilities.