CVE-2014-1777 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 10 and 11 allows remote attackers to read local files on the client via a crafted web site, aka "Internet Explorer Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 09/01/2025
This vulnerability affects Microsoft Internet Explorer versions 10 and 11, representing a critical information disclosure flaw that enables remote attackers to access local files on compromised systems. The vulnerability stems from improper handling of certain web content that triggers unexpected behavior in the browser's file access mechanisms. Attackers can craft malicious websites that exploit this weakness to read files from the local filesystem without proper authorization, potentially exposing sensitive data including user documents, configuration files, and system information. The flaw operates through a combination of browser rendering engine vulnerabilities and insufficient input validation that allows crafted web content to bypass normal security boundaries. This type of vulnerability falls under the CWE-200 category for information exposure and aligns with ATT&CK technique T1059.1001 for command and scripting interpreter. The impact extends beyond simple data theft as it can provide attackers with footholds for further exploitation, potentially leading to complete system compromise. The vulnerability is particularly dangerous because it requires no user interaction beyond visiting a malicious website, making it a prime candidate for drive-by download attacks and social engineering campaigns. The flaw demonstrates a failure in the browser's security model where local file system access controls are improperly enforced during web page rendering. This represents a significant breach in the principle of least privilege, where web content should not be able to access local resources without explicit user consent. The vulnerability exists due to inadequate sandboxing mechanisms and insufficient validation of file paths when processing web content, allowing attackers to manipulate browser behavior to access restricted files.
The technical exploitation of this vulnerability involves crafting web pages that trigger specific browser code paths leading to unauthorized file access. Attackers typically leverage browser-specific behaviors and memory handling quirks to bypass normal security restrictions. The flaw may be triggered through various vectors including malformed HTML content, JavaScript code execution, or improper handling of file URI schemes. When a user visits a malicious website, the browser's rendering engine processes the crafted content and inadvertently accesses local files through mechanisms designed for legitimate web functionality. This type of vulnerability represents a classic example of improper input validation where the browser fails to properly sanitize or validate file access requests originating from web content. The information disclosure can include sensitive files such as user credentials, personal documents, system configuration files, and application data that may contain additional exploitable information. Security researchers have noted that this vulnerability can be combined with other exploits to create more sophisticated attack chains, where initial information disclosure provides data needed for subsequent exploitation phases.
The operational impact of CVE-2014-1777 extends far beyond immediate data theft, creating potential for significant system compromise and data breaches. Organizations running affected versions of Internet Explorer face increased risk of insider threats, intellectual property theft, and compliance violations due to unauthorized file access. The vulnerability's remote nature means attackers can exploit it from anywhere on the internet without requiring physical access to target systems. This makes it particularly attractive for cybercriminals and nation-state actors seeking to conduct large-scale attacks against multiple targets simultaneously. The vulnerability also impacts enterprise environments where users may have elevated privileges, potentially allowing attackers to access corporate data repositories, network configuration files, and sensitive business information. Security professionals must consider this vulnerability as part of broader threat modeling exercises, particularly in environments where Internet Explorer remains the primary browser. The flaw can be particularly damaging in industries such as finance, healthcare, and government where data protection regulations require strict controls over information access and disclosure. Organizations may need to implement additional network monitoring and endpoint protection measures to detect exploitation attempts, as the vulnerability can be difficult to detect through traditional security scanning methods.
Mitigation strategies for this vulnerability require both immediate patching and operational security measures. Microsoft released security updates that addressed the underlying browser rendering engine issues and improved file access validation. Organizations should prioritize deployment of these patches across all affected systems, particularly those running Internet Explorer 10 and 11. Additional defensive measures include implementing web application firewalls, restricting browser access to local resources, and configuring network segmentation to limit potential exploitation paths. Security teams should monitor for exploitation attempts through network traffic analysis and endpoint detection systems that can identify malicious web content patterns. Browser hardening techniques such as disabling unnecessary features, implementing strict content security policies, and using enhanced security configurations can reduce the attack surface. Organizations should also consider implementing user education programs to raise awareness about visiting untrusted websites and the risks associated with browser-based attacks. The vulnerability highlights the importance of maintaining up-to-date software and implementing layered security approaches that provide multiple defense mechanisms against similar exploitation techniques. Regular security assessments and penetration testing should include evaluation of browser-based attack vectors to ensure comprehensive protection against information disclosure vulnerabilities.