CVE-2016-3298 in Windows
Summary
by MITRE
Microsoft Internet Explorer 9 through 11 and the Internet Messaging API in Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allow remote attackers to determine the existence of arbitrary files via a crafted web site, aka "Internet Explorer Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 09/09/2024
This vulnerability represents a critical information disclosure flaw in Microsoft Internet Explorer versions 9 through 11 and the Internet Messaging API across multiple Windows operating systems including Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1. The vulnerability stems from improper handling of file existence checks within the browser's rendering engine and messaging components, allowing remote attackers to infer whether specific files exist on a target system through carefully crafted web content. This type of vulnerability falls under the CWE-200 category for "Information Exposure" and aligns with ATT&CK technique T1083 for "File and Directory Discovery" as it enables adversaries to gather reconnaissance information about system files and directories without direct access to the underlying operating system.
The technical implementation of this flaw occurs when Internet Explorer processes web content that contains malicious scripts or embedded objects designed to test file existence through browser APIs or messaging interfaces. Attackers can construct web pages that attempt to access specific file paths and observe the browser's behavior or error responses to determine if target files are present on the system. The vulnerability exploits the difference in error handling between existing and non-existing files, creating a side-channel information leak that reveals system file structure to remote attackers. This information disclosure capability is particularly dangerous as it enables attackers to map out potentially sensitive system components, identify installed software, and gather intelligence for subsequent exploitation attempts.
The operational impact of CVE-2016-3298 extends beyond simple reconnaissance as it provides attackers with foundational knowledge required for more sophisticated attacks. Once an attacker has determined the existence of specific files, they can use this information to craft targeted attacks against known system components or applications. The vulnerability affects a broad range of Microsoft products and operating systems, making it a valuable target for widespread exploitation campaigns. Attackers can leverage this information to identify system configurations, detect installed security tools, or locate files that may contain sensitive data or contain additional vulnerabilities. The remote nature of this attack vector means that adversaries can exploit the vulnerability from anywhere on the internet without requiring physical access to the target system.
Organizations affected by this vulnerability should implement immediate mitigations including applying Microsoft security patches, configuring browser security settings to restrict file system access, and deploying network monitoring solutions to detect suspicious web traffic patterns. The recommended approach involves disabling unnecessary browser features that could expose system information, implementing strict content security policies, and maintaining up-to-date security software to prevent exploitation. Additionally, network administrators should consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts. From a compliance perspective, this vulnerability affects organizations that must maintain strict data protection standards as it represents a potential breach of information security controls that could lead to unauthorized data discovery and subsequent compromise of sensitive systems. The vulnerability demonstrates the importance of proper input validation and error handling in web applications and browser components, as inadequate protection of system resources can lead to significant information disclosure risks that threaten overall system security posture.