CVE-2016-3215 in Windows
Summary
by MITRE
Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 1511, and Microsoft Edge allow remote attackers to obtain sensitive information from process memory via a crafted PDF document, aka "Windows PDF Information Disclosure Vulnerability," a different vulnerability than CVE-2016-3201.
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Analysis
by VulDB Data Team • 08/23/2022
The vulnerability identified as CVE-2016-3215 represents a critical information disclosure flaw within Microsoft Windows operating systems and Edge browser that specifically targets the processing of PDF documents. This vulnerability affects Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 version 1511, and Microsoft Edge browser, creating a significant security risk for organizations relying on these platforms. The flaw stems from improper memory handling during PDF document parsing, allowing remote attackers to extract sensitive information from process memory through maliciously crafted PDF files. This vulnerability operates under the broader category of information disclosure vulnerabilities, which are classified under CWE-200 in the Common Weakness Enumeration system, representing one of the most prevalent categories of security flaws in software systems. The attack vector requires no local privileges or user interaction beyond opening the malicious PDF document, making it particularly dangerous as it can be exploited through web-based attacks or email attachments.
The technical implementation of this vulnerability occurs when Microsoft Edge browser or Windows PDF viewer processes malformed PDF documents that contain specially crafted data structures designed to trigger memory corruption behaviors. During the parsing process, the system fails to properly validate memory boundaries and handles sensitive data structures in a way that allows attackers to read beyond allocated memory regions. This memory leakage can expose various types of sensitive information including cryptographic keys, authentication tokens, personal data, and other confidential system information that should remain protected within secure memory segments. The vulnerability is particularly concerning because it leverages the PDF processing capabilities that are commonly enabled by default in these operating systems, meaning that users can be compromised simply by encountering a malicious PDF file in normal browsing or document handling activities.
The operational impact of CVE-2016-3215 extends beyond individual user compromise to potentially affect entire organizational security postures, especially in enterprise environments where Windows systems are widely deployed. Attackers can utilize this vulnerability to conduct reconnaissance activities, gather intelligence about system configurations, extract user credentials, or obtain other sensitive data that could be used for further attacks. The vulnerability's classification under the ATT&CK framework places it within the information gathering and credential access domains, where adversaries can leverage such information to escalate privileges or conduct more sophisticated attacks. Organizations running affected versions of Windows and Edge are particularly vulnerable as the flaw exists in core system components that are essential for daily operations. The vulnerability also demonstrates the complexity of modern software security, where seemingly benign functionality like PDF viewing can become a gateway for significant information disclosure attacks, highlighting the importance of comprehensive security testing and memory safety validation.
Mitigation strategies for CVE-2016-3215 primarily involve applying Microsoft's security patches and updates as soon as they become available, which address the underlying memory handling issues in PDF processing components. Organizations should implement network-based security controls such as PDF file filtering and content inspection systems that can identify and block potentially malicious PDF documents before they reach end-user systems. Additionally, security awareness training should be enhanced to educate users about the risks of opening PDF files from untrusted sources, though this approach is less effective given that the vulnerability can be exploited through automated means. System administrators should consider implementing application whitelisting policies that restrict PDF processing to known good applications and disable unnecessary PDF viewing capabilities in web browsers. The vulnerability also underscores the importance of maintaining updated security baselines and following Microsoft's recommended security configurations, as this flaw represents a failure in the fundamental security architecture of the affected systems. Regular security assessments and penetration testing should include evaluation of document processing components to identify similar memory safety issues that could be exploited in similar attack scenarios.