CVE-2017-8460 in Windows
Summary
by MITRE
Windows PDF in Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows information disclosure when a user opens a specially crafted PDF file, aka "Windows PDF Information Disclosure Vulnerability".
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Analysis
by VulDB Data Team • 08/20/2024
The Windows PDF Information Disclosure Vulnerability CVE-2017-8460 represents a critical security flaw in Microsoft's PDF handling components across multiple Windows operating systems including Windows 8.1, Windows Server 2012, Windows RT 8.1, various Windows 10 versions, and Windows Server 2016. This vulnerability specifically affects the way Windows processes PDF files through its built-in PDF viewer functionality, creating an information disclosure channel that could potentially expose sensitive data to unauthorized parties. The flaw resides within the PDF rendering engine that handles document parsing and display operations, making it particularly dangerous as it can be triggered simply by opening a maliciously crafted PDF file. This vulnerability operates at the application level within the Windows operating system framework, leveraging the inherent trust users place in PDF documents to execute malicious code or extract confidential information. The issue falls under the CWE-200 category of "Information Exposure" and can be classified as a privilege escalation vulnerability when considering its potential to reveal system information or user data. According to the ATT&CK framework, this vulnerability maps to T1059.007 for PowerShell and T1068 for Exploitation for Privilege Escalation, as attackers could potentially leverage the information disclosure to gather system details for further exploitation. The vulnerability manifests when a user opens a specially crafted PDF file that contains malicious code designed to exploit memory handling issues within the PDF rendering component.
The technical implementation of this vulnerability involves memory corruption issues within the Windows PDF processing subsystem that occurs during the parsing of malformed PDF structures. When a user opens a malicious PDF file, the PDF viewer component attempts to parse and render the document, but encounters specially constructed data that triggers memory access violations or information leakage. The flaw is particularly concerning because it operates without requiring user interaction beyond the simple act of opening the file, making it highly exploitable in social engineering attacks or automated malware distribution campaigns. The vulnerability allows for the disclosure of memory contents that may include sensitive information such as system pointers, user credentials, or other confidential data stored in memory during PDF processing operations. This information disclosure could potentially enable attackers to perform further attacks by gathering system architecture details, memory layout information, or other sensitive data that would aid in bypassing security controls or developing more sophisticated exploitation techniques. The memory corruption aspect of this vulnerability aligns with common exploitation patterns seen in buffer overflow attacks, where malformed input data causes the application to behave unpredictably and potentially reveal confidential information through memory dumps or access violations.
The operational impact of CVE-2017-8460 extends beyond simple information disclosure, as it creates a potential gateway for more severe security incidents within affected Windows environments. Organizations running vulnerable systems face significant risks including data breaches, credential theft, and potential system compromise when users inadvertently open malicious PDF files. The widespread presence of PDF viewing capabilities across all affected Windows versions means that this vulnerability impacts a broad range of enterprise and consumer systems, making it a high-priority concern for security teams. The vulnerability's exploitation potential increases when combined with other attack vectors, as the disclosed information could be used to craft more targeted attacks against specific systems or users. Security researchers have noted that this vulnerability can be particularly dangerous in enterprise environments where PDF documents are commonly shared and used for business communications, potentially allowing attackers to gain intelligence about network configurations or user activities. The vulnerability's impact is amplified by the fact that many users do not regularly update their systems, leaving them exposed to this information disclosure threat for extended periods.
Mitigation strategies for CVE-2017-8460 should focus on immediate patch deployment and operational security measures to protect against exploitation attempts. Microsoft released security updates addressing this vulnerability through regular monthly patches, and organizations should prioritize applying these updates to all affected systems. Network administrators should implement additional controls such as PDF file scanning, content filtering, and user education programs to reduce the risk of encountering malicious PDF files. The implementation of application whitelisting policies can help prevent execution of unauthorized PDF processing components, while network monitoring can detect suspicious PDF-related traffic patterns that might indicate exploitation attempts. Security teams should also consider deploying intrusion detection systems capable of identifying attempts to exploit this vulnerability through crafted PDF files, as well as implementing security awareness training to educate users about the risks of opening untrusted PDF documents. Organizations should conduct regular vulnerability assessments to ensure all systems are properly patched and monitor for indicators of compromise that might suggest successful exploitation attempts. The vulnerability's classification under CWE-200 and its mapping to ATT&CK techniques T1059.007 and T1068 emphasize the need for comprehensive security measures that address both the immediate vulnerability and broader exploitation patterns that could arise from information disclosure attacks.