CVE-2016-0058 in Windows
Summary
by MITRE
Buffer overflow in the PDF Library in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, and Windows 10 allows remote attackers to execute arbitrary code via a crafted PDF document that triggers API calls, aka "Microsoft PDF Library Buffer Overflow Vulnerability."
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Analysis
by VulDB Data Team • 07/07/2022
The CVE-2016-0058 vulnerability represents a critical buffer overflow flaw within Microsoft's PDF Library component that affects multiple Windows operating systems including Windows 8.1, Windows Server 2012 Gold and R2, and Windows 10. This vulnerability resides in the core PDF processing functionality that handles document parsing and rendering operations, making it particularly dangerous as it can be triggered through standard PDF document interactions. The flaw specifically manifests when the PDF library processes malformed or crafted PDF files, leading to memory corruption that can be exploited by remote attackers to execute arbitrary code on affected systems. The vulnerability is categorized under CWE-121 as a stack-based buffer overflow, which occurs when insufficient bounds checking allows data to overwrite adjacent memory locations, potentially corrupting program execution flow.
The technical exploitation of this vulnerability leverages the PDF library's handling of specific API calls within the document processing pipeline. When a malicious PDF document is opened or processed, the library fails to properly validate input data lengths against allocated buffer sizes, creating opportunities for attackers to craft payloads that exceed buffer boundaries. This overflow can overwrite critical memory regions including return addresses, function pointers, or other control data structures, enabling attackers to redirect program execution flow to malicious code. The vulnerability is particularly concerning because it operates at a low-level library component that is frequently invoked during routine PDF processing operations, making exploitation possible through various attack vectors including email attachments, web downloads, or document sharing platforms.
The operational impact of CVE-2016-0058 extends beyond simple code execution as it provides attackers with persistent access to affected systems. The vulnerability can be exploited through remote attack vectors, meaning users do not need physical access to target systems to exploit the flaw. This characteristic aligns with ATT&CK technique T1203, which describes the exploitation of software vulnerabilities for remote code execution. The attack surface is broad since PDF documents are commonly encountered in business environments, educational institutions, and personal use scenarios, making the vulnerability particularly dangerous for enterprise environments. Successful exploitation can result in complete system compromise, data theft, persistent backdoor installation, and lateral movement within network environments, as attackers can leverage the executed code to establish further footholds or escalate privileges.
Mitigation strategies for CVE-2016-0058 should focus on immediate patch management and operational security measures. Microsoft released security updates addressing this vulnerability through regular monthly patches, and organizations should prioritize deployment of the relevant security updates to prevent exploitation. Network-based mitigations include implementing PDF content filtering solutions that scan and validate PDF documents before they reach end-user systems, though this approach requires careful consideration of performance impacts. Additional defensive measures include disabling PDF processing in web browsers where possible, implementing application whitelisting policies that restrict PDF library usage, and monitoring for unusual API call patterns that might indicate exploitation attempts. Organizations should also consider segmenting network environments to limit lateral movement capabilities and maintain comprehensive monitoring of system logs for signs of exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security patches and the critical need for layered security approaches that address both software vulnerabilities and operational security practices.