CVE-2016-3201 in Windows
Summary
by MITRE
Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 Gold and 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-2016-3215.
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Analysis
by VulDB Data Team • 08/23/2022
The vulnerability identified as CVE-2016-3201 represents a critical information disclosure flaw within Microsoft Windows operating systems and Microsoft Edge browser that specifically targets PDF rendering functionality. This vulnerability affects Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 Gold and 1511 versions, making it a widespread issue across multiple Microsoft platforms. The flaw stems from improper handling of crafted PDF documents during the rendering process, allowing malicious actors to extract sensitive data from process memory through carefully constructed malicious files.
The technical implementation of this vulnerability occurs within the PDF parsing and rendering components of Microsoft's Windows operating systems and Edge browser. When a user opens a specially crafted PDF document, the vulnerable code fails to properly validate memory access during the rendering process, creating opportunities for information leakage. This type of vulnerability falls under the Common Weakness Enumeration category CWE-200, which specifically addresses "Information Exposure" weaknesses in software systems. The flaw essentially allows attackers to bypass normal memory protection mechanisms that should prevent unauthorized access to process memory spaces.
The operational impact of CVE-2016-3201 is significant as it enables remote attackers to obtain sensitive information from process memory without requiring local system access or elevated privileges. Attackers can craft malicious PDF documents that, when opened by unsuspecting users, will trigger memory disclosure mechanisms that expose confidential data such as encryption keys, passwords, session tokens, or other sensitive information stored in memory. This vulnerability particularly affects enterprise environments where users frequently open PDF documents from external sources, making it a prime target for phishing campaigns and targeted attacks. The vulnerability's remote exploitation capability means that attackers can deliver malicious payloads through email attachments, web downloads, or other remote delivery mechanisms without requiring physical access to the target system.
Mitigation strategies for this vulnerability should include immediate installation of Microsoft security updates and patches released to address the specific flaw in PDF handling components. Organizations should implement strict email filtering and web content filtering measures to prevent users from opening potentially malicious PDF documents from untrusted sources. Network administrators should consider implementing sandboxing mechanisms for PDF document handling and deploy endpoint protection solutions that can detect and block suspicious PDF file behaviors. The vulnerability demonstrates the importance of secure coding practices in handling untrusted input data, particularly in components that process complex file formats like PDFs. Security teams should also consider implementing memory protection techniques such as data execution prevention and address space layout randomization to reduce the effectiveness of potential exploitation attempts. Given its classification as an information disclosure vulnerability, organizations should also review their incident response procedures to ensure they can quickly detect and respond to potential exploitation attempts that may involve memory scraping techniques. The vulnerability highlights the ongoing challenge of securing complex software components that handle rich media formats and emphasizes the need for continuous security assessments of third-party libraries and components used in operating system implementations.