CVE-2017-0023 in Windows
Summary
by MITRE
The PDF library in Microsoft Edge; Windows 8.1; Windows Server 2012 and R2; Windows RT 8.1; and Windows 10, 1511, and 1607 allows remote attackers to execute arbitrary code via a crafted PDF file, aka "Microsoft PDF Remote Code Execution Vulnerability."
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability identified as CVE-2017-0023 represents a critical remote code execution flaw within Microsoft Edge's PDF library implementation across multiple Windows operating systems. This vulnerability affects Windows 8.1, Windows Server 2012 and R2, Windows RT 8.1, and Windows 10 versions 1511 and 1607, creating a widespread attack surface that could potentially compromise numerous endpoints. The flaw resides in how the PDF rendering engine processes maliciously crafted PDF files, allowing attackers to execute arbitrary code with the privileges of the current user. This vulnerability is particularly concerning as it leverages the PDF handling capabilities that are commonly used in web browsers and document viewers, making it an attractive target for attackers seeking to exploit user interactions with potentially malicious documents.
The technical root cause of this vulnerability stems from insufficient input validation and memory corruption issues within the PDF parsing and rendering components of Microsoft Edge. When a user opens a specially crafted PDF file, the vulnerable code fails to properly validate the structure and content of the PDF document, leading to memory corruption that can be exploited to gain control over the application's execution flow. This type of vulnerability falls under CWE-121, heap-based buffer overflow, where the PDF parser attempts to write data beyond the bounds of allocated memory buffers. The flaw specifically manifests when the PDF library processes malformed or maliciously constructed PDF objects, particularly those involving embedded JavaScript or complex graphical elements that trigger memory allocation errors during parsing.
The operational impact of CVE-2017-0023 extends beyond simple remote code execution, as it can be leveraged to establish persistent access to compromised systems. Attackers can craft PDF files that, when opened in Microsoft Edge, automatically execute malicious payloads without requiring user interaction beyond the simple act of opening the document. This vulnerability aligns with ATT&CK technique T1203, Exploitation for Client Execution, where adversaries exploit software vulnerabilities to execute malicious code on target systems. The attack vector typically involves social engineering campaigns where users are tricked into opening malicious PDF attachments through email phishing, compromised websites, or malicious download sources. Once exploited, the vulnerability allows attackers to perform actions such as installing malware, stealing credentials, accessing sensitive data, or establishing backdoors for continued access to the compromised system.
Mitigation strategies for CVE-2017-0023 should focus on both immediate defensive measures and long-term remediation approaches. Microsoft addressed this vulnerability through security updates released in January 2017, and organizations should ensure all affected systems receive the appropriate patches promptly. Additional defensive measures include implementing browser security controls such as disabling PDF viewing within web browsers, using sandboxing techniques, and employing content filtering solutions that can detect and block malicious PDF files. Network-based protections such as intrusion detection systems and web application firewalls can help identify and prevent exploitation attempts. Organizations should also consider implementing user education programs to reduce the likelihood of successful social engineering attacks that leverage this vulnerability, as well as maintaining comprehensive incident response procedures to quickly detect and respond to potential exploitation attempts. The vulnerability serves as a reminder of the importance of keeping software up to date and maintaining layered security approaches to protect against sophisticated attack vectors that target commonly used applications and libraries.