CVE-2017-0293 in Windows
Summary
by MITRE
Microsoft Windows PDF Library in Windows Server 2008 R2 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows a remote code execution vulnerability when it improperly handles objects in memory, aka "Windows PDF Remote Code Execution Vulnerability".
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Analysis
by VulDB Data Team • 01/07/2021
The vulnerability identified as CVE-2017-0293 represents a critical remote code execution flaw within Microsoft Windows PDF Library components that affects multiple operating system versions including Windows Server 2008 R2 SP1 through Windows Server 2016. This weakness stems from improper memory handling when processing PDF objects, creating a pathway for malicious actors to execute arbitrary code on affected systems. The vulnerability exists in the Windows PDF rendering engine that processes PDF documents, particularly when these documents contain malformed or specially crafted objects that trigger memory corruption conditions. Attackers can exploit this issue by delivering malicious PDF files through various attack vectors such as email attachments, web downloads, or malicious websites, making it particularly dangerous in enterprise environments where users frequently interact with PDF documents.
The technical flaw manifests when the Windows PDF Library fails to properly validate and handle memory objects during PDF parsing operations, leading to memory corruption that can be leveraged for privilege escalation and arbitrary code execution. This vulnerability operates at the kernel level within the PDF rendering subsystem, where insufficient input validation allows attackers to manipulate memory structures and potentially overwrite critical system data. The flaw falls under CWE-125 which describes out-of-bounds read conditions, and more specifically relates to improper handling of memory objects in the context of PDF processing. According to ATT&CK framework, this vulnerability maps to T1203 - Exploitation for Client Execution and T1059 - Command and Scripting Interpreter, as attackers can leverage this weakness to execute malicious code and establish persistent access. The vulnerability's exploitation requires minimal user interaction, often just opening a malicious PDF document, making it particularly dangerous in phishing campaigns and targeted attacks.
The operational impact of CVE-2017-0293 extends beyond simple code execution to encompass complete system compromise and potential lateral movement within networks. Once successfully exploited, attackers can gain elevated privileges and establish persistent backdoors, making this vulnerability particularly attractive for advanced persistent threat actors. Organizations running affected Windows versions face significant risk as the vulnerability affects widely deployed systems including servers and desktop environments, with no user interaction required for exploitation. The vulnerability's presence in multiple Windows versions means that organizations must implement comprehensive patch management strategies across their entire infrastructure, as the attack surface spans from older server environments to newer client operating systems. Security teams must also consider the potential for zero-day exploitation of this vulnerability, as its discovery and public disclosure created opportunities for nation-state actors and cybercriminals to develop and deploy exploit code before widespread patch adoption occurred.
Mitigation strategies for CVE-2017-0293 require immediate patch deployment through Microsoft's security updates, particularly MS17-017 which addresses this specific vulnerability. Organizations should implement network segmentation and access controls to limit PDF file processing capabilities, particularly in high-value network segments. The principle of least privilege should be enforced by restricting user permissions and implementing application whitelisting policies that prevent execution of untrusted PDF files. Security monitoring should focus on detecting suspicious PDF file downloads and opening activities, while endpoint protection solutions should be configured to scan PDF content for known malicious patterns. Regular vulnerability assessments and penetration testing should be conducted to identify unpatched systems, and incident response procedures should include specific protocols for handling potential exploitation attempts. Additionally, organizations should consider implementing email filtering solutions that can detect and block malicious PDF attachments, as well as web proxies that can scan and sanitize PDF content before delivery to end users. The vulnerability's classification as a critical remote code execution flaw necessitates immediate remediation and continuous monitoring to prevent exploitation attempts and maintain organizational security posture.