CVE-2020-1140 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when DirectX improperly handles objects in memory, aka 'DirectX Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/17/2020
The CVE-2020-1140 vulnerability represents a critical elevation of privilege flaw within the DirectX graphics subsystem of Microsoft Windows operating systems. This vulnerability stems from improper handling of memory objects within the DirectX framework, which is a collection of application programming interfaces for handling tasks related to multimedia, particularly game programming and video, on Microsoft platforms. The issue affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise and consumer environments alike. The vulnerability falls under the Common Weakness Enumeration category CWE-121, which deals with stack-based buffer overflow conditions, and more specifically relates to improper handling of memory objects during graphics processing operations.
The technical exploitation of this vulnerability occurs when a malicious actor crafts specific graphics commands or memory allocations that cause DirectX to improperly manage memory objects, leading to a situation where unprivileged code can potentially escalate its privileges to SYSTEM level access. This occurs because the DirectX subsystem does not properly validate or sanitize memory object references during graphics processing operations, allowing attackers to manipulate memory layout or access unauthorized memory regions. The flaw is particularly dangerous because DirectX is a core component of Windows graphics processing, and many applications rely on DirectX for rendering graphics, making the attack surface broad and accessible through various application vectors. Attackers can leverage this vulnerability by executing malicious graphics operations that trigger the improper memory handling, potentially allowing them to execute arbitrary code with elevated privileges.
The operational impact of CVE-2020-1140 is severe and multifaceted, as it provides attackers with a pathway to gain SYSTEM-level privileges on affected systems. This elevation of privilege allows malicious actors to bypass standard security controls, modify system files, install malware, and potentially establish persistent access to compromised systems. The vulnerability can be exploited through various attack vectors including malicious software installations, web-based attacks, or even physical access scenarios where attackers can directly interact with graphics processing components. Organizations running affected Windows versions face significant risk, as the vulnerability can be leveraged to compromise entire networks through lateral movement once initial access is achieved. The impact extends beyond individual system compromise to include potential data breaches, system availability disruptions, and regulatory compliance violations that can result in substantial financial and reputational damage.
Mitigation strategies for CVE-2020-1140 should include immediate deployment of Microsoft security updates and patches that address the memory handling flaws within DirectX components. System administrators should prioritize patch management processes to ensure all affected Windows systems receive the necessary updates promptly. Additional protective measures include implementing strict application whitelisting policies to limit execution of untrusted graphics applications, monitoring for suspicious graphics processing activities, and maintaining up-to-date endpoint protection solutions. The vulnerability aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and T1547.001 which covers 'Registry Run Keys / Startup Folder' as attackers may attempt to establish persistence after privilege escalation. Organizations should also consider network segmentation and privilege separation to limit the potential impact of successful exploitation, while maintaining comprehensive logging and monitoring of graphics processing activities to detect anomalous behavior that may indicate exploitation attempts.