CVE-2020-0723 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0691, CVE-2020-0719, CVE-2020-0720, CVE-2020-0721, CVE-2020-0722, CVE-2020-0724, CVE-2020-0725, CVE-2020-0726, CVE-2020-0731.
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Analysis
by VulDB Data Team • 03/30/2024
The vulnerability identified as CVE-2020-0723 represents a critical elevation of privilege flaw within the Windows operating system, specifically within the Win32k.sys kernel-mode driver component. This component serves as the foundation for Windows graphical user interface operations, managing windowing systems, graphics rendering, and user interface elements that form the core of desktop interactions. The vulnerability arises from improper handling of objects in memory, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access. The Win32k.sys driver operates at kernel level with the highest privileges, making any flaw within its memory management mechanisms particularly dangerous as it directly impacts the operating system's security boundaries.
The technical nature of this vulnerability stems from insufficient validation and proper object handling within the Win32k component's memory management subsystem. When Windows processes graphical operations or user interface interactions, it relies on Win32k.sys to manage various kernel-mode objects such as window handles, graphics contexts, and user interface resources. The flaw manifests when the driver fails to properly validate or sanitize memory objects during specific operations, potentially allowing attackers to manipulate kernel memory structures through crafted input or malicious applications. This memory handling deficiency creates a condition where arbitrary code execution can occur within kernel space, bypassing standard security mechanisms that typically protect against user-mode privilege escalation attacks.
The operational impact of CVE-2020-0723 extends far beyond typical privilege escalation scenarios, as successful exploitation can result in complete system compromise and persistent access to target environments. Attackers leveraging this vulnerability can gain system-level privileges without requiring physical access or elevated credentials, making it particularly attractive for remote exploitation campaigns. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, creating widespread exposure across enterprise environments. Once exploited, attackers can establish persistent backdoors, extract sensitive data, deploy additional malware, or use the compromised system as a launch point for further network infiltration activities.
Mitigation strategies for this vulnerability primarily focus on immediate patch deployment through Microsoft's regular security updates, as the official fix addresses the underlying memory handling flaws within Win32k.sys. Organizations should prioritize patch management processes to ensure all affected systems receive the necessary security updates promptly. Additional defensive measures include implementing application whitelisting policies to restrict unauthorized code execution, enabling exploit protection features such as Windows Defender Application Control, and monitoring for anomalous system behavior that might indicate exploitation attempts. Security teams should also consider implementing network segmentation and privilege separation controls to limit the potential impact of successful exploitation, while maintaining comprehensive monitoring of kernel-mode activities and system calls that could indicate malicious manipulation of Win32k components. This vulnerability aligns with CWE-121 and CWE-122 categories related to improper restriction of operations within a memory buffer, and maps to attack patterns in the MITRE ATT&CK framework under privilege escalation techniques that leverage kernel-mode vulnerabilities.