CVE-2020-0719 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-2020-0720, CVE-2020-0721, CVE-2020-0722, CVE-2020-0723, CVE-2020-0724, CVE-2020-0725, CVE-2020-0726, CVE-2020-0731.
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Analysis
by VulDB Data Team • 03/29/2024
The vulnerability described in CVE-2020-0719 represents a critical elevation of privilege flaw within the Windows operating system's Win32k component, which serves as a fundamental subsystem responsible for graphical user interface management and windowing operations. This vulnerability specifically manifests when the Win32k subsystem fails to properly handle objects in memory, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. The issue stems from improper memory management practices within the kernel-mode driver components that handle graphical operations, making it particularly dangerous as it operates at the core of Windows security architecture.
The technical flaw in CVE-2020-0719 resides in the Win32k.sys kernel driver's inadequate validation of memory objects during graphical operations, which falls under the CWE-125 vulnerability category of out-of-bounds read conditions. This weakness allows attackers to manipulate memory objects in ways that bypass normal privilege checks and access controls, effectively enabling arbitrary code execution with the highest system privileges. The vulnerability is particularly insidious because it leverages legitimate Windows graphical subsystem functionality to achieve privilege escalation, making detection and prevention more challenging for traditional security measures. Attackers can exploit this flaw by crafting malicious graphical operations that trigger the memory handling error, causing the system to execute code with elevated privileges.
The operational impact of CVE-2020-0719 is severe and far-reaching across enterprise environments, as successful exploitation grants attackers complete control over affected systems. Once escalated to SYSTEM level, adversaries can access all system resources, modify critical files, establish persistence mechanisms, and potentially move laterally across networks. This vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for organizations relying on these platforms. The vulnerability's exploitation aligns with tactics described in the MITRE ATT&CK framework under privilege escalation techniques, specifically targeting the 'Windows Admin Shares' and 'Exploitation for Privilege Escalation' domains. Organizations that fail to patch this vulnerability face significant risk of data breaches, system compromise, and potential lateral movement throughout their networks.
Mitigation strategies for CVE-2020-0719 should prioritize immediate patch deployment through Microsoft's security updates, as the vendor has released patches specifically addressing the Win32k memory handling flaw. System administrators should implement additional security controls including restricting user privileges, monitoring for abnormal graphical subsystem activity, and deploying endpoint detection and response solutions that can identify exploitation attempts. The vulnerability's characteristics align with the principle of least privilege from cybersecurity best practices, emphasizing the importance of limiting user access rights and maintaining up-to-date security patches. Organizations should also consider implementing network segmentation to limit the potential impact of successful exploitation and establish robust incident response procedures to quickly detect and respond to any signs of compromise. Regular security assessments and vulnerability scanning should be conducted to ensure complete remediation across all affected systems.