CVE-2019-0730 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when Windows improperly handles calls to the LUAFV driver (luafv.sys), aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0836, CVE-2019-0841.
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Analysis
by VulDB Data Team • 10/19/2025
The vulnerability identified as CVE-2019-0730 represents a critical elevation of privilege flaw within the Windows operating system that specifically targets the LUAFV driver component. This issue stems from improper handling of certain system calls directed to the luafv.sys driver, which is responsible for managing file virtualization operations in Windows. The vulnerability allows malicious actors to escalate their privileges from standard user level to SYSTEM level access, effectively bypassing critical security controls that normally protect the operating system from unauthorized modifications. The LUAFV driver operates within the kernel space of Windows, making any exploitation of this flaw particularly dangerous as it can lead to complete system compromise. This vulnerability is classified under CWE-264, which specifically addresses permissions, privileges, and access controls, highlighting the fundamental security breach in how Windows manages driver interactions and privilege boundaries.
The technical exploitation of CVE-2019-0730 occurs through a specific flaw in the way Windows processes certain IOCTL (Input/Output Control) requests to the LUAFV driver. When a malicious application or attacker sends crafted requests to the luafv.sys driver, the system fails to properly validate the input parameters and access permissions, allowing for arbitrary code execution in kernel mode. This flaw is particularly insidious because it leverages legitimate Windows system components to achieve privilege escalation, making detection more difficult for traditional security measures. The vulnerability can be exploited through various attack vectors including malicious software installation, web-based attacks, or by leveraging other initial compromise methods. The flaw essentially creates a pathway for privilege escalation that bypasses normal Windows security mechanisms, enabling attackers to execute code with the highest possible privileges. According to ATT&CK framework, this vulnerability maps to T1068, which covers 'Exploitation for Privilege Escalation', demonstrating how attackers can leverage system-level weaknesses to gain elevated access.
The operational impact of CVE-2019-0730 is severe and far-reaching across enterprise environments, as successful exploitation provides attackers with complete control over affected systems. Once an attacker achieves SYSTEM-level privileges through this vulnerability, they can modify any file on the system, install malicious software, access sensitive data, and potentially establish persistence mechanisms. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for organizations. Organizations that fail to patch this vulnerability remain at significant risk of data breaches, system compromise, and potential lateral movement within their networks. The impact extends beyond individual system compromise as attackers can use this privilege escalation to gain access to network resources, domain controllers, and other critical infrastructure components. Security professionals must understand that this vulnerability can be exploited silently without user interaction, making it particularly dangerous in environments where users may not be aware of the compromise.
Mitigation strategies for CVE-2019-0730 should prioritize immediate patch deployment through Microsoft's security updates, as the vendor has released comprehensive fixes for this vulnerability. Organizations should implement network segmentation and access control measures to limit potential lateral movement if exploitation occurs, while also monitoring for suspicious system calls and privilege escalation attempts. The implementation of exploit prevention technologies such as Windows Defender Application Control or AppLocker can help prevent exploitation of this vulnerability by blocking unauthorized code execution. Additionally, security teams should conduct regular vulnerability assessments and penetration testing to identify systems that may be running unpatched versions of Windows. According to Microsoft's security guidance, organizations should also consider implementing runtime protection mechanisms and monitoring for unusual activity patterns that may indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against kernel-level exploits. Security administrators should also consider implementing automated patch management systems to ensure timely deployment of security updates across all affected systems.