CVE-2019-1385 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resulting in access to system files.To exploit this vulnerability, an authenticated attacker would need to run a specially crafted application to elevate privileges.The security update addresses the vulnerability by correcting how AppX Deployment Extensions manages privileges., aka 'Windows AppX Deployment Extensions Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 02/08/2025
The vulnerability described in CVE-2019-1385 represents a critical elevation of privilege flaw within the Windows AppX Deployment Extensions component. This issue stems from improper privilege management mechanisms that allow malicious applications to gain unauthorized access to system-level resources. The vulnerability specifically affects the Windows operating system's handling of AppX package deployments and installations, which are integral to the modern Windows application ecosystem. When an application is installed or updated through the AppX deployment system, the underlying privilege management logic fails to properly enforce security boundaries, creating an exploitable condition that could allow attackers to escalate their privileges from standard user level to system level access.
The technical flaw manifests in the privilege management implementation within the AppX Deployment Extensions, which is responsible for handling the installation, update, and removal of Windows Store applications and other AppX packages. This component operates with elevated privileges to perform its core functions but fails to properly validate or restrict the privileges of applications attempting to interact with it. The vulnerability creates a path where an authenticated user can execute a malicious application that leverages this improper privilege management to gain system-level access. The flaw essentially allows for privilege escalation through the AppX deployment pipeline, bypassing normal security controls that should prevent non-privileged processes from accessing protected system resources.
From an operational impact perspective, this vulnerability poses significant security risks to Windows environments as it enables attackers with minimal privileges to potentially gain complete system control. An authenticated attacker who can successfully exploit this vulnerability can execute arbitrary code with system-level privileges, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The attack vector requires the target to execute a specially crafted application, making it a user-actionable exploit that could be delivered through social engineering, phishing campaigns, or other means of gaining initial access. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise environments.
The security update for CVE-2019-1385 addresses the vulnerability by correcting the privilege management logic within the AppX Deployment Extensions component. Microsoft implemented proper privilege validation and enforcement mechanisms that ensure only appropriately authorized processes can access system resources through the AppX deployment pipeline. This fix involves strengthening the security boundaries and access controls within the AppX deployment system to prevent unauthorized privilege escalation. Organizations should prioritize applying this update as it represents a critical security measure that directly addresses the core flaw in the Windows privilege management system. The vulnerability aligns with CWE-276, which covers improper privilege management, and maps to ATT&CK technique T1068, which involves exploiting vulnerabilities to gain system privileges. This vulnerability demonstrates the importance of proper privilege separation and access control in system components that handle application deployment and installation processes, as these components often operate with elevated privileges and require robust security controls to prevent exploitation.