CVE-2019-1017 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-2019-0960, CVE-2019-1014.
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Analysis
by VulDB Data Team • 05/20/2025
The vulnerability identified as CVE-2019-1017 represents a critical elevation of privilege flaw within the Windows operating system's Win32k component. This issue 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 serves as a crucial component in Windows graphical subsystem, managing user interface elements and system calls related to windowing operations. When this component fails to properly validate or manage memory objects, it creates exploitable conditions that can be leveraged by attackers to bypass security controls.
The technical exploitation of this vulnerability occurs through manipulation of the Win32k kernel component's memory management routines. Attackers can craft specific inputs or sequences that cause the kernel to process memory objects incorrectly, leading to privilege escalation. This flaw typically involves use-after-free conditions or improper memory deallocation scenarios where the kernel continues to reference freed memory locations. The vulnerability's classification under CWE-125 indicates improper initialization or handling of memory objects, while the attack vector aligns with techniques described in the ATT&CK framework under privilege escalation tactics. The flaw affects multiple Windows versions including Windows 7, Windows 8.1, Windows Server 2008 R2, and Windows Server 2012 R2, making it particularly concerning for enterprise environments.
The operational impact of CVE-2019-1017 is severe, as successful exploitation allows attackers to gain SYSTEM-level privileges on affected systems. This elevation enables full control over the compromised machine, including access to all user data, system files, and the ability to install malicious software or establish persistence mechanisms. The vulnerability can be exploited through various attack vectors including malicious documents, web-based attacks, or social engineering campaigns that trick users into executing malicious code. Organizations running affected Windows versions face significant risk of data breaches, lateral movement within networks, and potential establishment of persistent backdoors. The vulnerability's similarity to CVE-2019-0960 and CVE-2019-1014 highlights a broader pattern of memory management issues within the Win32k subsystem, suggesting potential for additional related vulnerabilities.
Mitigation strategies for CVE-2019-1017 primarily involve applying Microsoft security updates and patches released in the October 2019 security updates. System administrators should prioritize patch deployment across all affected Windows systems, particularly those running older versions of Windows 7 and Windows Server 2008 R2. Additional protective measures include implementing application control policies, disabling unnecessary Windows features, and monitoring for suspicious system behavior. The vulnerability's exploitation often requires user interaction, making user awareness training crucial for prevention. Network segmentation and privilege separation can limit the potential impact if exploitation occurs. Security teams should also implement monitoring for abnormal privilege escalation events and consider deploying exploit prevention technologies. Organizations should conduct vulnerability assessments to identify systems running unsupported Windows versions that may be vulnerable to this and related exploits. The ATT&CK framework suggests implementing detection measures for privilege escalation techniques and monitoring for suspicious Win32k-related system calls or memory operations that could indicate exploitation attempts.