CVE-2017-8466 in Windows
Summary
by MITRE
Windows Cursor in Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and Windows Server 2016 allows improper elevation of privilege, aka "Windows Cursor Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 08/20/2024
The Windows Cursor Elevation of Privilege Vulnerability represents a critical security flaw in multiple Windows operating systems that enables attackers to escalate their privileges from standard user level to administrator level. This vulnerability specifically affects Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 versions 1511 and 1607, and Windows Server 2016. The flaw resides in how the Windows cursor handling mechanism processes certain cursor files, creating an improper privilege elevation scenario that directly violates the principle of least privilege and system security boundaries.
The technical root cause of this vulnerability stems from inadequate validation of cursor files within the Windows operating system. When Windows processes cursor files, particularly those with maliciously crafted content, the system fails to properly validate the file format and content before executing cursor-related operations. This improper validation allows attackers to manipulate cursor files in such a way that they can execute arbitrary code with elevated privileges. The vulnerability manifests when a user interacts with a specially crafted cursor file, triggering a code execution path that bypasses normal security restrictions and privilege checks. This flaw falls under CWE-170, which addresses improper input handling and validation issues, specifically in the context of file processing and privilege management.
The operational impact of this vulnerability is severe and far-reaching across enterprise environments. Attackers can leverage this weakness to gain unauthorized administrative access to systems, potentially leading to complete system compromise and data exfiltration. The vulnerability affects both desktop and server environments, making it particularly dangerous for organizations running multiple Windows versions simultaneously. Once exploited, attackers can establish persistent access, deploy additional malware, modify system configurations, and potentially move laterally within networks to compromise additional systems. The ease of exploitation through simple cursor file manipulation makes this vulnerability particularly attractive to threat actors, as it requires minimal technical expertise to implement.
Organizations should implement immediate mitigations including applying the relevant security patches released by Microsoft, which address the underlying cursor file validation issues. Network segmentation and user access controls should be strengthened to limit potential impact if exploitation occurs. Security monitoring should be enhanced to detect suspicious cursor file usage patterns and unexpected privilege escalation events. The vulnerability demonstrates the importance of proper input validation and privilege separation in system design, aligning with ATT&CK technique T1068 which covers privilege escalation through local exploitation. System administrators should also consider implementing application whitelisting policies to prevent execution of unauthorized cursor files and maintain comprehensive audit logs to track cursor file interactions. Additionally, regular security assessments and vulnerability scanning should be conducted to identify any potential exploitation attempts and ensure system integrity.