CVE-2018-0822 in Windows
Summary
by MITRE
NTFS in Windows 10 Gold, 1511, 1607, 1703 and 1709, Windows Server 2016 and Windows Server, version 1709 allows an elevation of privilege vulnerability due to the way NTFS handles objects, aka "Windows NTFS Global Reparse Point Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 10/12/2025
The vulnerability described in CVE-2018-0822 represents a critical elevation of privilege flaw within the NTFS file system implementation across multiple Windows operating systems including Windows 10 versions 1511, 1607, 1703, and 1709, as well as Windows Server 2016 and Windows Server version 1709. This issue stems from the improper handling of global reparse points within the NTFS file system, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access. The vulnerability specifically targets the way Windows NTFS processes reparse point objects, which are used to implement various file system features including symbolic links, hard links, and other advanced file system operations.
The technical flaw manifests when the NTFS file system fails to properly validate or sanitize global reparse point operations, allowing an attacker to manipulate these objects in ways that bypass normal security boundaries. This improper object handling creates a condition where a local attacker with standard user privileges can exploit the reparse point mechanism to gain elevated privileges. The vulnerability operates at the kernel level within the file system driver, making it particularly dangerous as it can be leveraged to execute arbitrary code with system-level privileges. This represents a classic case of inadequate input validation and privilege separation within the operating system's core file system components, aligning with CWE-248, which addresses "Uncaught Exception" in software systems. The flaw essentially allows for privilege escalation through manipulation of file system metadata structures that should normally be protected from user-level modification.
The operational impact of this vulnerability is severe as it enables attackers to achieve system-level compromise without requiring initial administrative access or sophisticated exploitation techniques. Once exploited, the vulnerability provides attackers with complete control over the affected system, allowing them to install malware, modify system files, access sensitive data, and potentially establish persistent backdoors. The attack surface is particularly broad since the vulnerability affects multiple Windows versions simultaneously, making it a high-value target for attackers seeking to maximize their exploitation potential. The vulnerability can be exploited through various attack vectors including malicious file creation, manipulation of existing file system objects, or by leveraging other vulnerabilities to gain initial access before utilizing the privilege escalation mechanism. This vulnerability directly aligns with ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation" and represents a fundamental weakness in the operating system's privilege model.
Mitigation strategies for CVE-2018-0822 focus on both immediate patching and operational security measures. Microsoft released security updates for all affected Windows versions that address the improper handling of global reparse points in the NTFS implementation. Organizations should prioritize immediate deployment of these patches across all affected systems to eliminate the vulnerability at its source. Additionally, system administrators should implement enhanced monitoring for suspicious file system activities, particularly around reparse point creation and modification operations. The principle of least privilege should be enforced through careful user account management and the limitation of administrative privileges. Network segmentation and access controls can help reduce the potential impact of successful exploitation by limiting what an attacker can access once they achieve elevated privileges. Security teams should also consider implementing file system integrity monitoring solutions that can detect anomalous reparse point behaviors and alert on potential exploitation attempts. The vulnerability demonstrates the critical importance of proper kernel-level validation and the need for comprehensive security testing of core operating system components, particularly those handling file system metadata and privilege boundaries.