CVE-2020-17103 in Windows (GreenPlasma/MiniPlasma)
Summary
by MITRE • 12/10/2020
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 05/30/2026
The vulnerability identified as CVE-2020-17103 represents a critical elevation of privilege flaw within the Windows Cloud Files Mini Filter Driver component of Microsoft's operating systems. This vulnerability specifically affects the cloud storage integration functionality that allows users to access cloud-based file systems through the Windows file system interface. The issue stems from improper validation of input parameters within the mini filter driver that handles cloud file operations, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access. The affected systems include various versions of Windows 10 and Windows Server 2019, making this vulnerability particularly concerning given the widespread adoption of these platforms in enterprise environments.
The technical exploitation of this vulnerability occurs through a flaw in how the Cloud Files Mini Filter Driver processes certain file system operations that involve cloud storage synchronization. When a malicious user performs specific file operations that trigger the driver's handling routines, the improper input validation allows for memory corruption that can be leveraged to execute arbitrary code with elevated privileges. This vulnerability falls under the Common Weakness Enumeration category CWE-121, which deals with stack-based buffer overflows, and more specifically aligns with CWE-787, representing out-of-bounds write vulnerabilities that can lead to privilege escalation. The ATT&CK framework categorizes this issue under T1068, which involves exploiting legitimate credentials and system privileges to gain higher-level access, and T1059, covering the use of command and scripting interpreters to execute malicious code.
The operational impact of CVE-2020-17103 extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within affected systems. Once successfully exploited, the vulnerability allows threat actors to manipulate system files, install additional malware, and potentially establish backdoors for continued access. The cloud file integration functionality that triggers this vulnerability is commonly used in enterprise environments where users frequently access cloud storage services through standard file operations, making the attack surface particularly large. Organizations running Windows 10 and Windows Server 2019 systems without proper patch management are at significant risk, as the vulnerability can be exploited through legitimate user interactions with cloud storage services. The exploitation process typically requires minimal user interaction beyond normal file operations, making detection and prevention challenging for security teams.
Mitigation strategies for CVE-2020-17103 focus primarily on applying the Microsoft security patches released in the October 2020 security updates. Organizations should prioritize immediate deployment of the relevant patches across all affected systems, particularly those running Windows 10 version 1909 and Windows Server 2019. Additionally, implementing network segmentation and monitoring for unusual cloud file access patterns can help detect potential exploitation attempts. Security teams should consider disabling cloud file integration features when not required, as this reduces the attack surface for this particular vulnerability. The implementation of principle of least privilege access controls and regular security assessments can further minimize the impact if exploitation occurs. Microsoft recommends that administrators verify patch installation through system inventory management tools and monitor for any signs of exploitation through endpoint detection and response solutions. Organizations should also consider implementing application whitelisting policies to prevent unauthorized execution of potentially malicious code that could leverage this privilege escalation vulnerability.