CVE-2020-0865 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Work Folder Service improperly handles file operations, aka 'Windows Work Folder Service Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0777, CVE-2020-0797, CVE-2020-0800, CVE-2020-0864, CVE-2020-0866, CVE-2020-0897.
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Analysis
by VulDB Data Team • 04/11/2024
The vulnerability identified as CVE-2020-0865 represents a critical elevation of privilege flaw within the Windows Work Folders Service component of Microsoft operating systems. This service enables users to synchronize files between their local devices and network servers, creating a seamless collaboration environment that bridges on-premises and cloud-based file management. The flaw specifically manifests in how the Work Folders Service processes file operations, creating a pathway for malicious actors to escalate their privileges from standard user level to administrative rights. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise environments where file synchronization services are commonly deployed. This issue is particularly significant because Work Folders is often used in corporate settings where sensitive data resides, and unauthorized privilege escalation could lead to complete system compromise.
The technical exploitation of this vulnerability stems from improper handling of file operations within the Work Folders Service implementation. Attackers can leverage this flaw by manipulating file system operations to gain elevated privileges without proper authentication or authorization. The service's inadequate validation of file operations allows for potential code execution or file manipulation that should normally be restricted to administrators. This misconfiguration creates a privilege boundary that can be crossed through carefully crafted file operations, potentially enabling attackers to modify system files, install malicious software, or access restricted data. The vulnerability aligns with CWE-269 Improper Privilege Management, which specifically addresses weaknesses in privilege handling mechanisms. The flaw exists at the service level where file operations are processed, indicating a fundamental issue in how the service validates and authorizes file system interactions.
The operational impact of CVE-2020-0865 extends beyond simple privilege escalation, as it can enable attackers to establish persistent access within targeted networks. Once an attacker achieves administrative privileges through this vulnerability, they can deploy additional malware, modify system configurations, or exfiltrate sensitive data without detection. The Work Folders Service typically runs with elevated privileges to perform its synchronization functions, making it an attractive target for attackers seeking to gain system-level access. Organizations that have Work Folders enabled may experience complete compromise if this vulnerability is exploited, as it provides a direct path to administrative control over affected systems. The vulnerability's impact is amplified in environments where Work Folders is used for critical business operations, as attackers could potentially disrupt business continuity or access confidential information. This type of vulnerability is categorized under the ATT&CK framework as Privilege Escalation techniques, specifically focusing on Service Execution and File and Directory Permissions Modification.
Mitigation strategies for CVE-2020-0865 should prioritize immediate patch deployment through Microsoft's security updates, as the vendor has released patches addressing this specific vulnerability. Organizations should disable the Work Folders Service if it is not essential for business operations, particularly in environments where the service is not properly secured. Network segmentation and access controls should be implemented to limit potential attack vectors, ensuring that only authorized users can access Work Folders functionality. Security monitoring should be enhanced to detect anomalous file operations that might indicate exploitation attempts, particularly around file creation, modification, or deletion activities. System administrators should conduct regular audits of Work Folders configurations and permissions to ensure that the service operates with minimal required privileges. The vulnerability's classification as a privilege escalation issue necessitates comprehensive incident response planning, including monitoring for signs of lateral movement and privilege abuse within the network. Organizations should also consider implementing additional security controls such as application whitelisting and mandatory access controls to reduce the attack surface and prevent exploitation of similar vulnerabilities in the future.