CVE-2020-1552 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Work Folder Service improperly handles file operations. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could exploit this vulnerability by running a specially crafted application on the victim system. The update addresses the vulnerability by correcting the way the Windows Work Folder Service handles file operations.
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-1552 represents a critical elevation of privilege flaw within the Windows Work Folder Service component. This service facilitates remote file access and synchronization capabilities for enterprise environments, making it a prime target for malicious actors seeking to escalate their privileges on compromised systems. The vulnerability stems from improper handling of file operations within the service, creating a pathway for unauthorized code execution with elevated privileges. Security researchers have classified this issue under CWE-264, which encompasses permissions, privileges, and access controls, specifically highlighting the improper handling of file operations that leads to privilege escalation.
The exploitation mechanism for CVE-2020-1552 involves an attacker crafting a malicious application that leverages the flawed file operation handling within the Windows Work Folder Service. This approach aligns with ATT&CK technique T1068, which focuses on local privilege escalation through the exploitation of system vulnerabilities. The vulnerability's impact is particularly concerning because it allows an attacker to execute processes in an elevated context, potentially gaining SYSTEM-level privileges that would enable complete system compromise. The flaw exists in the service's validation and processing of file operations, where insufficient input sanitization and access control checks permit malicious file operations to be executed with elevated privileges.
From an operational standpoint, this vulnerability presents significant risks to enterprise environments that utilize Windows Work Folders for remote file access and collaboration. Organizations relying on this service for business continuity and remote work capabilities face heightened exposure to sophisticated attacks targeting their file synchronization infrastructure. The vulnerability's exploitation requires only local execution of a crafted application, making it particularly dangerous in scenarios where attackers have already achieved initial access through other means such as phishing attacks or credential theft. Once exploited, the attacker could potentially access sensitive corporate data, establish persistent backdoors, or move laterally within the network using the elevated privileges gained through this vulnerability.
Microsoft addressed this vulnerability through a security update that specifically corrects the file operation handling within the Windows Work Folder Service. The patch implements proper input validation and access control mechanisms to prevent malicious file operations from being executed with elevated privileges. Organizations should prioritize deployment of this update across their enterprise environments, particularly in systems where Windows Work Folders are actively utilized. Security teams should also implement monitoring for suspicious file operations and privilege escalation attempts that could indicate exploitation of this vulnerability. The remediation process should include thorough testing of the update in controlled environments before widespread deployment to ensure compatibility with existing enterprise applications and workflows.