CVE-2020-0797 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-2020-0800, CVE-2020-0864, CVE-2020-0865, CVE-2020-0866, CVE-2020-0897.
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Analysis
by VulDB Data Team • 04/10/2024
The vulnerability identified as CVE-2020-0797 represents a critical elevation of privilege flaw within the Windows Work Folder Service component of Microsoft operating systems. This vulnerability stems from improper handling of file operations within the work folder service architecture, creating a pathway for malicious actors to escalate their privileges from standard user level to administrative access. The Windows Work Folder Service is designed to provide centralized file management and synchronization capabilities for enterprise environments, making it a prime target for attackers seeking to gain elevated system privileges. The flaw specifically manifests in how the service processes file operations, allowing unauthorized code execution with higher privileges than initially granted to the user account.
The technical exploitation of this vulnerability occurs through manipulation of file operations within the work folder service context. When legitimate file operations are processed by the service, the system fails to properly validate or sanitize the input parameters, creating opportunities for privilege escalation attacks. This type of flaw typically falls under the CWE-264 category of "Permissions, Privileges and Access Controls" and aligns with ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation." The vulnerability exists in the service's handling of file system operations, where insufficient input validation allows attackers to craft malicious file operations that trigger the service to execute code with elevated privileges. Attackers can leverage this by creating specific file structures or triggering particular file operation sequences that exploit the flawed validation logic.
From an operational perspective, this vulnerability poses significant risk to enterprise environments that utilize Windows Work Folder services for file synchronization and management. Organizations relying on this service for business-critical operations face potential compromise of their entire network infrastructure if an attacker successfully exploits this vulnerability. The impact extends beyond individual system compromise to include potential lateral movement within the network, as attackers who gain administrative privileges can access sensitive data, modify system configurations, and establish persistent access points. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly concerning for large enterprise deployments. The attack surface is widened by the fact that work folder services are commonly enabled in corporate environments, increasing the likelihood of exploitation.
Mitigation strategies for CVE-2020-0797 should include immediate implementation of Microsoft security patches released in the May 2020 security updates, which address the specific flaw in file operation handling within the work folder service. Organizations should also implement network segmentation to limit access to work folder service endpoints and enforce strict access controls for work folder service configurations. The principle of least privilege should be enforced by limiting user accounts from having unnecessary permissions within the work folder service context. Additionally, monitoring for unusual file operations within work folder service logs should be implemented to detect potential exploitation attempts. Security teams should consider disabling work folder services if they are not essential to business operations, as this eliminates the attack surface entirely. The vulnerability also highlights the importance of regular security assessments and vulnerability scanning to identify and remediate similar privilege escalation flaws in other Windows services and components. Organizations should also implement security awareness training to help prevent social engineering attacks that might be used to gain initial access to systems before exploiting this vulnerability.