CVE-2020-1010 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows Block Level Backup Engine Service (wbengine) that allows file deletion in arbitrary locations.To exploit the vulnerability, an attacker would first have to log on to the system, aka 'Microsoft Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1068, CVE-2020-1079.
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Analysis
by VulDB Data Team • 10/16/2020
The vulnerability described in CVE-2020-1010 represents a critical elevation of privilege flaw within the Windows Block Level Backup Engine Service, specifically affecting the wbengine component. This issue enables malicious actors to delete files in arbitrary locations on a compromised system, fundamentally undermining the integrity and security of the Windows operating environment. The vulnerability requires local system access for exploitation, meaning an attacker must first establish a foothold on the target machine before leveraging this privilege escalation mechanism. The Windows Block Level Backup Engine Service operates with elevated privileges to perform backup operations, making it a valuable target for attackers seeking to expand their control over the system.
The technical implementation of this vulnerability stems from improper access control mechanisms within the wbengine service, which fails to properly validate file paths and permissions during backup operations. This flaw allows an authenticated user to manipulate the backup engine's behavior to delete files outside of normal backup scope, effectively bypassing standard file system permission controls. The vulnerability specifically affects Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, where the backup engine service runs with elevated privileges. From a cybersecurity perspective, this represents a classic privilege escalation vector that can be exploited to remove critical system files, logs, or other security-relevant data, potentially facilitating further attacks or covering tracks. The flaw demonstrates poor input validation and inadequate privilege separation within the backup service architecture.
The operational impact of CVE-2020-1010 extends beyond simple file deletion capabilities, as it provides attackers with a mechanism to compromise system integrity and availability. An attacker who successfully exploits this vulnerability could remove critical system components, disable security features, or manipulate backup configurations to prevent legitimate recovery operations. This vulnerability directly violates the principle of least privilege and can be leveraged as a stepping stone for more sophisticated attacks, including data destruction, system compromise, or persistence establishment. The attack vector requires local access, which means the vulnerability is particularly concerning in environments where user accounts have legitimate access to systems, as it could be exploited by insider threats or through compromised legitimate accounts. Organizations with multiple users or shared systems face heightened risk from this vulnerability due to the potential for unauthorized privilege escalation.
Mitigation strategies for CVE-2020-1010 should focus on both immediate patching and operational security improvements. Microsoft released security updates in October 2020 that address this vulnerability through proper access control enforcement and privilege validation within the wbengine service. Organizations should prioritize applying these patches immediately to all affected Windows systems, particularly those running server or workstation versions that utilize backup services. Network segmentation and least privilege access controls can help limit the potential impact of exploitation by reducing the number of systems where local access might be obtained. Monitoring for unusual file deletion patterns, particularly in system directories, can help detect exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be used in conjunction with other attack paths to establish persistent access. The vulnerability also relates to CWE-284 (Improper Access Control) and CWE-732 (Incorrect Permission Assignment for Critical Resource) categories, highlighting the fundamental security misconfigurations that enabled this flaw. Security teams should also consider implementing additional controls such as file integrity monitoring, restricted user account permissions, and regular backup validation to ensure system recovery capabilities remain intact.