CVE-2020-0793 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Diagnostics Hub Standard Collector Service improperly handles file operations, aka 'Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 04/10/2024
The vulnerability identified as CVE-2020-0793 represents a critical elevation of privilege flaw within the Windows operating system's diagnostics infrastructure. This weakness specifically affects the Diagnostics Hub Standard Collector Service which is responsible for collecting and managing diagnostic information from various system components. The vulnerability stems from improper handling of file operations within this service, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. The Diagnostics Hub Standard Collector Service operates with elevated privileges to perform its diagnostic functions, making it an attractive target for attackers seeking to leverage privilege escalation opportunities.
The technical implementation flaw manifests in how the service processes file operations and handles file system interactions. When the Diagnostics Hub Standard Collector Service processes certain diagnostic data or configuration files, it fails to properly validate or sanitize file paths and operations, potentially allowing attackers to manipulate file access patterns. This improper file handling can occur during service initialization, data collection processes, or when processing diagnostic reports. The vulnerability specifically relates to how the service manages file creation, modification, and access permissions, creating opportunities for attackers to exploit these weaknesses through crafted file operations or by manipulating the service's file handling routines.
The operational impact of this vulnerability is severe as it enables attackers to gain SYSTEM-level privileges without requiring authentication or specific exploitation techniques. Once an attacker successfully exploits this vulnerability, they can execute arbitrary code with the highest system privileges, potentially leading to complete system compromise. The attack surface is particularly concerning because the Diagnostics Hub Standard Collector Service runs with elevated privileges and is accessible to standard users, making the exploitation path relatively straightforward. This vulnerability can be leveraged for persistent access, data exfiltration, or further exploitation of other system components. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, making it a widespread concern for enterprise environments and individual users alike.
Security professionals should implement multiple layers of mitigation strategies to address this vulnerability. The most immediate and effective approach involves applying the official Microsoft security patches released for this vulnerability, which correct the improper file handling within the Diagnostics Hub Standard Collector Service. Additionally, system administrators should consider implementing strict access controls and monitoring for unusual file operations related to diagnostic services. The vulnerability aligns with CWE-787 which describes out-of-bounds write conditions, and can be mapped to ATT&CK technique T1068 which covers privilege escalation through exploitation of software vulnerabilities. Organizations should also consider disabling unnecessary diagnostic services when possible, implementing network segmentation to limit access to systems running these services, and conducting regular security assessments to identify potential exploitation attempts. Regular monitoring of system logs for suspicious diagnostic service activities and implementing endpoint detection and response solutions can help identify exploitation attempts before they result in successful privilege escalation.