CVE-2020-0678 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when Windows Error Reporting manager improperly handles hard links, aka 'Windows Error Reporting Manager Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 03/29/2024
The vulnerability identified as CVE-2020-0678 represents a critical elevation of privilege flaw within the Windows Error Reporting manager component. This vulnerability stems from improper handling of hard links by the Windows Error Reporting service, which allows attackers to escalate their privileges from standard user level to SYSTEM level. The flaw specifically affects the way the error reporting manager processes file system hard links during the reporting process, creating a potential attack vector for privilege escalation.
The technical implementation of this vulnerability resides in the Windows Error Reporting manager's inadequate validation of hard link structures when processing crash reports or error logs. When a malicious user creates a hard link to a protected system file and then triggers the error reporting mechanism, the manager may inadvertently follow the hard link and execute code with elevated privileges. This behavior violates fundamental security principles and demonstrates poor input validation within the Windows error reporting subsystem. The vulnerability is categorized under CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on inadequate privilege management during file system operations.
From an operational perspective, this vulnerability poses significant risks to Windows environments as it allows attackers to gain SYSTEM-level access without requiring administrative credentials or complex exploitation techniques. The attack requires minimal privileges initially, making it particularly dangerous as it can be exploited by unauthenticated users or those with limited access rights. Once successfully exploited, the attacker gains complete control over the affected system, enabling them to install malware, modify system files, create new user accounts, or exfiltrate sensitive data. The impact extends beyond individual systems to potentially compromise entire network infrastructures, especially in environments where Windows Error Reporting is enabled and not properly configured.
The exploitation of this vulnerability aligns with ATT&CK technique T1068, which covers 'Local Port Forwarding' and 'Exploitation for Privilege Escalation', and also relates to T1059, 'Command and Scripting Interpreter', as attackers may leverage the elevated privileges to execute additional malicious payloads. Organizations should prioritize immediate remediation through Microsoft security updates and consider implementing additional controls such as disabling unnecessary error reporting services, restricting hard link creation capabilities, and monitoring for suspicious file system activity patterns. The vulnerability highlights the importance of proper file system access control mechanisms and demonstrates how seemingly benign system components can become attack vectors when not properly secured against malicious input handling.