CVE-2020-0806 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows Error Reporting (WER) when WER handles and executes files, aka 'Windows Error Reporting Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-0772.
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Analysis
by VulDB Data Team • 04/10/2024
The Windows Error Reporting Elevation of Privilege Vulnerability represents a critical security flaw in Microsoft's Windows operating system that allows malicious actors to escalate their privileges from standard user level to system administrator level. This vulnerability specifically affects the Windows Error Reporting component which is responsible for collecting and processing crash information from applications and system processes. The flaw exists in how WER handles and executes files, creating an opportunity for attackers to manipulate the error reporting mechanism and gain unauthorized system-level access. Security researchers have identified this issue as distinct from CVE-2020-0772, indicating it represents a separate attack surface with its own exploitation vectors and mitigation requirements.
The technical implementation of this vulnerability stems from improper handling of file execution within the Windows Error Reporting subsystem. When applications crash or encounter errors, WER typically collects diagnostic information and may execute certain files as part of its error processing routine. The flaw occurs when WER fails to properly validate or sanitize file paths, allowing attackers to craft malicious files that get executed with elevated privileges during the error reporting process. This weakness falls under the CWE-787 weakness category, which describes out-of-bounds write vulnerabilities that can be exploited to execute arbitrary code with higher privileges. The vulnerability is particularly dangerous because it leverages legitimate system components to bypass normal security controls, making detection and prevention more challenging for security professionals.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over affected systems. Once an attacker successfully exploits this vulnerability, they can install malware, modify system files, access sensitive data, and potentially establish persistent backdoors within the compromised environment. The attack surface is particularly concerning because Windows Error Reporting is active across all Windows installations and is frequently invoked when applications crash or when system errors occur. This means that even minor application failures could potentially trigger the exploit, making the vulnerability highly accessible to threat actors. The vulnerability also aligns with ATT&CK technique T1068, which describes the use of local privilege escalation to gain system-level access through legitimate system tools and processes.
Mitigation strategies for this vulnerability primarily focus on applying Microsoft's security patches and updates as soon as they become available. Organizations should prioritize patch management processes to ensure all Windows systems receive the necessary updates that address the WER privilege escalation flaw. Additionally, implementing network segmentation and access controls can help limit the potential damage if an attacker successfully exploits the vulnerability. Security teams should also monitor system logs for unusual error reporting activity and implement endpoint detection and response solutions that can identify suspicious file execution patterns. System administrators should consider disabling unnecessary error reporting features where possible and regularly review system configurations to ensure that WER is not executing untrusted code. The vulnerability demonstrates the importance of secure coding practices in system components and highlights how seemingly benign features like error reporting can become attack vectors when proper input validation and privilege separation are not implemented.