CVE-2020-1088 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-2020-1021, CVE-2020-1082.
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Analysis
by VulDB Data Team • 10/17/2020
The Windows Error Reporting elevation of privilege vulnerability represents a critical security flaw in Microsoft's Windows operating system that allows attackers to escalate their privileges from standard user level to system level. This vulnerability specifically affects the Windows Error Reporting component which is designed to collect and submit diagnostic information about system crashes and errors to Microsoft for analysis. The flaw manifests when WER processes and executes files that contain malicious code, creating an opportunity for unauthorized privilege escalation. Security researchers have identified this vulnerability as distinct from other related issues such as CVE-2020-1021 and CVE-2020-1082, indicating its unique nature and attack surface.
The technical implementation of this vulnerability stems from improper handling of file execution within the Windows Error Reporting framework. When a malicious file is processed by WER, the system fails to properly validate or sanitize the file contents before execution, allowing arbitrary code to run with elevated privileges. This occurs because WER does not adequately verify the integrity of files it processes, particularly those that might be crafted to exploit the privilege escalation mechanism. The vulnerability is classified under CWE-264, which specifically addresses permissions, privileges, and access control issues, making it a direct violation of proper privilege separation principles. Attackers can leverage this flaw by creating specially crafted error reports or crash dumps that contain malicious payloads, which then execute with system-level privileges when processed by WER.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system control and access to all user data, system resources, and network communications. Once an attacker achieves system-level privileges through this vulnerability, they can install malicious software, modify system files, access sensitive data, and potentially establish persistence mechanisms within the compromised system. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1068 which covers local privilege escalation, and T1059 which involves execution through command and scripting interpreters, providing attackers with multiple pathways to exploit the system.
Mitigation strategies for this vulnerability primarily focus on immediate patching and system hardening measures. Microsoft released security updates that address the privilege escalation flaw by implementing proper file validation and execution controls within the Windows Error Reporting component. Organizations should prioritize applying these patches across all affected systems, particularly those running vulnerable Windows versions. Additional protective measures include disabling unnecessary error reporting features, implementing strict file access controls, and monitoring for unusual WER activity that might indicate exploitation attempts. Security teams should also consider implementing application whitelisting policies that restrict execution of potentially malicious files through WER, and establish network monitoring to detect suspicious privilege escalation activities that might indicate exploitation of this vulnerability. The vulnerability demonstrates the importance of proper privilege separation and input validation in system components that handle user-generated content or external data processing.