CVE-2020-17037 in Windows
Summary
by MITRE • 11/11/2020
Windows WalletService Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 12/05/2020
The Windows WalletService Elevation of Privilege Vulnerability represents a critical security flaw in Microsoft Windows operating systems that allows attackers to escalate their privileges from standard user level to SYSTEM level access. This vulnerability specifically affects the WalletService component which manages digital wallets and credential storage functionalities within the Windows ecosystem. The flaw exists in how the service handles certain privilege checks and access controls, creating an opportunity for malicious actors to exploit the system's security model. According to the Common Weakness Enumeration framework, this vulnerability maps to CWE-276, which describes improper privilege management, and aligns with ATT&CK technique T1068, which covers exploit for privilege escalation.
The technical implementation of this vulnerability stems from insufficient validation of access tokens and security descriptors within the WalletService. When a user interacts with wallet functionality, the service fails to properly verify the privileges of the calling process, allowing an attacker to manipulate the service into executing operations with elevated permissions. This occurs due to improper handling of named pipe access controls and insufficient validation of the security context in which the WalletService operates. The vulnerability is particularly concerning because it leverages legitimate Windows service functionality to achieve privilege escalation, making detection more challenging for security monitoring systems.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to gain complete system control and access to all stored credentials, personal data, and sensitive information within the compromised system. Attackers can exploit this vulnerability to install persistent backdoors, extract sensitive data, and maintain long-term access to target systems. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, making it a widespread concern for enterprise environments where these operating systems are deployed. Security researchers have noted that this vulnerability can be exploited through various attack vectors including malicious applications, compromised software installations, or direct exploitation of the service interface.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security patches and updates, which address the underlying privilege management issues in WalletService. Organizations should also implement additional security controls such as monitoring for unusual WalletService activity, restricting access to wallet functionality through group policy settings, and ensuring proper network segmentation to limit the potential impact of exploitation. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies. Security teams should also consider implementing application whitelisting policies to prevent unauthorized applications from interacting with the WalletService, as this can significantly reduce the attack surface and prevent exploitation attempts. Regular security assessments and penetration testing should be conducted to identify and remediate similar privilege escalation vulnerabilities within the Windows environment.