CVE-2021-1686 in Windows
Summary
by MITRE • 01/13/2021
Windows WalletService Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-1681, CVE-2021-1687, CVE-2021-1690.
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Analysis
by VulDB Data Team • 10/09/2024
The Windows WalletService elevation of privilege vulnerability identified as CVE-2021-1686 represents a critical security flaw within Microsoft's Windows operating system that allows attackers to escalate their privileges from standard user level to system level execution. This vulnerability specifically targets the WalletService component which manages digital wallet functionality and credential storage within Windows environments. The flaw enables malicious actors to exploit a privilege escalation vector that bypasses normal access controls and authentication mechanisms, potentially leading to complete system compromise. The vulnerability is particularly concerning because it operates at the service level where legitimate system processes interact with user credentials and sensitive data. According to the Common Weakness Enumeration framework, this vulnerability maps to CWE-269 which describes improper privilege management in software components. The ATT&CK framework categorizes this under privilege escalation techniques where adversaries leverage service vulnerabilities to gain elevated system access.
The technical implementation of this vulnerability stems from improper access control mechanisms within the WalletService Windows component. When the service processes certain inputs or requests, it fails to properly validate the privileges of the calling process or user context. This allows a local attacker with standard user privileges to manipulate service calls or inject malicious code that executes with elevated privileges. The flaw typically manifests when the WalletService handles specific API calls or file operations that should only be accessible to system-level processes or administrators. Attackers can exploit this by crafting specific payloads or leveraging existing service interaction patterns to trigger the privilege escalation condition. The vulnerability exists in the Windows kernel mode components where service interactions occur, making it particularly dangerous as it can be exploited without requiring physical access or complex attack chains.
The operational impact of CVE-2021-1686 extends beyond simple privilege escalation to potentially enable full system compromise and data exfiltration capabilities. Once an attacker achieves system-level privileges through this vulnerability, they can access all system resources, modify critical files, install persistent backdoors, and extract sensitive information from the compromised system. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, making it a widespread concern for enterprise environments. Organizations running these affected systems face significant risk of lateral movement within their networks, as attackers can use the elevated privileges to access other systems and resources. The vulnerability can be exploited through various attack vectors including malicious applications, compromised software installations, or even social engineering campaigns that trick users into executing malicious code that leverages this privilege escalation mechanism.
Mitigation strategies for CVE-2021-1686 should focus on immediate patch deployment as the primary defense mechanism, with Microsoft releasing security updates to address the underlying privilege management flaw. Organizations should implement the principle of least privilege and ensure that user accounts operate with minimal required permissions to reduce the potential impact of exploitation. Network segmentation and monitoring solutions should be deployed to detect unusual service interactions or privilege escalation attempts that might indicate exploitation activity. Security teams should also consider implementing application whitelisting policies to prevent unauthorized code execution that could leverage this vulnerability. The vulnerability highlights the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments to identify and remediate similar privilege escalation flaws. Additionally, system administrators should monitor service logs and audit trails for suspicious activity that could indicate attempts to exploit this or similar vulnerabilities. According to industry best practices and security frameworks, organizations should maintain comprehensive incident response procedures specifically designed to handle privilege escalation attacks and ensure rapid containment and remediation of such security incidents.