CVE-2020-1364 in Windows
Summary
by MITRE
A denial of service vulnerability exists in the way that the WalletService handles files, aka 'Windows WalletService Denial of Service Vulnerability'.
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Analysis
by VulDB Data Team • 10/30/2020
The Windows WalletService denial of service vulnerability represents a critical security flaw that affects the Windows operating system's wallet service functionality. This vulnerability specifically manifests in the improper handling of files by the WalletService component, which is responsible for managing digital wallets and associated cryptographic operations. The issue stems from inadequate input validation and file processing mechanisms within the service, creating an avenue for malicious actors to disrupt normal system operations through carefully crafted file inputs.
The technical implementation of this vulnerability involves the WalletService failing to properly validate file structures and content when processing wallet-related data. When malformed or specially crafted files are presented to the service, the system experiences unexpected behavior leading to complete service disruption. This flaw operates at the system level where the service processes file inputs without sufficient sanitization checks, allowing an attacker to trigger a denial of service condition that renders the wallet functionality completely inoperable. The vulnerability is classified under the Common Weakness Enumeration framework as a weakness related to improper input validation and resource management.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where Windows WalletService is actively utilized for credential management, digital signatures, and secure authentication processes. The impact extends beyond simple service interruption as it affects the broader security infrastructure that relies on proper wallet functionality for authentication and authorization. Attackers can exploit this weakness to cause widespread disruption across multiple systems, particularly in environments where automated wallet services and credential management systems are prevalent. The vulnerability's exploitation requires minimal privileges and can be executed through simple file manipulation techniques, making it particularly dangerous in production environments.
The security implications of this vulnerability align with ATT&CK framework techniques related to service disruption and resource exhaustion. Adversaries can leverage this weakness to perform persistent denial of service attacks against wallet services, potentially affecting user productivity and system availability. Organizations should consider implementing immediate mitigations including disabling unnecessary wallet service functionality, implementing strict file validation policies, and monitoring for anomalous file processing activities. Additionally, regular system updates and patches should be prioritized to address the underlying service implementation flaws that enable this vulnerability.
Mitigation strategies should focus on both immediate operational controls and long-term architectural improvements. System administrators should consider implementing network segmentation to limit access to wallet service components and establish monitoring protocols for unusual file processing patterns. The vulnerability demonstrates the importance of proper input validation and resource handling in security-critical services, emphasizing the need for comprehensive security testing of system components. Organizations should also implement robust incident response procedures that account for service disruption scenarios and maintain backup authentication mechanisms to ensure continued operational capability during vulnerability exploitation attempts.