CVE-2022-24548 in Malware Protection Engine
Summary
by MITRE • 04/15/2022
Microsoft Defender Denial of Service Vulnerability.
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Analysis
by VulDB Data Team • 04/17/2022
Microsoft Defender for Endpoint contains a denial of service vulnerability that arises from improper validation of user-supplied input during the processing of security events. This weakness allows an unauthenticated attacker to send specially crafted requests that cause the Defender service to consume excessive system resources or crash entirely. The vulnerability specifically affects the Windows Defender ATP service when handling certain types of security event data that are processed through the cloud-based analysis pipeline. The flaw exists in the validation logic that processes incoming telemetry data from endpoints, where insufficient input sanitization permits malformed data to trigger resource exhaustion conditions within the Defender backend systems.
The technical implementation of this vulnerability stems from a lack of proper bounds checking and input validation in the security event processing module. When Microsoft Defender receives security event data from endpoint agents, it performs various analyses including pattern matching and threat intelligence correlation. The vulnerability occurs when the service attempts to parse and process malformed event data that exceeds expected parameter limits or contains unexpected data structures. This allows an attacker to craft payloads that cause the Defender service to enter infinite loops or consume all available memory resources. The issue is particularly concerning because it affects the cloud-based security analysis components that process millions of events daily, making it a critical vector for service disruption.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise the overall security posture of organizations relying on Microsoft Defender. When the Defender service becomes unavailable due to resource exhaustion, it creates gaps in security monitoring and threat detection capabilities across the enterprise. This disruption can last from minutes to hours depending on the scale of the attack and the time required for system recovery. Organizations may experience delayed threat detection, failed security alerts, and reduced visibility into potential security incidents. The vulnerability also affects the availability of Defender for Endpoint management interfaces and reporting systems, further compounding the operational impact on security teams who depend on these tools for monitoring and incident response activities.
Mitigation strategies for this vulnerability should include immediate patch deployment as provided by Microsoft through regular security updates. Organizations should also implement network-level restrictions to limit access to Defender service endpoints and monitor for unusual patterns in security event processing. The implementation of rate limiting and input validation controls at the network perimeter can help prevent exploitation attempts from reaching the core Defender services. Additionally, security teams should establish monitoring protocols to detect resource exhaustion patterns and implement automated response mechanisms that can isolate affected components before they consume all available system resources. Organizations should also consider implementing redundant security monitoring solutions to maintain visibility even when primary Defender services are compromised, following the principle of defense in depth as recommended by cybersecurity frameworks such as the NIST Cybersecurity Framework.
This vulnerability aligns with CWE-400 which describes "Uncontrolled Resource Consumption" and represents a classic denial of service scenario. The attack pattern follows the techniques documented in the MITRE ATT&CK framework under the T1499 category for "Network Denial of Service" and T1566 for "Phishing" as attackers may use this vulnerability to disrupt security operations during phishing campaigns. Organizations should also consider implementing the principle of least privilege for Defender service accounts and ensure that access controls are properly configured to limit exposure to potential exploitation attempts. The vulnerability demonstrates the importance of input validation in cloud-based security services and highlights the need for robust error handling mechanisms in distributed security platforms.