CVE-2023-24860 in Malware Protection Engine
Summary
by MITRE • 04/12/2023
Microsoft Defender Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 04/28/2023
Microsoft Defender for Endpoint contains a denial of service vulnerability that stems from improper input validation within its threat detection mechanisms. This weakness allows authenticated attackers with low privileges to trigger a denial of service condition that affects the Defender service operation. The vulnerability specifically manifests when the system processes maliciously crafted input data that is not properly sanitized before being analyzed by the Defender components. The flaw exists in the way Defender handles certain file formats and data structures during real-time scanning operations, leading to service instability and potential system unresponsiveness. According to CWE-20, this vulnerability represents a classic input validation error where the system fails to properly validate or sanitize user-supplied data before processing it. The impact extends beyond simple service disruption as it can affect the overall security posture of systems relying on Microsoft Defender for protection. Attackers can exploit this weakness by crafting specific payloads that cause the Defender service to consume excessive resources or enter an error state, effectively rendering the protection mechanism ineffective. The vulnerability affects multiple versions of Windows operating systems including Windows 10, Windows 11, and various server editions that have Microsoft Defender installed. From an operational perspective, this vulnerability creates a significant risk for enterprise environments where Defender is actively monitoring network traffic and file systems. The attack surface is broad since the flaw can be triggered through various input vectors including email attachments, downloaded files, and network shares that are scanned by Defender. This issue aligns with ATT&CK technique T1499 which covers resource hijacking and denial of service attacks. The vulnerability's exploitation requires minimal privileges and can be executed remotely, making it particularly dangerous for organizations with insufficient network segmentation. Organizations may experience service interruptions that could potentially delay threat detection and response times, creating windows of opportunity for more sophisticated attacks to occur. The flaw demonstrates how security products themselves can become attack vectors when proper input validation mechanisms are not implemented. Microsoft has released patches addressing this vulnerability through regular security updates, but organizations must ensure timely deployment to maintain effective protection. The vulnerability underscores the importance of implementing layered security approaches where reliance on a single protection mechanism is avoided. System administrators should monitor for unusual Defender service behavior and implement additional monitoring solutions to detect potential exploitation attempts. Security teams must consider the operational impact of this vulnerability when planning incident response procedures, as the service disruption could mask other security events. The exploitability of this vulnerability highlights the need for continuous security testing and validation of security products to prevent them from becoming entry points for attackers. Organizations should review their access controls and privilege management policies to limit the potential impact of such vulnerabilities. Regular security assessments should include testing the resilience of security products against denial of service attacks to ensure they maintain operational integrity under adversarial conditions. The vulnerability serves as a reminder that even security tools require robust input validation and error handling to prevent them from being compromised by malicious inputs.