CVE-2019-0550 in Windows
Summary
by MITRE
A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system, aka "Windows Hyper-V Remote Code Execution Vulnerability." This affects Windows 10 Servers, Windows 10, Windows Server 2019. This CVE ID is unique from CVE-2019-0551.
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Analysis
by VulDB Data Team • 06/23/2023
The vulnerability identified as CVE-2019-0550 represents a critical remote code execution flaw within Microsoft Windows Hyper-V virtualization platform that stems from inadequate input validation mechanisms. This security weakness specifically manifests when a host server running Hyper-V fails to properly validate input data originating from authenticated users within guest operating systems, creating a potential attack vector that could allow malicious actors to execute arbitrary code on the host system. The vulnerability affects multiple Windows operating systems including Windows 10 Servers, Windows 10, and Windows Server 2019, making it particularly concerning given the widespread deployment of these platforms in enterprise environments. The flaw operates at the hypervisor level where guest operating systems can potentially exploit insufficient validation controls to gain elevated privileges and execute malicious code on the underlying host infrastructure. This vulnerability is classified under CWE-20, which represents "Improper Input Validation," a fundamental weakness that occurs when software does not properly validate or sanitize input data before processing it, leading to potential security breaches and system compromise.
The operational impact of CVE-2019-0550 extends beyond simple privilege escalation, as it enables attackers to potentially establish persistent access to critical infrastructure while maintaining stealth within the virtualized environment. An attacker exploiting this vulnerability could leverage the compromised host system to pivot to other network segments, escalate privileges further, and access sensitive data or systems that are typically isolated within virtual environments. The attack surface is particularly significant because Hyper-V environments often host multiple virtual machines with varying security postures, meaning a successful exploitation could provide access to multiple systems within the same physical host. This vulnerability aligns with ATT&CK technique T1059, which covers "Command and Scripting Interpreter" and T1078, covering "Valid Accounts," as attackers could potentially use compromised host systems to execute commands and maintain access through legitimate credentials. The flaw essentially undermines the fundamental security isolation that virtualization platforms are designed to provide, creating a scenario where guest operating systems can breach their containment boundaries and compromise the host infrastructure.
Mitigation strategies for CVE-2019-0550 should focus on immediate patch management implementation as Microsoft released security updates addressing this specific vulnerability through their regular security bulletins. Organizations must prioritize deployment of the relevant security patches across all affected Windows systems to eliminate the exploitation risk. Additional protective measures include implementing network segmentation to limit communication between virtual machines and hosts, disabling unnecessary Hyper-V features that could be exploited, and monitoring for suspicious activity in virtualized environments that might indicate exploitation attempts. Security teams should also consider implementing runtime protection solutions that can detect anomalous behavior patterns consistent with exploitation attempts, including unusual network connections, privilege escalation attempts, or unexpected code execution within virtual environments. The vulnerability demonstrates the importance of maintaining strict input validation controls at all levels of the computing stack, particularly within hypervisor implementations where security failures can have cascading effects across multiple virtualized systems. Organizations should also conduct regular security assessments of their virtualization environments to identify and remediate similar validation weaknesses that could potentially lead to similar vulnerabilities.