CVE-2019-1389 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 CVE ID is unique from CVE-2019-1397, CVE-2019-1398.
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Analysis
by VulDB Data Team • 02/11/2024
The vulnerability identified as CVE-2019-1389 represents a critical remote code execution flaw within Microsoft Windows Hyper-V virtualization infrastructure. This security weakness specifically affects host servers running Hyper-V hypervisors and arises from inadequate input validation mechanisms when processing data from authenticated guest operating systems. The vulnerability stems from the hypervisor's failure to properly sanitize and validate user inputs originating from virtual machine environments, creating a potential attack vector that could allow malicious actors to execute arbitrary code on the host system. The flaw is particularly concerning because it leverages the trust relationship between host and guest systems, exploiting the legitimate communication channels that exist within virtualized environments.
From a technical perspective, this vulnerability operates at the hypervisor level where the Windows Hyper-V implementation fails to adequately validate input parameters received from guest operating systems. The flaw typically manifests when authenticated users within a guest VM attempt to manipulate system resources through crafted inputs that bypass normal validation checks. This type of vulnerability falls under the CWE-20 category, which specifically addresses "Improper Input Validation" and represents a fundamental security weakness in the input processing pipeline. The vulnerability enables attackers to exploit the trust relationship between virtual machine components and the underlying host infrastructure, potentially allowing privilege escalation and complete system compromise.
The operational impact of CVE-2019-1389 extends beyond simple code execution, as it fundamentally undermines the security isolation that virtualization technologies are designed to provide. Attackers who successfully exploit this vulnerability can potentially gain elevated privileges on the host system, allowing them to access sensitive data, manipulate other virtual machines, or establish persistent backdoors within the virtualized environment. This weakness particularly affects enterprise environments that rely heavily on Hyper-V for server virtualization, as it could enable attackers to move laterally across multiple virtualized workloads. The vulnerability's remote execution capability means that attackers do not require physical access to the host system, making it especially dangerous in cloud computing and multi-tenant environments where proper isolation is critical.
Organizations should implement immediate mitigations including applying Microsoft security patches as soon as they become available, implementing network segmentation to limit guest-to-host communication, and monitoring for anomalous behavior in virtualized environments. The vulnerability aligns with several ATT&CK techniques including T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation. Security teams should also consider implementing hypervisor-level monitoring and logging to detect potential exploitation attempts. Additionally, organizations should review their virtual machine configurations to ensure proper isolation controls are in place, and consider implementing zero-trust network principles even within virtualized environments. The remediation process should include comprehensive testing of patches in non-production environments before deployment to ensure system stability while addressing the critical security exposure.