CVE-2017-8714 in Windows
Summary
by MITRE
The Windows Hyper-V component on Microsoft Windows 8.1, Windows Server 2012 Gold and R2,, Windows 10 1607, and Windows Server 2016 allows a remote code execution vulnerability when it fails to properly validate input from an authenticated user on a guest operating system, aka "Remote Desktop Virtual Host Remote Code Execution Vulnerability".
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Analysis
by VulDB Data Team • 01/12/2021
The vulnerability identified as CVE-2017-8714 resides within the Windows Hyper-V hypervisor component, specifically affecting multiple Microsoft Windows operating systems including Windows 8.1, Windows Server 2012 Gold and R2, Windows 10 version 1607, and Windows Server 2016. This represents a critical security flaw that enables remote code execution through improper input validation mechanisms within the Hyper-V virtualization framework. The vulnerability is particularly concerning because it operates at the hypervisor level, where it can potentially allow malicious actors to escape from virtual machine isolation boundaries and execute arbitrary code on the host system.
The technical flaw manifests when the Hyper-V component fails to properly validate input data provided by authenticated users within guest operating systems. This improper validation occurs within the Remote Desktop Virtual Host functionality, which is responsible for managing virtualized remote desktop connections. The vulnerability stems from insufficient sanitization of user-supplied data that flows through the hypervisor's input processing pipeline, creating a pathway for malicious input to be interpreted as executable code rather than benign data. This type of vulnerability is categorized under CWE-20, which addresses "Improper Input Validation," and represents a classic example of how input validation failures at privileged levels can lead to severe privilege escalation scenarios.
The operational impact of CVE-2017-8714 extends beyond traditional remote code execution threats, as it fundamentally compromises the security isolation that virtualization technologies are designed to provide. An authenticated attacker within a guest virtual machine can potentially leverage this vulnerability to execute code with the privileges of the host system, effectively breaking down the security boundaries between virtual machines and the underlying physical infrastructure. This scenario enables attackers to perform lateral movement across multiple virtualized environments, potentially gaining access to sensitive data, escalating privileges to system-level access, and establishing persistent backdoors within the virtualized infrastructure. The vulnerability aligns with ATT&CK technique T1059, which covers "Command and Scripting Interpreter," and T1068, "Exploitation for Privilege Escalation," as it allows for both command execution and privilege escalation within the virtualized environment.
Mitigation strategies for CVE-2017-8714 require immediate deployment of Microsoft security patches, as the vulnerability was addressed through the August 2017 security updates. Organizations should prioritize patching all affected systems, particularly those running Hyper-V workloads in production environments where guest virtual machines are accessible to untrusted users. Network segmentation and access controls should be implemented to limit guest VM access to trusted administrators only, reducing the attack surface for potential exploitation. Additionally, monitoring solutions should be configured to detect anomalous behavior patterns that might indicate exploitation attempts, including unusual network connections or process execution patterns. The vulnerability highlights the importance of maintaining up-to-date virtualization security controls and demonstrates the critical nature of hypervisor-level security in modern enterprise environments where virtualization is extensively utilized for infrastructure consolidation and resource optimization.