CVE-2017-0178 in Hyper-V
Summary
by MITRE
A denial of service vulnerability exists when Microsoft Hyper-V running on Windows 10, Windows 10 1511, Windows 10 1607, Windows 8.1, Windows Server 2012 R2, and Windows Server 2016 host server fails to properly validate input from a privileged user on a guest operating system, aka "Hyper-V Denial of Service Vulnerability." This CVE ID is unique from CVE-2017-0179, CVE-2017-0182, CVE-2017-0183, CVE-2017-0184, CVE-2017-0185, and CVE-2017-0186.
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Analysis
by VulDB Data Team • 08/29/2020
The CVE-2017-0178 vulnerability represents a critical denial of service flaw within Microsoft Hyper-V hypervisor implementations across multiple Windows operating systems including Windows 10 versions 1511 and 1607, Windows 8.1, Windows Server 2012 R2, and Windows Server 2016. This vulnerability specifically targets the host server's validation mechanisms when processing input from guest operating systems, creating a pathway for malicious actors to disrupt normal system operations. The flaw stems from insufficient input validation procedures that fail to properly sanitize or verify data received from privileged users within virtual machine environments, allowing potentially harmful inputs to bypass security controls and potentially cause system instability or complete service disruption.
From a technical perspective, the vulnerability operates through the hypervisor's handling of privileged guest user inputs, where the Hyper-V host fails to implement adequate validation checks before processing received data. This represents a classic weakness in input sanitization and validation that falls under the Common Weakness Enumeration category of CWE-20, which specifically addresses "Improper Input Validation." The flaw allows an attacker with access to a guest operating system to craft malicious inputs that, when processed by the host hypervisor, can trigger unexpected behavior leading to system crashes or resource exhaustion. The vulnerability's impact is particularly concerning because it operates at the hypervisor level, meaning successful exploitation can affect all virtual machines hosted on the compromised system.
The operational impact of CVE-2017-0178 extends beyond simple service disruption to encompass broader security implications within virtualized environments. When exploited, the vulnerability can cause complete system hangs or forced reboots of the Hyper-V host, effectively terminating all running virtual machines and disrupting business operations. This type of denial of service attack directly violates the availability principles of the CIA triad and can be particularly devastating in enterprise environments where multiple critical workloads depend on virtualized infrastructure. The vulnerability's presence across multiple Windows versions indicates a widespread exposure that affects both desktop and server deployments, making it a high-priority target for attackers seeking to compromise virtualized environments.
Mitigation strategies for CVE-2017-0178 should focus on both immediate patch deployment and operational security enhancements. Microsoft released security updates that address the input validation gaps in Hyper-V's processing mechanisms, and organizations should prioritize immediate deployment of these patches across all affected systems. Additionally, implementing network segmentation and access controls to limit guest user privileges can reduce the attack surface, though this approach provides only partial protection given that the vulnerability specifically targets privileged guest users. Organizations should also consider implementing monitoring solutions that can detect unusual patterns in hypervisor resource usage or unexpected system behavior that might indicate exploitation attempts. The vulnerability's relationship to the ATT&CK framework's privilege escalation and denial of service tactics underscores the need for comprehensive defensive measures including endpoint detection and response capabilities to identify and contain potential exploitation activities.