CVE-2017-0185 in Hyper-V
Summary
by MITRE
A denial of service vulnerability exists when Microsoft Hyper-V Network Switch running on a Windows 10, Windows 8.1, Windows Server 2012, Windows Server 2012 R2, or 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-2017-0178, CVE-2017-0179, CVE-2017-0182, CVE-2017-0183, CVE-2017-0184, and CVE-2017-0186.
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Analysis
by VulDB Data Team • 12/23/2024
The CVE-2017-0185 vulnerability represents a critical denial of service flaw within Microsoft Hyper-V Network Switch functionality, specifically affecting Windows 10, Windows 8.1, and various Windows Server editions including 2012, 2012 R2, and 2016. This vulnerability stems from insufficient input validation mechanisms within the hypervisor's network switching components, creating a pathway for malicious actors to disrupt system operations. The flaw is particularly concerning because it operates through a privileged user context within guest operating systems, meaning that an attacker with access to a virtual machine could potentially leverage this weakness to compromise the host system's availability. The vulnerability specifically targets the Hyper-V Network Switch, which serves as the core networking component responsible for managing virtual network traffic between virtual machines and physical network interfaces.
The technical exploitation of this vulnerability occurs when a privileged user within a guest operating system submits malformed or improperly validated input to the Hyper-V Network Switch component. This input validation failure creates a condition where the network switch process fails to properly handle unexpected data structures or parameters, leading to system instability and ultimately resulting in a denial of service condition. The flaw is categorized under CWE-20, which represents "Improper Input Validation," and aligns with the ATT&CK framework's T1499.004 technique for "Endpoint Denial of Service" targeting virtualization platforms. The vulnerability demonstrates a classic privilege escalation pathway where guest-level access can be leveraged to affect host-level system availability, making it particularly dangerous in multi-tenant environments or cloud computing scenarios where isolation between virtual machines is paramount.
The operational impact of CVE-2017-0185 extends beyond simple service disruption, as it can potentially lead to complete system unavailability within virtualized environments. When exploited, the vulnerability may cause the Hyper-V Network Switch service to crash or become unresponsive, effectively cutting off network connectivity for all virtual machines hosted on the affected system. This disruption can cascade through entire data center operations, particularly in environments where multiple virtual machines depend on shared network resources or where automated failover mechanisms are triggered by network interruptions. The vulnerability's exploitation requires only a privileged user context within a guest operating system, making it accessible to attackers who have gained administrative access to virtual machines or who can exploit other vulnerabilities to achieve elevated privileges. Organizations running virtualized infrastructures are particularly at risk since the attack surface expands significantly when considering that virtual machines may be compromised through various attack vectors including phishing, malware, or unpatched applications.
Microsoft addressed this vulnerability through security updates that improved input validation mechanisms within the Hyper-V Network Switch component, ensuring that malformed inputs are properly rejected rather than processed in a manner that could cause system instability. The fix implemented by Microsoft aligns with industry best practices for secure coding and input sanitization, particularly emphasizing the importance of validating all inputs regardless of their source or perceived trust level. Organizations should prioritize applying these security updates as part of their vulnerability management processes, particularly in environments where virtualization is extensively used and where the potential for privilege escalation exists. The vulnerability also highlights the importance of network segmentation and access controls within virtualized environments, as limiting guest user privileges can reduce the attack surface for such hypervisor-level vulnerabilities. Additionally, implementing monitoring solutions that can detect unusual network behavior or service disruptions within virtualized environments can help identify potential exploitation attempts before they cause significant operational impact.