CVE-2017-0168 in Hyper-V
Summary
by MITRE
An information disclosure vulnerability exists when the Windows Hyper-V Network Switch running on a Windows 8.1, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, or Windows Server 2012 R2 host operating system fails to properly validate input from an authenticated user on a guest operating system, aka "Hyper-V Information Disclosure Vulnerability." This CVE ID is unique from CVE-2017-0169.
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Analysis
by VulDB Data Team • 11/28/2022
The CVE-2017-0168 vulnerability represents a critical information disclosure flaw within Microsoft Windows Hyper-V virtualization infrastructure, specifically affecting the Hyper-V Network Switch component. This vulnerability manifests when the virtual network switch fails to properly validate input parameters provided by authenticated users within guest operating systems, creating a potential pathway for unauthorized data exposure. The affected systems include Windows 8.1, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2 operating systems, all of which rely on the Hyper-V Network Switch for virtual network communication management. The vulnerability is particularly concerning because it operates at the hypervisor level where guest operating systems have elevated privileges and can potentially exploit this weakness to access sensitive information from other virtual machines or the host system itself. This flaw falls under the CWE-20 category of "Improper Input Validation," which is a fundamental security principle that requires proper sanitization and validation of all external inputs to prevent various forms of exploitation. The vulnerability's classification aligns with the ATT&CK framework's T1059.001 technique for command and scripting interpreter, as malicious actors could potentially leverage this information disclosure to gain further system access and escalate privileges. The root cause of this vulnerability stems from insufficient validation of network packet data and configuration parameters that guest operating systems can send to the Hyper-V Network Switch, allowing crafted inputs to bypass security checks and potentially expose internal system information.
The operational impact of CVE-2017-0168 extends beyond simple information disclosure, as it can enable attackers to extract sensitive data that may include network configuration details, virtual machine metadata, or other system information that could be used in subsequent attacks. When an authenticated attacker within a guest operating system successfully exploits this vulnerability, they may be able to access information that should remain isolated within the virtualized environment, potentially leading to cross-vm information leakage or even host-level data exposure. This type of vulnerability is particularly dangerous in multi-tenant environments such as cloud computing platforms or shared hosting services where multiple customers operate virtual machines on the same physical infrastructure. The vulnerability could enable attackers to discover network topology information, identify running services, or extract configuration details that would otherwise remain confidential. Additionally, the information disclosed could be used to plan more sophisticated attacks, such as network reconnaissance or targeted exploitation of other vulnerabilities within the same virtualized environment. The exploitation of this vulnerability typically requires an authenticated user context within a guest operating system, meaning that attackers must first gain access to a virtual machine before they can attempt to leverage this specific flaw. This characteristic makes the vulnerability somewhat less severe than those requiring unauthenticated access, but still poses significant risks in environments where guest isolation is critical for security.
Mitigation strategies for CVE-2017-0168 should focus on both immediate patching and operational security measures to reduce the attack surface. Microsoft released security updates that address this vulnerability through proper input validation within the Hyper-V Network Switch component, requiring system administrators to apply these patches promptly to all affected systems. Organizations should also implement network segmentation and monitoring to detect anomalous network behavior that might indicate exploitation attempts. The principle of least privilege should be enforced within virtualized environments, limiting the capabilities of guest operating systems to prevent them from sending potentially malicious inputs to the hypervisor. Additionally, implementing network access controls and monitoring for unusual traffic patterns can help identify exploitation attempts before they succeed. From a compliance perspective, this vulnerability relates to standards such as NIST SP 800-53 and ISO 27001, which emphasize the importance of input validation and information access control. System administrators should also consider implementing virtual machine isolation techniques, such as using separate virtual networks for different security domains, to limit the potential impact of any successful exploitation. The vulnerability highlights the importance of maintaining up-to-date security patches across all virtualization infrastructure components and demonstrates the critical need for continuous security monitoring in virtualized environments. Regular security assessments and penetration testing of virtualized infrastructures should include evaluation of hypervisor security controls to identify and remediate similar vulnerabilities before they can be exploited by malicious actors.