CVE-2017-0163 in Hyper-V
Summary
by MITRE
A remote code execution vulnerability exists when Windows Hyper-V Network Switch running on a host server fails to properly validate input from an authenticated user on a guest operating system, aka "Hyper-V Remote Code Execution Vulnerability." This CVE ID is unique from CVE-2017-0162, CVE-2017-0180, and CVE-2017-0181.
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Analysis
by VulDB Data Team • 11/28/2022
The vulnerability identified as CVE-2017-0163 represents a critical remote code execution flaw within Microsoft Windows Hyper-V virtualization infrastructure. This security weakness specifically affects the Hyper-V Network Switch component that operates on host servers, creating a pathway for malicious actors to execute arbitrary code remotely. The vulnerability stems from insufficient input validation mechanisms within the network switch functionality, which processes data flows between virtual machines and physical network interfaces. When a guest operating system sends malformed or malicious input to the Hyper-V Network Switch, the system fails to properly sanitize or validate this data before processing it, potentially allowing attackers to exploit this gap in validation logic.
The technical flaw manifests in the improper handling of network packets and data structures within the Hyper-V Network Switch module. This component is responsible for managing virtual network traffic between virtual machines and external networks, making it a critical element in virtualized environments. The vulnerability occurs because the network switch does not adequately validate the format, size, or content of incoming data from guest operating systems, particularly when these inputs are processed through network virtualization layers. Attackers can leverage this weakness by crafting specific network packets or data sequences that, when processed by the vulnerable Hyper-V Network Switch, trigger memory corruption or execution flow manipulation. This flaw falls under the CWE-20 category of "Improper Input Validation" and represents a classic buffer overflow scenario where malformed input can overwrite memory locations and potentially redirect program execution.
The operational impact of CVE-2017-0163 extends beyond simple remote code execution, as it provides attackers with a foothold for broader system compromise within virtualized environments. Organizations running Hyper-V infrastructure are particularly at risk since this vulnerability can be exploited from outside the host system, requiring only network access to the virtualized environment. The attack surface includes any system running Hyper-V with virtual machines that have network connectivity, making it a significant concern for data centers, cloud providers, and enterprise environments. Once exploited, the vulnerability allows attackers to execute code with the privileges of the Hyper-V service account, potentially enabling lateral movement within the network, privilege escalation, and access to sensitive data stored across multiple virtual machines. This vulnerability aligns with ATT&CK technique T1059.007 for remote code execution and T1068 for exploit for privilege escalation, demonstrating how this flaw can be leveraged as a stepping stone for more extensive attacks.
Mitigation strategies for CVE-2017-0163 require immediate patching of affected systems through Microsoft's security updates, as the vulnerability was addressed in the July 2017 security bulletin. Organizations should implement network segmentation and access controls to limit guest operating system capabilities and reduce the attack surface available to potential exploit attempts. Additionally, monitoring network traffic for unusual patterns and implementing intrusion detection systems can help identify exploitation attempts before they succeed. Security teams should also consider disabling unnecessary virtual network features and implementing strict virtual machine network policies to prevent guest systems from sending potentially malicious data to the host. The vulnerability's classification under CWE-20 and its exploitation patterns align with common virtualization security best practices, emphasizing the importance of maintaining up-to-date virtualization infrastructure and implementing comprehensive security monitoring for virtual environments. Organizations should also conduct regular vulnerability assessments focusing on virtualization components to identify similar weaknesses in their infrastructure.