Description Preview
A denial of service vulnerability (CVE-2020-0904) exists in Microsoft Hyper-V where the host server fails to properly validate specific malicious data from a user on a guest operating system. An attacker with privileged access to a guest OS could execute a specially crafted application to trigger this vulnerability, potentially causing the Hyper-V host to become unresponsive or crash.
Overview
This vulnerability (CWE-20: Improper Input Validation) affects Microsoft Hyper-V virtualization systems. When Hyper-V fails to properly validate input from guest operating systems, an attacker with privileged access to a guest virtual machine could send specially crafted data to the hypervisor. Successful exploitation could allow the attacker to cause the Hyper-V host server to stop responding or crash, resulting in denial of service for all virtual machines running on that host. This vulnerability does not allow for code execution or privilege escalation on the host, but the impact on availability could be significant in production environments where multiple VMs share the same host.
Remediation
To mitigate this vulnerability:
- Apply the security update provided by Microsoft through Windows Update or Microsoft Update Catalog.
- Ensure all Hyper-V hosts are patched with the latest security updates.
- Implement the principle of least privilege for guest VM access.
- Monitor Hyper-V hosts for unusual activity or performance issues.
- Consider implementing network segmentation to isolate Hyper-V management traffic.
- Ensure that only trusted users have privileged access to guest operating systems.
References
- Microsoft Security Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0904
- Common Weakness Enumeration (CWE): CWE-20 - Improper Input Validation
- Microsoft Security Response Center: https://msrc.microsoft.com/
- Microsoft Hyper-V Security Best Practices
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- ManufacturingManufacturing
- Health Care & Social AssistanceHealth Care & Social Assistance
- Public AdministrationPublic Administration
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Transportation & WarehousingTransportation & Warehousing
- Retail TradeRetail Trade
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- UtilitiesUtilities
- Other Services (except Public Administration)Other Services (except Public Administration)
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- InformationInformation
- Accommodation & Food ServicesAccommodation & Food Services
- ConstructionConstruction
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- MiningMining
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Wholesale TradeWholesale Trade
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
