Description Preview
A vulnerability in QEMU's implementation of VMWare's paravirtual RDMA device was discovered. When handling the "PVRDMA_CMD_CREATE_MR" command, improper memory remapping (mremap) occurs, which can be exploited by a malicious guest to crash the QEMU process running on the host system. This vulnerability primarily impacts system availability as it enables a denial of service attack from the guest against the host.
Overview
CVE-2021-3582 is a buffer overflow vulnerability (CWE-119) in QEMU's implementation of VMWare's paravirtual RDMA device. The flaw specifically occurs during the processing of the "PVRDMA_CMD_CREATE_MR" command, where improper memory remapping operations can be triggered by a guest operating system. When exploited, this vulnerability allows a malicious guest to crash the QEMU process on the host, resulting in a denial of service condition. This vulnerability primarily threatens system availability by allowing guests to disrupt host operations.
Remediation
To address this vulnerability, system administrators should:
- Update QEMU to the latest version that contains the fix for CVE-2021-3582
- Apply vendor-specific patches as they become available
- If updates cannot be immediately applied, consider disabling the VMWare paravirtual RDMA device functionality if it is not required
- Ensure that only trusted guests are allowed to run on affected QEMU instances
- Monitor system logs for any unusual crashes in QEMU processes that might indicate exploitation attempts
References
- Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1966266
- Debian Security Advisory: https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- Gentoo Linux Security Advisory: https://security.gentoo.org/glsa/202208-27
- NetApp Security Advisory: https://security.netapp.com/advisory/ntap-20220429-0003/
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
- UtilitiesUtilities
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- Health Care & Social AssistanceHealth Care & Social Assistance
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Finance and InsuranceFinance and Insurance
- Educational ServicesEducational Services
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- Other Services (except Public Administration)Other Services (except Public Administration)
- Public AdministrationPublic Administration
- Transportation & WarehousingTransportation & Warehousing
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- ConstructionConstruction
- InformationInformation
- MiningMining
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- Wholesale TradeWholesale Trade
