Description Preview
A vulnerability in Dell Isilon OneFS versions 8.2.2 and earlier and Dell EMC PowerScale OneFS version 9.0.0 involves improper default permissions in the Network File System (NFS) configuration. The default configuration allows access to the 'admin' home directory, which could be exploited by attackers who spoof a Unique Identifier (UID) over NFS to modify sensitive files and potentially gain administrative access to the system.
Overview
This vulnerability (CVE-2020-5353) is classified as CWE-276 (Incorrect Default Permissions). The issue stems from insufficient access controls in the default NFS configuration of affected Dell Isilon and PowerScale systems. When NFS is enabled with default settings, the 'admin' home directory becomes accessible to network users. An attacker with network access to the NFS service could exploit this vulnerability by spoofing a UID to match the admin user's UID, allowing them to modify critical system files. If successful, this attack could result in privilege escalation to administrative level access, potentially compromising the entire storage system and any data stored on it.
Remediation
To address this vulnerability, system administrators should:
- Update to the latest version of Dell Isilon OneFS or Dell EMC PowerScale OneFS that contains the security patch.
- If immediate patching is not possible, implement the following mitigations:
- Review and restrict NFS export configurations to limit access to sensitive directories
- Implement proper authentication mechanisms for NFS access
- Configure NFS to use more secure versions (NFSv4 with Kerberos if possible)
- Monitor system logs for suspicious NFS access attempts
- Follow Dell EMC's specific remediation guidance in KB article 542721.
- After applying patches, verify that the vulnerability has been addressed by testing NFS access controls.
References
- Dell EMC Knowledge Base Article: https://support.emc.com/kb/542721
- CWE-276: Incorrect Default Permissions - https://cwe.mitre.org/data/definitions/276.html
- NIST National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2020-5353
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.
- Management of Companies & EnterprisesManagement of Companies & Enterprises
- Accommodation & Food ServicesAccommodation & Food Services
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting
- Arts, Entertainment & RecreationArts, Entertainment & Recreation
- ConstructionConstruction
- Educational ServicesEducational Services
- Finance and InsuranceFinance and Insurance
- Health Care & Social AssistanceHealth Care & Social Assistance
- InformationInformation
- ManufacturingManufacturing
- MiningMining
- Other Services (except Public Administration)Other Services (except Public Administration)
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services
- Public AdministrationPublic Administration
- Real Estate Rental & LeasingReal Estate Rental & Leasing
- Retail TradeRetail Trade
- Transportation & WarehousingTransportation & Warehousing
- UtilitiesUtilities
- Wholesale TradeWholesale Trade
