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ESA-2017-161: EMC Isilon OneFS NFS Export Security Setting Fallback Vulnerability 

EMC Identifier: ESA-2017-161

CVE Identifier: CVE-2017-14387 

Severity Rating: CVSS v3 Base Score: 4.8 (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)

Affected products:  
*  EMC Isilon OneFS 8.1.0.0
*  EMC Isilon OneFS 8.0.1.0 -- 8.0.1.1
*  EMC Isilon OneFS 8.0.0.0 - 8.0.0.4

Summary:  
EMC Isilon OneFS requires a security update to address an issue that may potentially allow NFS clients to access certain NFS exports using a weaker authentication flavor when default NFS export settings are modified. 

Details:  
OneFS NFS service maintains default NFS export settings (including NFS export security flavor for authentication) that can be leveraged by current and future NFS exports. OneFS NFS service contained a flaw that did not properly propagate changes made to the default security flavor to all new and existing NFS exports that are configured to use default NFS export settings and that are mounted after those changes are made. This flaw may potentially allow NFS clients to access affected NFS exports using the default and potentially weaker security flavor even if a more secure one was selected to be used by the OneFS administrator. 

Resolution:  
The following versions of EMC Isilon OneFS resolve this vulnerability:
*  EMC Isilon OneFS 8.1.0.1
*  EMC Isilon OneFS 8.0.1.2
*  EMC Isilon OneFS 8.0.0.5
EMC recommends that all customers upgrade to a version containing the resolution at the earliest opportunity. 

If you cannot upgrade at this time, you can perform the workaround below.  

Workaround:
After you create or modify an export, and before you mount that export, manually refresh the exports by running either of the following commands:

isi nfs exports reload 

or

/usr/likewise/bin/lwsm refresh nfs

Link to remedies:

Registered EMC Online Support customers can download OneFS installation files from the Downloads for Isilon OneFS page of the EMC Online Support site at https://support.emc.com/downloads/15209_Isilon-OneFS. 

If you have any questions, please contact EMC Support.


[The following is standard text included in all security advisories.  Please do not change or delete.]

Read and use the information in this EMC Security Advisory to assist in avoiding any situation that might arise from the problems described herein. If you have any questions regarding this product alert, contact EMC Software Technical Support at 1-877-534-2867.

For an explanation of Severity Ratings, refer to EMC Knowledgebase solution emc218831. EMC recommends all customers take into account both the base score and any relevant temporal and environmental scores which may impact the potential severity associated with particular security vulnerability.

EMC Corporation distributes EMC Security Advisories, in order to bring to the attention of users of the affected EMC products, important security information. EMC recommends that all users determine the applicability of this information to their individual situations and take appropriate action. The information set forth herein is provided "as is" without warranty of any kind. EMC disclaims all warranties, either express or implied, including the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event, shall EMC or its suppliers, be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if EMC or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages, so the foregoing limitation may not apply.



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