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ESA-2016-096: EMC Celerra, VNX1, VNX2 and VNXe SMB NTLM Authentication Weak Nonce Vulnerability

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ESA-2016-096: EMC Celerra, VNX1, VNX2 and VNXe SMB NTLM Authentication Weak Nonce Vulnerability

EMC Identifier: ESA-2016-096
CVE Identifier: CVE-2016-0917
Severity Rating: CVSS v3 Base Score: 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected products:  
EMC Software: EMC VNX2 File OE versions prior to
EMC Software: EMC VNX1 File OE versions prior to
EMC Software: EMC VNXe (all supported versions)
EMC Software: EMC Celerra (all supported versions)Note: EMC Unity (all versions) is not affected by this issue.

SMB implementation in EMC Celerra, VNX1, VNX2 and VNXe are affected by an NTLM authentication weak nonce vulnerability that could potentially be exploited by malicious users to compromise the affected system. 

An unauthenticated remote attacker may potentially exploit the NTLM challenge-response authentication protocol causing the server to generate duplicate challenges/nonces to potentially access the SMB service of the target system under the credentials of an authorized user. Depending on the privileges of the user, the attacker will be able to obtain and modify files on the target system and execute arbitrary code. This issue is similar to the Microsoft Windows SMB implementation issue that is described under CVE-2010-0231 (https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-0231).  

The following releases contain resolutions for this issue:
- -	EMC VNX2 File OE versions
- -	EMC VNX1 File OE versions

EMC recommends all customers upgrade at the earliest opportunity. This advisory will be updated when fixes for EMC VNXe will be available.  There is currently no plan to release fixes for EMC Celerra based on the current support lifecycle of the product. 

Customers that are unable to upgrade should use Kerberos authentication instead of NTLM.  

Link to remedies:

Registered EMC Support customers can download EMC VNX2 and VNX1 software from the EMC Online Support web site at https://support.emc.com.

[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 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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