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

[EMC Product Security Response Center <Security_Alert@xxxxxxx>]

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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 Operating Environment for File versions prior to 
8.1.9.155
EMC Software: EMC VNX1 Operating Environment for File versions prior to 7.1.80.3
EMC Software: EMC VNXe3200 Operating Environment prior to 3.1.5.8711957
EMC Software: EMC VNXe3100/3150/3300 Operating Environment prior to 2.4.4.22638
EMC Software: EMC Celerra (all supported versions)

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

Details:  
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 may 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).

Resolution:  

The following releases contain resolutions for this issue:

?EMC VNX2 Operating Environment for File 8.1.9.155


?EMC VNX1 Operating Environment for File 7.1.80.3


?EMC VNXe3200 Operating Environment 3.1.5.8711957


?EMC VNXe3100/3150/3300 Operating Environment 2.4.4.22638


Dell EMC recommends all customers upgrade at the earliest opportunity. There is 
currently no plan to release fixes for EMC Celerra based on the current support 
lifecycle of the product.

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



Link to remedies:

Registered EMC Support customers can download EMC VNX2, VNX1, and VNXe 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 
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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.

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