[FD] ESA-2017-123: EMC Networker Remote Code Execution Vulnerability

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ESA-2017-123: EMC Networker Remote Code Execution Vulnerability

EMC Identifier: ESA-2017-123

CVE Identifier: CVE-2017-8023

Severity Rating: CVSSv3 Base Score: 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected products:
EMC NetWorker versions 8.2.x
EMC NetWorker versions 9.0.x
EMC NetWorker versions prior to 9.1.1.5
EMC NetWorker versions prior to 9.2.1


Summary:
EMC NetWorker includes an unauthenticated remote code execution vulnerability 
that may potentially be exploited by malicious users to compromise the affected 
system.

Details:
EMC NetWorker may potentially be vulnerable to an unauthenticated remote code 
execution vulnerability in the Networker Client execution service (nsrexecd) 
when oldauth authentication method is used. An unauthenticated remote attacker 
could send arbitrary commands via RPC service to be executed on the host system 
with the privileges of the nsrexecd service, which runs with administrative 
privileges.

Resolution:
               The following EMC NetWorker releases address this vulnerability:
EMC NetWorker 9.1.1.5
EMC NetWorker 9.2.1
EMC NetWorker 8.2.4.11

The two options below can be used as a workaround:

1. Use nsrauth exclusively and do not allow a fallback to oldauth.
2. For customers who must use oldauth, ensure all 'servers' files are properly 
configured and review the "Restricting remote program executions and 
client-tasking rights" section in the EMC NetWorker Security Configuration 
Guide for how to update the servers file.

EMC recommends all customers upgrade at the earliest opportunity. Oldauth is an 
insecure authentication mode and supported for compatibility purposes only. 
Customers are strongly recommended to use nsrauth exclusively in their 
environment. See EMC NetWorker Security Configuration Guides listed below for 
additional information:

https://support.emc.com/docu57698_NetWorker-8.2--Security-Configuration-Guide.pdf
https://support.emc.com/docu61097_NetWorker_9.0.x_Security_Configuration_Guide.pdf
https://support.emc.com/docu81539_NetWorker-9.1.x-Security-Configuration-Guide.pdf
https://support.emc.com/docu85867_NetWorker-9.2-Security-Configuration-Guide.pdf

Link to remedies:
Customers can download software from two different locations:

For EMC NetWorker version 9.1.1: 
https://support.emc.com/docu86749_NetWorker,-NVE,-NVP-and-Modules-9.1.1-Cumulative-Hotfixes.pdf
For EMC NetWorker version 9.2.1: 
https://support.emc.com/downloads/1095_NetWorker
For EMC NetWorker version 8.2.4.11: 
https://support.emc.com/docu81710_NetWorker-and-NMM-8.2.4-Cumulative-Hotfixes.pdf

Severity Rating:
For an explanation of Severity Ratings, refer to Dell EMC Knowledgebase article 
468307. Dell 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.

Legal Information:
Read and use the information in this Dell 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 Dell EMC Software 
Technical Support at 1-877-534-2867. Dell EMC distributes Dell EMC Security 
Advisories, in order to bring to the attention of users of the affected Dell 
EMC products, important security information. Dell 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. Dell 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 Dell EMC or its suppliers, be liable for any damages 
whatsoever including direct, indirect, incidental, consequential, loss of 
business profit
 s or spe
 cial damages, even if Dell 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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