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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 profits 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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