Operating System:

[Win]

Published:

01 December 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2840
     Emerson DeltaV Easy Security Management Application Vulnerability
                              1 December 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Emerson DeltaV
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2016-9345  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-334-02

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Advisory (ICSA-16-334-02)

Emerson DeltaV Easy Security Management Application Vulnerability

Original release date: November 29, 2016

Legal Notice

All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security 
(DHS) does not provide any warranties of any kind regarding any information 
contained within. DHS does not endorse any commercial product or service, 
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For 
more information about TLP, see http://www.us-cert.gov/tlp/.

OVERVIEW

Emerson has released a publication to inform its users of a vulnerability that
affects DeltaV Easy Security Management. Emerson is terminating support for 
the DeltaV Easy Security Management application and highly recommends all 
users uninstall it from all DeltaV and non-DeltaV workstations.

AFFECTED PRODUCTS

Emerson reports that the vulnerability affects the DeltaV Easy Security 
Management application, which is present on the following systems:

DeltaV V12.3,

DeltaV V12.3.1, and

DeltaV V13.3

IMPACT

Successful exploitation of this vulnerability could allow a local attacker to
elevate privileges within a DeltaV control system.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the 
impact of this vulnerability based on their operational environment, 
architecture, and product implementation.

BACKGROUND

Emerson is a US-based company that maintains offices in several countries 
around the world, including the US, UK, Netherlands, Italy, India, Germany, 
France, Czech Republic, China, and Australia.

The affected product, DeltaV Easy Security Management, is an application 
included with DeltaV systems v12.3, v12.3.1, and v13.3 that manages the 
portable media ports and autorun feature for all DeltaV workstations and 
servers. The DeltaV Easy Security management application allows users to 
disable portable USB storage devices and autorun on workstations and servers 
in the DeltaV network. According to Emerson, DeltaV is deployed across several
sectors including Chemical and Energy. Emerson estimates that this product is
used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

IMPROPER PRIVILEGE MANAGEMENT[a]

Critical vulnerabilities may allow a local attacker to elevate privileges 
within the DeltaV control system.

CVE-2016-9345[b] has been assigned to this vulnerability. A CVSS v3 base score 
of 6.8 has been assigned; the CVSS vector string is 
(AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L).[c]

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability is not exploitable remotely and cannot be exploited without
user interaction.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

Crafting a working exploit for this vulnerability would be difficult.

MITIGATION

The DeltaV Easy Security Management server and monitoring agents can be 
manually uninstalled by users with privileges to install/uninstall Windows 
applications on each given workstation or server. A more detailed procedure to
uninstall the DeltaV Easy Security application is available in the Emersons 
Knowledge Base Article # NK-1600-0336 through Emersons Guardian Support 
Knowledge Base. Simplified steps are as follows:

1) Log into each one of the workstations/servers running DeltaV Easy Security
and launch Windows Programs and Features.

2) Uninstall the Easy Security Server and Agent application using the 
uninstall button.

A computer reboot is not required to complete these steps. The built-in user 
account created during the DeltaV Easy Security installation is also removed 
during the uninstall process.

Emerson will provide additional details explaining how to manage USB ports and
autorun features using Windows Group Policies in the near future as part of 
another Knowledge Base Article to be published through Emersons Guardian 
Support Knowledge Base.

ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:

Minimize network exposure for all control system devices and/or systems, and 
ensure that they are not accessible from the Internet.

Locate control system networks and remote devices behind firewalls, and 
isolate them from the business network.

When remote access is required, use secure methods, such as Virtual Private 
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize that VPN is only
as secure as the connected devices.

ICS-CERT reminds organizations to perform proper impact analysis and risk 
assessment prior to deploying defensive measures.

ICS-CERT also provides a section for control systems security recommended 
practices on the ICS-CERT web page. Several recommended practices are 
available for reading and download, including Improving Industrial Control 
Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly 
available in the ICS-CERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation 
Strategies, that is available for download from the ICS-CERT web site.

Organizations observing any suspected malicious activity should follow their 
established internal procedures and report their findings to ICS-CERT for 
tracking and correlation against other incidents.

a. CWE-269: Improper Privilege Management, 
https://cwe.mitre.org/data/definitions/269.html, web site last accessed 
November 29, 2016.

b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9345, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

c. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:H/PR:H/UI:N/S..., 
web site last accessed November 29, 2016.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

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