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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.1753
  Schneider Electric SoMachine HVAC Unsafe ActiveX ControL Vulnerability
                               15 July 2016

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

Product:           Schneider Electric SoMachine
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-4529  

Original Bulletin: 
   http://ics-cert.us-cert.gov/advisories/ICSA-16-196-03

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Advisory (ICSA-16-196-03)

Schneider Electric SoMachine HVAC Unsafe ActiveX ControL Vulnerability

Original release date: July 14, 2016

Legal Notice

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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

Andrea Micalizzi discovered an unsafe ActiveX control vulnerability in 
Schneider Electric SoMachine software. He reported this vulnerability to ZDI 
who then reported it to NCCIC/ICSCERT. Schneider Electric has produced a patch
to mitigate this vulnerability.

This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

Schneider Electric reports that the vulnerability affects the following 
products:

SoMachine HVAC-Application Version 2.0.2 and previous.

IMPACT

An exploitation of this vulnerability may allow an attacker to remotely 
execute arbitrary code.

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

BACKGROUND

Schneider Electrics corporate headquarters is located in Paris, France, and it
maintains offices in more than 100 countries worldwide.

The affected product, SoMachine, is software for developing, configuring, and
commissioning a machine in a single software environment, including logic, 
motion control, HMI, and related network automation functions. According to 
Schneider Electric, SoMachine is deployed in the Commercial Facilities sector.
Schneider Electric estimates that this product is used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

UNSAFE ACTIVEX CONTROL MARKED SAFE-FOR-SCRIPTING [a]

An ActiveX control is intended for restricted use, but it has been marked as 
safe-for-scripting.

CVE-2016-4529 [b] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). [c]

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

An attacker with a low skill would be able to exploit this vulnerability.

MITIGATION

Schneider Electric has released a patch that resolves the vulnerability. 
Schneider Electrics patch is available at the following location:

http://www.schneider-electric.com/ww/en/download/document/SoMachine%20HVAC%20-%20Programming%20Software%20for%20Modicon%20M171-M172%20Logic%20Controllers
(link is external)

Schneider Electrics security notice SEVD-2016-161-01 is available at the 
following location:

http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2016-161-01 (link
is external)

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 at: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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 ICSCERT 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 
(http://ics-cert.us-cert.gov/).

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-623: Unsafe ActiveX Control Marked Safe For Scripting, 
http://cwe.mitre.org/data/definitions/623.html , web site last accessed July 
14, 2016.

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4529, 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:N/AC:L/PR:N/UI:N/S... ,
web site last accessed July 14, 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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