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AUSCERT External Security Bulletin Redistribution
ESB-2015.0457
Schneider Electric Invensys Positioner Buffer Overflow Vulnerability
26 February 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Invensys Positioner
Publisher: US-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-9206
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-055-03
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Advisory (ICSA-15-055-03)
Schneider Electric Invensys Positioner Buffer Overflow Vulnerability
Original release date: February 24, 2015
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
Ivan Sanchez from Nullcode Team has identified a buffer overflow security
vulnerability in the DTM (Device Type Manager) software for Schneider
Electrics Invensys SRD Control Valve Positioner product line. Schneider
Electric has produced a new version that mitigates this vulnerability.
AFFECTED PRODUCTS
The following Schneider Electric products are affected:
DTM Version 3.1.6 and all previous versions used with SRD 960 and SRD 991
Control Valve Positioners.
IMPACT
An attacker who exploits this vulnerability may be able to execute arbitrary
code.
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
Schneider Electrics corporate headquarters is located in Paris, France, and
maintains offices in more than 100 countries worldwide.
The affected products, SRD 960 and SRD 991 Control Valve Positioners, operate
pneumatic valve actuators. According to Schneider Electric, these products are
deployed across several sectors including Critical Manufacturing, Energy,
Water and Wastewater Systems, and others. Schneider Electric estimates that
these products are used globally.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
STACK-BASED BUFFER OVERFLOW [a]
The vulnerability identified includes a stack buffer overflow condition in a
DLL file that could possibly result in remote code execution.
CVE-2014-9206 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 5.2 has been assigned; the CVSS vector string is
(AV:L/AC:H/Au:N/C:P/I:P/A:C). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability is not exploitable remotely and cannot be exploited without
user interaction. The exploit is only triggered when a local user runs the
vulnerable application and loads the malformed DLL file.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
Crafting a working exploit for this vulnerability would be difficult. Social
engineering is required to convince the user to accept the malformed DLL file.
Additional user interaction is needed to load the malformed file. This
decreases the likelihood of a successful exploit.
MITIGATION
Schneider Electric encourages customers using these products to download the
latest version, V3.6.3, that mitigates this vulnerability. It can be found at
the bottom of the following web site:
http://www.foxboro-eckardt.eu/download/FDT-DTMselector.html
Schneider Electrics security notice SEVD-2015-050-01 is available at the
following location:
http://download.schneider-electric.com/files?p_File_Id=740491624&p_File_Name=SEVD-2015-050-01.pdf
ICS-CERT encourages asset owners to take additional defensive measures to
protect against this and other cybersecurity risks.
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 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.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
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.
In addition, ICS-CERT recommends that users take the following measures to
protect themselves from social engineering attacks:
Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams [d] for more information on
avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks [e] for more
information on social engineering attacks.
a. CWE-121: Stack-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/121.html, web site last accessed
February 24, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9206,
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,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:L/AC:H/Au:N/C:P/I:P/A:C, web
site last accessed February 24, 2015.
d. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed February 24, 2015.
e. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed February
24, 2015.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
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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