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AUSCERT External Security Bulletin Redistribution
ESB-2015.1600
Schneider Electric Wonderware System Platform Vulnerabilities
19 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Wonderware System Platform
Publisher: US-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-3940
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-02
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Advisory (ICSA-15-169-02)
Schneider Electric Wonderware System Platform Vulnerabilities
Original release date: June 18, 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 of WiseSecurity Team has identified a fixed search path
vulnerability in Schneider Electrics Wonderware InTouch, Application Server,
Historian, and SuiteLink applications, which are part of the Wonderware System
Platform suite. Schneider Electric has produced a patch that mitigates this
vulnerability. Ivan Sanchez has tested the patch to validate that it resolves
the vulnerability.
AFFECTED PRODUCTS
The following Schneider Electric products are affected:
Wonderware System Platform 2014 R2 and prior versions.
IMPACT
Successful exploitation of this vulnerability would require the victim to
install and execute malicious code that could result in arbitrary code
execution.
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.
According to Schneider Electric, the Wonderware System Platform, is deployed
across several sectors including Chemical, Commercial Facilities, Critical
Manufacturing, Energy, Food and Agriculture, and Water and Wastewater Systems.
Schneider Electric estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
UNCONTROLLED SEARCH PATH ELEMENT[a]
Successful exploitation of this vulnerability would require the local user to
load a malicious DLL that is called using a fixed search path at runtime,
which may allow an attacker to execute arbitrary code.
CVE-2015-3940[b] has been assigned to this vulnerability. A CVSS v2 base score
of 7.2 has been assigned; the CVSS vector string is
(AV:L/AC:L/Au:N/C:C/I:C/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 malicious 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 malicious file.
This decreases the likelihood of a successful exploit.
MITIGATION
Schneider Electric has released the Wonderware System Platform 2014 R2 Patch
01, which addresses multiple instances of the identified vulnerability.
Schneider Electric has identified the severity rating of this vulnerability as
high and recommends applying the patch as soon as possible.
Schneider Electrics Wonderware System Platform 2014 R2 Patch 01 is available
at the following URL:
https://gcsresource.invensys.com/tracking/ConfirmDownload.aspx?id=21913
Schneider Electrics security bulletin, LFSEC00000106, is located at the
following URL:
http://software.schneider-electric.com/support/cyber-security-updates/
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should consider the
following defensive measures:
Do not upload and run untrusted files without verifying the integrity of the
file.
Interact with, and only obtain files and software from trusted highly
reputable sources.
Where possible, create isolated accounts using lowest privileges to accomplish
minimum required tasks.
Restrict network and physical access to assets using the Wonderware System
Platform suite to authorized personnel.
Maintain layered physical and logical security to implement defense-in-depth
design practices for ICS.
Ensure that employees with access to the Wonderware System Platform suite are
aware of the ongoing potential for social engineering attacks and are trained
to identify and avoid social engineering attacks.
Use application whitelisting to detect and prevent files from executing if
they have not been approved. Application whitelisting will not prevent
memory-based attacks, such as exploiting buffer overflows vulnerabilities, but
it can prevent shell code from running executables that have not been
authorized.
Follow good network design practices that include network separation and
segmentation; use DMZs with properly configured firewalls to selectively
control and monitor traffic passed between zones and systems.
Minimize network exposure for all control system devices and/or systems, and
ensure that they are not accessible from the Internet.
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 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
(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-427: Uncontrolled Search Path Element,
http://cwe.mitre.org/data/definitions/427.html, web site last accessed June
18, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-3940, 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:L/Au:N/C:C/I:C/A:C, web
site last accessed June 18, 2015.
d. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed June 18, 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 June 18,
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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