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AUSCERT External Security Bulletin Redistribution
ESB-2015.1388
Schneider Electric OFS Server Vulnerability
26 May 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric OFS Server
Publisher: US-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1014
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-141-01
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Advisory (ICSA-15-141-01)
Schneider Electric OFS Server Vulnerability
Original release date: May 21, 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 DLL hijacking vulnerability
in Schneider Electrics OPC Factory Server (OFS) server application. Schneider
Electric has produced a new service patch that mitigates this vulnerability.
Ivan Sanchez has tested the new service patch to validate that it resolves the
vulnerability.
AFFECTED PRODUCTS
The following OPC Factory Server versions are affected:
OPC Factory Server Version 3.5, and older.
IMPACT
Exploitation of DLL hijack vulnerabilities can crash the system, and possibly
give an attacker access to the system with the same privilege level as the
application that utilizes the malicious DLL.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
potential impact of this vulnerability based on their operational environment
and architecture.
BACKGROUND
Schneider Electrics corporate headquarters is located in Paris, France, and it
maintains offices in more than 100 countries worldwide.
The affected product, OPC Factory Server, enables Windows client applications
to access Modicon PLC data in real time. According to Schneider Electric, OPC
Factory Server is deployed across many complex manufacturing processes and
infrastructures in many sectors including Commercial Facilities, Critical
Manufacturing, Energy, Water and Wastewater Systems, and others. Schneider
Electric estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
DLL HIJACKING [a]
A successful exploit of these vulnerabilities requires the local user to load
a crafted DLL file in the system directory on the victim machine. If the
application attempts to open that file, the application could crash or allow
the attacker to execute arbitrary code.
CVE-2015-1014 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 5.0 has been assigned; the CVSS vector string is
(AV:L/AC:M/Au:S/C:N/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 a specially crafted 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 click and access specially
malformed files necessary to exploit this vulnerability. Additional user
interaction is also needed to load additional malformed files. This decreases
the likelihood of a successful exploit.
MITIGATION
Schneider Electric recommends vulnerable users to upgrade the OPC Factory
Server to V3.5, SP 6. This new service patch can be downloaded from the
following URL:
http://www.schneider-electric.com/download/WW/EN/details/703716507-OPC-Factory-Server-V350---Service-Pack-6/?showAsIframe=true&reference=OFS_3_50_2911-(SP6)
Schneider Electrics security notice SEVD-2015-133-01 is available at the
following location:
http://www.schneider-electric.com/ww/en/download/document/SEVD-2015-133-01
ICS-CERT also 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.
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.
a. CWE-427: Uncontrolled Search Path Element,
http://cwe.mitre.org/data/definitions/427.html, web site last accessed May
21, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1014,
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:M/Au:S/C:N/I:P/A:C, web
site last accessed May 21, 2015.
d. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed May 21, 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 May 21,
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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