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AUSCERT External Security Bulletin Redistribution
ESB-2014.1664
Yokogawa CENTUM and Exaopc Vulnerability
25 September 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: Yokogawa CENTUM
Yokogawa Exaopc
Publisher: US-CERT
Operating System: Windows
Impact/Access: Create Arbitrary Files -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2014-5208 CVE-2014-0784
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-14-260-01
Comment: Exploits that target this vulnerability are publicly available.
While not patches are currently available, Yokogawa will provide
patch software for the latest revisions of the affected products at
the end of September 2014. In the meantime, administrators should
restrict network access to the device as detailed within this
advisory to mitigate the risk associated with this vulnerability.
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Advisory (ICSA-14-260-01)
Yokogawa CENTUM and Exaopc Vulnerability
Original release date: September 17, 2014
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
Tod Beardsley of Rapid7 Inc., and Jim Denaro of CipherLaw, have identified an
authentication vulnerability and released proof-of-concept (exploit) code for
the Yokogawa CENTUM CS 3000 series and Exaopc products. JPCERT and Yokogawa
have mitigated this vulnerability.
This vulnerability could be exploited remotely. Exploits that target this
vulnerability are known to be publicly available.
AFFECTED PRODUCTS
The following Yokogawa CENTUM 3000 versions are affected:
CENTUM series with the Batch Management Packages installed
CENTUM CS 3000 (R3.09.50 or earlier)
CENTUM CS 3000 Small (R3.09.50 or earlier)
CENTUM VP (R4.03.00 or earlier, R5.04.00 or earlier)
CENTUM VP Small (R4.03.00 or earlier, R5.04.00 or earlier)
CENTUM VP Basic (R4.03.00 or earlier, R5.04.00 or earlier).
The following Yokogawa Exaopc version is affected:
Exaopc (R3.72.10 or earlier).
IMPACT
Successful exploitation of this vulnerability could allow an attacker to allow
arbitrary files to be read and written.
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
Yokogawa is a company based in Japan that maintains offices in several
countries around the world, including North and Central America, South
America, Europe, the Middle East, Africa, South Asia, and East Asia.
The affected products, CENTUM CS 3000, are Windows-based control systems.
According to Yokogawa, these products are deployed across several sectors,
including Critical Manufacturing, Energy, Food and Agriculture, and others.
Yokogawa estimates that there are 7,600 systems worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
IMPROPER AUTHENTICATION [a]
CENTUMs BKBCopyD.exe service is started if the Batch Management Packages are
installed and listens by default on Port 20111/TCP. There is a no
authentication, which makes it possible to abuse several operations provided
by the service in order to:
Leak the CENTUM project database location
Read arbitrary files
Write arbitrary files.
This vulnerability is different than CVE-2014-0784, which was reported earlier
in March 2014.
CVE-2014-5208 [b] has been assigned to this vulnerability. Yokogawa has scored
this vulnerability with a CVSS v2 base score of 6.8; the CVSS v2 vector string
is AV:N/AC:M/Au:N/C:P/I:P/A:P. [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
Exploits that target this vulnerability are publicly available.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
Yokogawa will provide patch software for the latest revisions of the affected
products at the end of September 2014. Please contact Yokogawa technical
support and services for the details on the release date and installation
questions.
Yokogawa also suggests all customers introduce appropriate security measures
to the overall system, not just for the vulnerability identified.
For more information, please see Yokogawa Security Advisory Report
YSAR-14-0003E, published on September 17, 2014. This report is available at:
http://www.yokogawa.com/dcs/security/ysar/dcs-ysar-index-en.htm.
Yokogawa also recommends the following firewall mitigation measures:
Block external data communications from outside of the control system
network on Port 20111/TCP
Allow internal traffic on Port 20111/TCP only for the CENTUM systems
installed with Batch Management Packages
Block the traffic on Port 20111/TCP to Exaopc installations.
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.
a. CWE-287: Improper Authentication,
http://cwe.mitre.org/data/definitions/287.html, web site last accessed
September 17, 2014.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-5208,
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:N/AC:M/Au:N/C:P/I:P/A:P...,
web site last accessed September 17, 2014.
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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