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AUSCERT External Security Bulletin Redistribution
ESB-2015.0593
SCADA Engine BACnet OPC Server Vulnerabilities
12 March 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: SCADA Engine BACnet OPS Server
Publisher: US-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0981 CVE-2015-0980 CVE-2015-0979
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-069-03
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Advisory (ICSA-15-069-03)
SCADA Engine BACnet OPC Server Vulnerabilities
Original release date: March 10, 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
Independent researcher Josep Pi Rodriguez has identified three vulnerabilities
in the SCADA Engine BACnet OPC Server application. SCADA Engine has produced a
new software version that mitigates these vulnerabilities. Josep Pi Rodriguez
has tested the new software version to validate that it resolves all three
vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following BACnet OPC Server versions are affected:
OPC Server prior to and including Version 2.1.359.22
IMPACT
The simple object access protocol (SOAP) web interface in the Windows Service
used in this product has directly contributed to all three vulnerabilities.
Arbitrary code execution is possible.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.
BACKGROUND
SCADA Engine is a Thailand-based company that maintains offices in Thailand.
The affected product, BACnet OPC Server, provides data access, alarms and
events, and historical data access between OPC clients and BACnet-compliant
devices.
The BACnet protocol was developed by the American Society of Heating,
Refrigerating, and Air-Conditioning Engineers (ASHRAE). According to SCADA
Engine, BACnet OPC Server is generally used for building automation and
control systems.
SCADA Engine estimates that these products are used globally.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
HEAP-BASED BUFFER OVERFLOW[a]
By sending a special packet to the BACnet OPS Server, it is possible to
trigger a heap corruption. This could allow the attacker to cause a crash or
to execute arbitrary code.
CVE-2015-0979[b] has been assigned to this vulnerability. A CVSS v2 base score
of 8.3 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:P/I:P/A:C).[c]
INPUT VALIDATION[d]
The BACnet OPC Server contains a format string vulnerability. Sending a
specially crafted request to BACnOPCSever.exe could possibly crash the
service. This could allow the attacker to execute arbitrary code.
CVE-2015-0980[e] has been assigned to this vulnerability. A CVSS v2 base score
of 7.8 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:P/I:N/A:C).[f]
AUTHENTICATION[g]
SCADA Engine Bacnet OPC Server has a vulnerability that allows an attacker to
insert, read, or delete any items in the database.
CVE-2015-0981[h] has been assigned to this vulnerability. A CVSS v2 base score
of 10 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:N/C:C/I:C/A:C).[i]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
SCADA Engine has developed and deployed a new software version, that can be
downloaded at this URL:
http:www.scadaengine.com/downloads/BACnetOPCServer_2.1.371.24.exe
This new version of software has removed the SOAP web interface in the Window
Service and replaced that with a proprietary communications protocol. In
addition, requests from other personal computers are blocked to prevent
attacks from another personal computer.
All installation and technical information requests should be sent to:
support@scadaengine.com
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 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-122: Heap-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/122.html, web site last accessed March
10, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0979, 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:C, web
site last accessed March 10, 2015.
d. CWE-20: Improper Input Validation,
http://cwe.mitre.org/data/definitions/20.html, web site last accessed March
10, 2015.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0980, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
f. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:N/A:C, web
site last accessed March 10, 2015.
g. CWE-287: Improper Authentication,
http://cwe.mitre.org/data/definitions/287.html, web site last accessed March
10, 2015.
h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0981, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
i. CVSS Calculator,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web
site last accessed March 10, 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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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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