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AUSCERT External Security Bulletin Redistribution
ESB-2016.1446
Trihedral VTScada Vulnerabilities
9 June 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Trihedral VTScada
Publisher: US-CERT
Operating System: Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4532 CVE-2016-4523 CVE-2016-4510
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-159-01
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Advisory (ICSA-16-159-01)
Trihedral VTScada Vulnerabilities
Original release date: June 07, 2016 | Last revised: June 08, 2016
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
An anonymous researcher has identified several vulnerabilities in Trihedral
Engineering Ltd.s Trihedral VTScada and reported them to Zero Day Initiative
(ZDI), which reported them to NCCIC/ICS-CERT. Trihedral Engineering Ltd. has
produced a new version to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
Trihedral Engineering Ltd. reports that these vulnerabilities affect the
following product:
VTScada versions after Version 8 and before Version 11.2.02
These vulnerabilities only apply to the WAP interface (typically Port
9201/TCP/IP). Only a small fraction of the installed base of VTScada uses this
legacy feature.
IMPACT
An attacker may exploit these vulnerabilities to download or view arbitrary
files, or to cause the server to crash and not come back without being
manually relaunched.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of these vulnerabilities based on their operational environment, architecture,
and product implementation.
BACKGROUND
Trihedral Engineering Ltd. is a Canada-based company that maintains offices in
the United States and the United Kingdom.
The affected product, VTScada (also known as VTS prior to 2013), is a
Windows-based SCADA system with a web interface option. According to Trihedral
Engineering Ltd, VTScada is deployed across Chemical, Critical Manufacturing,
Communications, Energy, Food and Agriculture, Transportation Systems, Water
and Wastewater Systems, and other sectors. Trihedral Engineering Ltd.
estimates that this product is used primarily in North America and Europe.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
OUT-OF-BOUNDS READ [a]
The software can be caused to read outside the intended buffer, causing a
crash.
CVE-2016-4523 [b] has been assigned to this vulnerability. A CVSS v3 base
score of 7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). [c]
PATH TRAVERSAL [d]
An attacker can replace the path in a request to retrieve any file.
CVE-2016-4532 [e] has been assigned to this vulnerability. A CVSS v3 base
score of 9.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). [f]
AUTHENTICATION BYPASS ISSUES [g]
The software does not properly authenticate requests to read arbitrary files.
CVE-2016-4510 [h] has been assigned to this vulnerability. A CVSS v3 base
score of 9.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). [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
Trihedral Engineering Ltd. has created an updated software version (version
11.2.02) to address these vulnerabilities. This software update is available
on Trihedral Engineering Ltd.s FTP site:
ftp://ftp.trihedral.com/VTS/
Help file notes for upgrading VTScada/VTS can be found at:
http://www.trihedral.com/help/#Op_Welcome/Wel_UpgradeNotes.htm
If you have any questions or any difficulties with installing one of these
updates, please call Trihedral Tech Support:
1-855-887-2232
1-902-835-1575
+44 (0) 1224 258910 for the United Kingdom
ICS-CERT recommends, as quality assurance, that users test the update in a
test development environment that reflects their production environment prior
to installation. In addition, users should:
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 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 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-125: Out-of-bounds Read,
http://cwe.mitre.org/data/definitions/125.html, web site last accessed June 7,
2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4523,
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,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed June 7, 2016.
d. CWE-22: Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal'), http://cwe.mitre.org/data/definitions/22.html, web site
last accessed June 7, 2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4532,
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,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed June 7, 2016.
g. CWE-592: Authentication Bypass Issues,
http://cwe.mitre.org/data/definitions/592.html, web site last accessed June 7,
2016.
h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4510,
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,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed June 7, 2016.
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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